T Maxx 3.3 Owners Manual Tmaxx33_own_man Tmaxx33 Own Man

User Manual: tmaxx33_own_man

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MODEL 4909

owners manual

Thank you for purchasing a Traxxas T-Maxx 3.3 Nitro Monster Truck.

T-Maxx is legendary for providing the perfect balance of size, speed, power

and agility. With the new T-Maxx 3.3, we’ve turned that balance upside

down with mind-boggling, over-the-top horsepower. Chances are you’ve

never driven anything like this before.

Just how powerful is the new T-Maxx 3.3? The wheelie bar is mandatory

installed equipment! The TRX 3.3 delivers brutal bottom-end torque for

amazing wheel-standing launches along with hard-charging acceleration

that is second to none. Hammer the throttle at any speed and the T-Maxx

responds like a caged animal that’s been unleashed for destruction.

The T-Maxx 3.3 is without question the highest performance T-Maxx

ever made!

Your T-Maxx 3.3 combines automatic, two-speed shifting in forward

and reverse, with powerful four-wheel disc braking. The patent pending

transmission design and three-channel TQ-3 radio system put these

functions right at your fingertips.

The new TRX 3.3 Racing Engine is the most powerful engine of its size ever

available in a Ready-To-Run truck. Advanced engineering and design,

along with thousands of hours of testing, puts the TRX 3.3 in a class by

itself. Each part of the TRX 3.3 - from the air filter on the slide carburetor, to

the tip on the dyno-tuned exhaust system - has been carefully engineered

to provide maximum power over the broadest

rpm range.

T-Maxx 3.3 is equipped with the patent pending Optidrive™electronic

transmission control. Advanced electronic reduce the number of moving

parts inside the transmission for less weight, smooth engagement and

efficient performance.

Traxxas was the first with standard on-board electric starting. The

EZ-Start has evolved into an incredibly advanced and reliable starting

solution, featuring thermal protection for the motor and built-in

diagnostics to monitor the condition of the glow plug.

We know you’re excited about getting your new T-Maxx 3.3 on the

road, but it’s very important that you take some time to read through

the Owners Manual. This manual contains all the necessary set-up,

break-in, tuning, and operating procedures that allow you to unlock

the incredible performance and adjustment potential that Traxxas

engineers designed into T-Maxx 3.3. Even if you are an experienced

R/C enthusiast, it’s important to read and follow the procedures in

this manual. T-Maxx 3.3 contains new technologies in the engine,

suspension, and transmission operation that you may not be familiar

with. Pay particular attention to the fuel and break-in requirements

for the engine. The advanced design of the T-Maxx 3.3 Racing Engine

has a special break-in procedure that has been developed and

proven to produce the best-performing engine possible. Using

traditional or old-fashioned procedures could reduce engine

performance and longevity.

T-Maxx 3.3 is made to be a complete package that starts with the

highest level of engineering; a professionally produced DVD to

acquaint you with the starting, racing, and maintenance procedures;

and is equipped stock with the most powerful Ready-To-Race® engine

available. We want you to feel confident that you own the best-

performing truck in the market and that it is backed by a team of

professionals who aim to provide the highest level of factory support

possible. T-Maxx 3.3 is about experiencing total performance and

satisfaction, not just with your truck, but also with the company that

stands behind it.

Thank you again for going with Traxxas. We work hard every day to

assure you the highest level of customer satisfaction possible. We truly

want you to enjoy your new T-Maxx 3.3!

2•T-MAXX 3.3

Before You

Proceed

Safety

Precautions

Tools, Supplies

and Required

Equipment

Anatomy of Your

T-Maxx 3.3

Quick Start:

Getting Up to

Speed

Gluing the Tires

and Decorating

Your T-Maxx 3.3

The Traxxas

TQ-3 Radio

System

The TRX 3.3

Racing Engine

Driving

Your T-Maxx 3.3

Tuning

Adjustments

Maintaining

and Storing

Your T-Maxx 3.3

Troubleshooting

Index

Introduction

Traxxas Support

Traxxas support is with you every step of the way.

Refer to the next page to find out how to contact

us and what your support options are.

Quick Start

This manual is designed with a Quick Start path

that covers only the necessary procedures to get your model

up and running in the shortest time possible. If you are

experienced with Traxxas products you will find it helpful and

fast. Be sure and read through the rest of the manual to learn

about important safety, maintenance, and adjustment

procedures. Turn to page 7 to begin the Quick Start path.

T-MAXX 3.3 •3

Carefully read and follow all instructions in this and any accompanying

materials to prevent serious damage to your T-Maxx 3.3. Failure to follow

these instructions will be considered abuse and/or neglect.

Before running your T-Maxx 3.3, look over this entire manual and

examine the truck carefully. If for some reason you decide the T-Maxx 3.3

is not what you wanted, then do not continue any further. Your hobby

dealer absolutely cannot accept a T-Maxx 3.3 for return or exchange

after it has been run.

Warnings, helpful hints, & cross-references

Throughout this manual, you’ll notice warnings and helpful hints

identified by the icons below. Be sure to read them!

An important warning about personal safety or avoiding

damage to your T-Maxx 3.3 and related components.

Special advice from Traxxas to make things easier and more fun.

Refers you to a page with a related topic.

Support

If you have any questions about your T-Maxx 3.3 or its operation,

call the Traxxas Technical Support line toll-free at:

1-888-TRAXXAS (1-888-872-9927)*

Technical support is available Monday through Friday from 8:30 am

to 9:00 pm central time. Technical assistance is also available at

www.Traxxas.com. You may also e-mail customer support with your

question at support@Traxxas.com.Join hundreds of Traxxas R/C

enthusiasts in our online community at www.Traxxas.com.

Traxxas offers a full-service, on-site repair facility to handle any of

your Traxxas service needs. Maintenance, replacement parts, and

accessories may be purchased directly from Traxxas by phone or online

at www.BuyTraxxas.com. You can save time, along with shipping and

handling costs, by purchasing replacement parts from your local dealer.

Do not hesitate to contact us with any of your product support needs.

We want you to be thoroughly satisfied with your new T-Maxx 3.3!

Traxxas

1100 Klein Road

Plano, Texas 75074

Phone: 972-265-8000

Toll-free 1-888-TRAXXAS

Traxxas U.K.

P.O. Box 1128

Winterbourne, Bristol BS36-2SH

England

Phone: 44-117-956-1002

Internet

www.Traxxas.com

E-mail: support@Traxxas.com

Traxxas, Maxx, T-Maxx 3.3, TRX

3.3 Racing Engine, TQ-3, Top

Fuel, EZ-Start, Ready-To-Race,

Ready-To-Win, and ProGraphix

are trademarks or registered

trademarks of Traxxas. Other

brand names and marks are the

property of their respective

holders and are used only for

purposes of identification. No

part of this manual may be

reproduced or distributed in

print or electronic media without

the express written permission

of Traxxas.

Before You Proceed

*Toll-free support is available to U.S. residents only. Outside the U.S., call 972-265-8000.

4•T-MAXX 3.3

All of us at Traxxas want you to safely enjoy your new T-Maxx 3.3.

Operate your T-Maxx 3.3 sensibly and with care, and it will be exciting,

safe, and fun for you and those around you. Failure to operate your

T-Maxx 3.3 in a safe and responsible manner may result in property

damage and serious injury. The precautions outlined in this manual

should be strictly followed to help ensure safe operation. You alone

must see that the instructions are followed and the precautions are

adhered to.

Important Points to Remember

T-Maxx 3.3 is very fast! The T-Maxx 3.3 is intended for experienced

users with a high level of skill. The TRX 3.3 Racing Engine is extremely

powerful and may require skilled driving to maintain control. Children

under 16 years of age and inexperienced drivers should not operate

the T-Maxx 3.3 without the supervision of a responsible and

knowledgeable (experienced) adult.

Model engine fuel is dangerous and highly poisonous. Always

follow all directions and precautions printed on the fuel container.

Model engine fuel is poisonous to humans and animals. Drinking the

fuel can cause blindness and death. Handle with care and respect.

Model engine fuel, especially when in a fuel dispensing bottle, may

look like a cool drink to a child. Keep all fuel out of the reach of

children at all times. Do not place fuel containers on the ground

where children can reach them while you are driving.

Model engine fuel is flammable. Never allow smoking, sparks, heat or

flame in the presence of fuel or fuel vapors.

The engine, brakes, and exhaust system may become extremely hot

during use. Be careful not to touch the parts, especially when

refueling or stopping the engine.

Prolonged exposure to the engine exhaust can be harmful. Avoid

breathing the engine exhaust. Always run your T-Maxx 3.3 outdoors,

in a well-ventilated area. Never run the engine indoors.

Do not operate your T-Maxx 3.3 at night, or anytime your line of sight

to the model may be obstructed or impaired in any way.

Never operate your T-Maxx 3.3 in crowds of people or busy

pedestrian areas. T-Maxx 3.3 is very fast and could cause injury to

those unaware of its presence. Keep small children at a safe distance

away from the operating area.

Because T-Maxx 3.3 is controlled by radio, it is subject to radio

interference from many sources beyond your control. Since radio

interference can cause momentary loss of control, always allow a

safety margin in all directions around your model to prevent

collisions.

The engine can be loud. If the noise makes you uncomfortable, wear

ear protection. Be considerate of your neighbors by not running your

model early in the morning or late in the evening.

Most importantly, use good common sense at all times.

Safety Precautions

All instructions and

precautions outlined in this

manual should be strictly

followed to ensure safe

operation of your T-Maxx 3.3.

T-Maxx 3.3 is not intended

for use by children under 16

years of age without the

supervision of a responsible

and knowledgeable adult.

12 AA alkaline batteries

(see page 23)

Hobby knife

Traxxas Top Fuel™

see page 22

Fuel dispensing bottle

Traxxas part #5001 shown*

Small flat-blade screwdriver

for tuning (1/8 inch blade)

After-run oil to protect

the engine from corrosion

10% quart - #5010

20% quart - #5020

33% quart - #5030

10% gallon - #5060

20% gallon - #5070

33% gallon - #5080

NiCad or NiMH

7.2V battery pack NiCad or NiMH battery charger

Traxxas part #3030X shown*

Philips screwdriver

TRAXXAS

Glow plug and

wheel nut wrench

1.5mm “L” wrench 2.0mm “T” wrench

U-joint wrench 4-way wrench

Required Tools and Equipment (sold separately)

TRAXXAS

Foam air filter oil and

extra oiled air filter element

Accessory Equipment (sold separately)

RX battery power pack

Traxxas part #3037

TRAXXAS

DC car adapter for TRX Power Charger

Traxxas part #3032

TRX Power Charger

Traxxas part #3030X

8mm/5mm wrench Antenna nut wrench

2.5mm “L” wrench

T-MAXX 3.3 •5

T-Maxx 3.3 comes with a set of specialty metric tools. You’ll need to purchase other items, available from your hobby dealer, to operate and maintain your model.

Tools, Supplies, and Required Equipment

For more information on

radio system batteries, see

Use the Right Batteries on

page 11.

Apeak-detecting charger is

recommended for best

performance and longest

battery life. For more

information, see Use the

Right Charger on page 26.

Recommended Equipment

These items are not

required for the operation

of your model, but are a

good idea to include in any

R/C toolbox:

•Safety glasses

•Thin, hobby-quality

cyanoacrylate instant tire

glue (CA glue)

•Side cutters or needle

nose pliers

Supplied Tools and Equipment

Suspension multi-tool

*sold separately

RX Wiring Harness

Traxxas part #3034

6•T-MAXX 3.3

Fuel Tank

Fuel Cap

Shifting Servo

Suspension Arm

Rear Bumper

Bumper Mount

Skid Plate

Ultra Shock™

(Oil Damper)

Differential

Toe Link

(Turnbuckle)

Throttle/Brake

Servo

Transmission

Air Filter

Tuned Pipe

Exhaust Header

TRX 3.3 Racing

Engine

see pg. 18 for details

Pressure Line

Fuel Line

EZ-Start Motor

EZ-Start Plug

Bulkhead

Body Mount Post

Spur Gear

Chassis

Slipper Clutch

Driveshaft

(Half Shaft)

On/Off Switch

Shift Rod

Antenna Mount

Two-Speed Access Plug

Pipe Hanger Receiver Box

OptiDrive™Electronic

Shift Module

Engine Shut-off

Clamp

Pivot Ball

Hex Hub

Axle Carrier

Steering Servo

Disc Brake

Anatomy of Your T-Maxx 3.3

Wheelie Bar Shock Tower

Battery Box

T-MAXX 3.3 •7

Quick Start: Getting up to Speed

The following guide is an overview of the procedures for getting your T-Maxx 3.3 running, from opening the box to breaking in and tuning your

engine. Refer to the pages indicated for details on each step. Look for the Quick Start logo on the bottom corners of Quick Start pages.

1. Read the safety precautions on page 4

For your own safety, understand where carelessness and misuse

could lead to personal injury.

2. Charge the EZ-Start battery pack • See page 26

The EZ-Start requires a fully charged 7.2-volt battery

pack (sold separately).

3. Install the antenna • See page 13.

Install the antenna mast on the T-Maxx 3.3.

4. Install batteries in the transmitter • See page 11

T-Maxx 3.3 requires 8 AA alkaline or rechargeable batteries*

for the transmitter.

5. Decal and Install the body • See page 8

You will need to use the body during break in, so it's best to apply

any additional decals before you use the body.

6. Install batteries in the model • See page 12

T-Maxx 3.3 requires 4 AA alkaline or rechargeable

batteries* for the receiver.

7. Install the EZ-Start battery • See page 26

Install and connect a charged 7.2-volt battery pack in

the EZ-Start controller.

8. Turn on the radio system • See page 16

Make a habit of turning the transmitter on first, and off last.

9. Check servo operation • See page 17

Make sure the throttle, shifting, and steering servos are working

correctly.

10. Range test the radio system • See page 17

Follow this procedure to make sure your radio system works properly

at a distance and that there is no interference from outside sources.

11. Fill the fuel tank • See page 23

Use your fuel-dispensing bottle* to fill the tank.

12. Connect the EZ-Start to the model • See page 27

Learn the proper way to use the EZ-Start electric starting system

13. Start the engine • See page 28

Learn to use the correct starting procedure for your TRX 3.3.

14. Break-in your engine • See page 28

Follow the break-in instructions exactly to ensure the

best-performing, longest-lasting engine.

15. Tune your engine • See page 31

Learn how to set the fuel mixture needles for optimum

engine performance.

16. Drive your T-Maxx 3.3 • See page 34

Learn to use the two-speed and reverse functions on your truck,

along with important driving precautions.

17. Maintaining your Truck • See pages 41-42

Follow these critical steps to maintain the performance of your

T-Maxx 3.3 and keep it in excellent running condition.

The Quick Start Guide is

not intended to replace

the full operating

instructions available in

this manual. Please read

this entire manual for

complete instructions

on the proper use and

maintenance of

your T-Maxx 3.3.

Look for the Quick Start

logo at the bottom of

Quick Start pages.

*sold separately

8•T-MAXX 3.3

Applying The Decals

The main decals have already been

applied to your T-Maxx 3.3. The extra

decals provided are die-cut for easy

removal. Use a hobby knife to lift the

corner of a decal and remove it from

the backing.

Carefully position the decal over the

desired location and press one side on

the body. Pull the decal tight and use

afinger to gradually smooth out any

air bubbles as you apply the decal.

Look at the photos on the box for

typical decal placement.

Tire Gluing

The factory tires on your T-Maxx 3.3 are already glued to the rims. The

tires must be glued to the rims to prevent the rims from spinning inside

the tires. The instructions here are provided to show you how to glue

replacement tires to the rims in the future. Use CA tire glue available

from your local hobby dealer. You can glue the tires without removing

the wheels from the truck. For clarity, these instructions show the

process with the wheels removed.

Gluing the Tires and Decorating your T-Maxx 3.3

1. Remove a wheel from T-Maxx 3.3

using the larger (8mm) end of

the glow plug (universal)

wrench.

2. Use your thumb to push the side

of the tire away from the rim.

Place one or two drops of CA

glue into the opening and

release the tire. Capillary action

will draw the glue around the

bead of the tire.

3. Repeat step two at four or five

points around the rim, until the

tire is completely secured to the

rim. Turn the rim over and repeat

the process for the inside of the

rim/tire. Repeat for the other

three wheels.

4. Reinstall the wheels, make sure

none of the axle pins have fallen

out from behind the hex hubs.

Always wear safety glasses

to prevent glue from

splattering into your eyes.

The acetone in fingernail

polish remover will

remove excess glue from

your fingers.

For best results while

gluing, clean the bead of

the tires and the grooves

of the wheels with

denatured alcohol before

applying glue. This

removes any mold release

agent residue from the

tires and wheels,

providing a better bond.

T-MAXX 3.3 •9

CH.3 CH.2 CH.1

The Traxxas TQ-3 Radio System

Your T-Maxx 3.3 is equipped with the TQ-3 radio system. The TQ-3 is a 3-channel system that provides up to a quarter mile range and control for up to

three servo outputs. The TQ-3 works in conjunction with the OptiDrive™Electronic Shift Module to monitor and control the input and output signals for

the throttle and shifting servos (channels). The OptiDrive monitors the voltage of the on-board batteries. The "Function" LED will flash red if the battery

voltage is too low.

Antenna Throttle Neutral Adjust

Steering Wheel

Throttle Trim

Steering Trim

Reverse Shift

Forward Shift

Power Switch Power IndicatorBattery Compartment

Servo Reversing

Switch

Throttle

Trigger

T-Maxx 3.3 Wiring Diagram

Antenna

On/Off

Switch

Receiver

4-cell Battery

Holder

Steering Servo

Throttle/Brake

Servo

Shifting Servo

The OptiDrive ESM is

designed to adapt and

work with aftermarket

three channel radio

systems (see page 15).

OptiDrive ESM

(Electronic Shift

Module)

Battery

Channel 1

Channel 2

Channel 3

TQ-3 Transmitter

To Transmission

(OptiDrive sensor)

10 •T-MAXX 3.3

Radio System Terminology

Please take a moment to familiarize yourself with these radio-system

terms. They will be used throughout this manual.

5-Cell Pack –Another term for RX Pack or rechargeable receiver pack.

The RX pack is made up of five rechargeable NiMH battery cells and is

used in place of the 4AA batteries in the model.

Channel -The 27 MHz frequency band is divided into 6 channels so that

up to six models can be operated simultaneously. Each channel is

referred to by its flag color and channel number, as shown below.

Clearing your frequency -Aroutine, verbal check to make sure

nobody else in your area is operating on the same channel. Always

clear your frequency by calling out your channel number before

operating your model. Wait or move to another area if your channel

is already being used.

Crystal (X-tal) -The plug-in device that determines which channel the

radio system will operate on. For each channel, there are two crystals,

one for the receiver and one for the transmitter. Of those two crystals,

the one marked “RX” with the lower number (.455 MHz lower) must be

inserted into the receiver.

Frequency band -The radio frequency used by the transmitter to send

signals to your T-Maxx 3.3. All Traxxas RTR models operate on a 27 MHz

frequency band.

mAh –Abbreviation for milliamp hour. Measure of the capacity of the

battery pack. The higher the number, the longer the battery will last

between recharges.

Neutral position -The standing position that the servos seek when the

transmitter controls are at the neutral setting.

NiCad -Abbreviation for nickel-cadmium. The original rechargeable

hobby pack, NiCad batteries have very high current handling, high

capacity, and can last up to 1000 charging cycles. Good charging

procedures are required to reduce the possibility of developing a

“memory” effect and shortened run times.

NiMH -Abbreviation for nickel-metal hydride. Rechargeable NiMH

batteries offer high current handling, and much greater resistance

to the “memory” effect. NiMH batteries generally allow higher

capacity than NiCad batteries. They can last up to 500 charge

cycles. A peak charger designed for NiMH batteries is required

for optimal performance.

Receiver -The radio unit inside your T-Maxx 3.3 that receives signals

from the transmitter and relays them to the servos.

RX Pack -RX is a common abbreviation for the radio receiver and items

associated with it. RX Pack denotes the optional rechargeable battery

pack used to power the radio system in the model. It is available as

Traxxas part number 3037.

Servos -Small motor units in your T-Maxx 3.3 that operate the throttle

and steering mechanisms.

Three-channel radio system -The TQ-3 radio system, consisting of the

receiver, the transmitter, and the servos. The system uses three

channels: one to operate the throttle, one to shift the transmission,

and one to operate the steering.

Transmitter -The hand-held radio unit that sends throttle and steering

instructions to your T-Maxx 3.3.

Trim -The fine-tuning adjustment of the neutral position of the servos,

made by turning the throttle and steering trim knobs on the face of

the transmitter.

The Traxxas TQ-3 Radio System

Channel Frequency

Band

Flag

Color

Traxxas

Part No.

1 26.995 Brown 2031

2 27.045 Red 2032

3 27.095 Orange 2033

4 27.145 Yellow 2034

5 27.195 Green 2035

6 27.255 Blue 2036

Learn terms related to the

TRX 3.3 Racing Engine

beginning on page 20.

T-MAXX 3.3 •11

Installing Transmitter Batteries

Your TQ-3 transmitter uses 8 AA batteries. The battery compartment is

located in the base of the transmitter.

1. Remove the battery compartment door by pressing the tab and

lifting the door up.

2. Install the batteries in the correct orientation as indicated in the

battery compartment.

3. Reinstall the battery door and snap it closed.

4. Turn on the transmitter and check the power indicator for a

solid red light.

If the power indicator light flashes, then the transmitter batteries are

weak, discharged or possibly installed incorrectly. Replace with new or

freshly charged batteries. The power indicator light does not indicate

the charge level of the batteries installed in the model.

The Traxxas TQ-3 Radio System

CH.3 CH.2 CH.1

Use the Right Batteries

Your transmitter uses AA

batteries. Use new alkaline

batteries, or rechargeable

batteries such as NiCad or

NiMH (Nickel Metal Hydride)

batteries in your

transmitter. Make sure

rechargeable batteries are

fully charged according to

the manufacturer’s

instructions.

If you use rechargeable

batteries in your

transmitter, be aware

that when they begin

to lose their charge, they

lose power much more

quickly than regular

alkaline batteries.

Caution: Discontinue

running your T-Maxx 3.3

at the first sign of weak

batteries (flashing red

light) to avoid losing

control.

If the power indicator

doesn’t light red, check the

polarity of the batteries.

Check rechargeable

batteries for a full charge.

12 •T-MAXX 3.3

The Traxxas TQ Radio System

Installing Receiver Batteries

The radio receiver in your T-Maxx 3.3 uses 4 AA batteries. The battery

holder for the receiver batteries is located underneath the battery cover.

The battery cover can be identified by the on/off switch.

1. Remove the battery cover by

removing the two 3x10mm

buttonhead cap screws

from the cover.

2. Remove the battery holder

and install 4 AA alkaline

batteries. Make careful

note of the battery polarity

by comparing against the

diagrams in the battery holder.

3. Insert the battery holder into

the battery cover.

4. Reinstall the battery cover and secure with the screws

(see sidebar!).

To prevent losing control of your model, it is important to stop at the

first sign of weak receiver batteries. Visible warning signals include

sluggish steering response and shortened radio range.

In addition, the Optidrive is equipped with a low-

voltage indicator and a failsafe circuit. When the

voltage of the receiver batteries drops below 4.3

volts, the “Function” LED on the OptiDrive will flash

red. If the voltage drops below 4.3 volts for more

than 2 seconds, the OptiDrive ignores throttle and

shift signals and applies 25% brakes (failsafe mode). Steering will still be

operational and the “Function” LED on the OptiDrive will flash red. The

OptiDrive will stay in failsafe mode until the power is turned off or the

receiver battery voltage rises above 4.3 volts for more than 2 seconds.

Anytime the “Function” LED flashes red, it is time to stop and install new

batteries (or recharge your battery pack if equipped). Do not try to

continue running your model with weak receiver batteries on board.

On/Off

Switch

4-cell

battery

holder

Traxxas TRX Power System (optional)

The optional Traxxas TRX Power System can

be purchased separately to power the radio

system in the T-Maxx 3.3. Benefits include the

economy of a rechargeable 5-cell nickel metal

hydride (NiMH) battery pack that replaces AA

alkaline batteries, and increased voltage for

dramatically improved servo performance. The

TRX Power Charger (Part #3030X) is a peak-

detecting unit that will charge the RX Power

Pack (Part #3036 flat pack or #3037 hump pack) in about one hour. The

peak detection circuitry automatically shuts off the charger when the

maximum charge has been achieved. The TRX Power Charger also

includes a 7.2V adapter for charging 7.2V EZ-Start batteries. The TRX

Power Charger can operate on either AC or DC power. A special wiring

harness for T-Maxx (Traxxas part #3034) that includes a handy external

charging jack is required.

The optional DC car adapter (Part #3032) features a

tangle-free, extra long wire and integrated fuse. The

long charging cord allows the model to remain outside

the car while charging. Caution! Never charge batteries

in an enclosed car interior or while driving. Never leave

charging batteries unattended. Monitor them closely.

Traxxas' integrated TRX Power System is the easiest way to add the

power and economy of rechargeable batteries to your T-Maxx 3.3.

Consult your hobby dealer for purchasing information.

Direct the battery wires

through the slot in the

battery cover. If the wires

are not properly routed,

they may become broken

or shorted, causing radio

system failure and loss of

control. If you use

rechargeable batteries in

your receiver, be aware

that when they begin to

lose their charge, they lose

power much more quickly

than regular alkaline

batteries. Signs of weak

receiver batteries include

sluggish steering response

and shortened radio

range. Caution:

Discontinue running your

T-Maxx 3.3 at the first sign

of weak batteries to avoid

losing control.

If the radio system doesn’t

appear to work when the

transmitter and receiver

switches are turned on,

check for correct battery

installation.

T-MAXX 3.3 •13

Setting up the Antenna

1. Locate the black antenna wire that exits the top

of the receiver box.

2. Pull the wire straight with your fingers and then insert the end of

the wire into one end of the antenna tube (the antenna tube, tip,

crimp nut and sleeve are located in the documents bag). Push the

wire all the way through the antenna tube.

3. Insert the base of the tube into the antenna post. Take care not to

crimp the antenna wire.

4. Slide the crimp nut over the antenna tube and screw it onto the

antenna post. Use the supplied tool to tighten the crimp nut on

the post just until the antenna tube is securely in place. Do not

over tighten or crush the antenna wire against the receiver box.

5. Fold the top of the antenna wire over the top of the antenna tube.

Slide the antenna sleeve over the tube to retain the antenna wire.

Now slide the antenna tip onto the top of the antenna tube. Never

cut or shorten the antenna wire.

6. On the transmitter, always fully extend the telescoping antenna

when running your T-Maxx 3.3. Make a habit of holding the

transmitter so the antenna points straight up.

The Traxxas TQ-3 Radio System

Spray a little window

cleaner on the antenna

wire to make it easier

to push through the

antenna tube.

Don’t shorten the length

of the antenna wire. Its

length is tuned to the

frequency band; cutting it

could severely shorten the

radio system’s range.

Don’t push the

transmitter antenna down

from the top. Pull it down

from the bottom, one

segment at a time, to

prevent binding and

kinking the antenna mast.

Antenna Tip

Antenna Tube

Antenna Sleeve

Antenna Wrench

Antenna Crimp Nut

Antenna Post

14 •T-MAXX 3.3

Steering

Brake

Neutral

Accelerate

CH.3CH.2CH.1

Shift Reverse

Shift Forward

TQ-3 Radio System Controls

The Traxxas TQ-3 Radio System

TQ-3 Radio System Adjustments

In addition to the electronic throttle and steering trim controls, your

radio system features throttle neutral adjustment and servo reversing

switches.

Throttle Neutral Adjustment

The throttle neutral adjustment is located on the transmitter face and

controls the forward/reverse travel of the throttle trigger. Change the

adjustment by pressing the button and sliding it to the desired position.

There are two settings available:

50/50: Allows equal travel for both acceleration and braking.

70/30: Allows more throttle travel (70%) and less brake travel (30%).

50/50 is the required setting for T-Maxx 3.3 with the TRX 3.3 Racing Engine.

Electronic Throttle Trim

The electronic throttle trim located on the face of the transmitter adjusts

the neutral (center) point of the throttle servo when the servo is at rest.

This control has been preset for you at the factory. If necessary, adjust

the control so that the carburetor is at idle, and the brakes are not

applied (the model will roll freely). Do not use the throttle trim to raise

or lower the engine idle speed. Make the idle speed adjustment on the

carburetor.

Electronic Steering Trim

The electronic steering trim located on the face of the transmitter

adjusts the neutral (center) point of the steering servos when the servos

are at rest. Adjust this control to make the model drive straight with no

steering input at the wheel.

T-MAXX 3.3 •15

Servo Reversing Switches

The servo reversing switches are located on the front of the transmitter,

next to the on/off switch. Moving a switch reverses the direction of the

corresponding servo. Each switch corresponds to a channel, as shown

below. For example, if you turn the steering wheel to the right and your

front wheels turn left, you would move the channel 1 switch to correct

the servo direction. It may be necessary to adjust the corresponding trim

control after

moving a switch.

The default

position for the

servo reversing

switches is shown.

Programming the OptiDrive™ESM

The OptiDrive ESM electronically monitors

vehicle speed and controls forward and reverse

shifting. Controlling the shift action electronically

rather than by mechanical systems reduces the

number of components in the transmission. The

transmission weighs less, there is lower

rotational mass for quicker acceleration, and

constant drive engagement for smooth power delivery.

The OptiDrive module prevents the transmission from changing

directions while the truck is in motion. The truck must be completely

stopped to change directions, regardless of the position of the shift

selector switch on the transmitter. The OptiDrive module is preset at the

factory. If the transmitter throttle trim adjustment is changed, then the

OptiDrive module will need to be re-programmed.

1. The engine must be shut off. The radio system must be on (receiver

and transmitter).

2. Set the TQ-3 Transmitter to its factory default shift settings:

Set the THROTTLE NEUTRAL switch to the 50/50 setting.

Set the THROTTLE TRIM to the center “0” setting, then adjust the

throttle linkage until the carburetor closes.

Set the CHANNEL 2 SERVO REVERSING SWITCH to the right position.

Set the CHANNEL 3 SERVO REVERSING SWITCH to the right position.

DO NOT change the position of any of the servo reversing switches

after programming the OptiDrive. If settings were changed after

programming the OptiDrive, it will have to be reprogrammed.

3. With the throttle at neutral, press and hold the

SET button until the Function LED flashes green

twice and then release the button immediately.

You are now in programming mode.

4. Pull the transmitter throttle

trigger to the full throttle

position. Hold it there until the

Function LED flashes green

three times. Note: The throttle

servo will not move during programming even though it is connected

to the controller.

5. Release the transmitter throttle

trigger allowing it to return to

neutral. The Function LED will

turn solid green, indicating that

the shifting servo is OK to shift

and the programming has been completed. The controller is now

programmed and ready to go!

If the transmitter throttle settings are changed, it will be necessary

to complete the programming sequence again.

If the SET button is released before the Function LED flashes

green twice in step 3, the OptiDrive will return to the normal

operation mode.

If you experience any problems during programming, turn the

receiver off, then on again, and repeat the programming steps.

For instructions on how to use the OptiDrive with aftermarket radio

systems, or to access advanced programming options, visit our website,

www.Traxxas.com.

CH.3 CH.2 CH.1

Channel Servo

1 Steering

2Throttle and braking

3Shifting

The Traxxas TQ-3 Radio System

Large adjustments to the

throttle trim and/or throttle

linkage may require re-setting

the OptiDrive to maintain

proper shifting action.

TQ-3 Channel to Servo Chart

For transmission durability,

the OptiDrive ESM limits the

model’s reverse speed to about

70% of full throttle. If settings

are changed, and you notice a

decrease in forward top speed,

you could have the OptiDrive

system reversed. Return the

TQ-3 servo-reversing switches

for channels two and three

back to their default settings

and re-program the OptiDrive

Module. For programming with

aftermarket radio systems,

please see our website.

•Green “Function”

Shift allowed

•Red flashing “Function”

Low battery, see pg. 12

•Red “Sensor”

a) Sensor, throttle or shift

circuit is broken. Possible

disconnected or broken sensor,

throttle or shift wires. Possible

damaged sensor.

b) Receiver has lost signal from the

transmitter, the OptiDrive has

entered fail-safe (throttle and shift

servos become unresponsive).

•Blue flashing “Sensor“

Normal operation as

vehicle moves. Indicates

signal pulse from sensor. Depending

on the rotor position, solid blue or off

when vehicle is at rest.

OptiDriveOperation

16 •T-MAXX 3.3

TQ-3 Radio System Rules

Each time you prepare to run your T-Maxx 3.3,

you must clear your frequency to be sure no

one else in the area is using the same channel

as you.

There are six possible channels, numbered

1through 6. Each is represented by a color.

Look at the crystal plugged into the back of

your transmitter to determine which channel

your truck is assigned to.

Always turn your TQ-3 transmitter on first

and off last. This procedure will help to prevent your T-Maxx 3.3 from

receiving stray signals from another transmitter, or other source,

and running out of control.

Always have the transmitter and receiver turned on before you start

the engine. Never turn the radio system off while the engine is

running. The on/off switch in the model only turns the receiver on

and off. It does not turn off the engine.

Always use new or freshly charged batteries for the transmitter, and

make sure the receiver batteries are fresh. The function light on the

OptiDrive will flash red if the receiver batteries become weak. Weak

batteries will limit the radio signal between the receiver and the

transmitter. Loss of the radio signal can cause you to lose control of

your T-Maxx 3.3.

CH.3 CH.2 CH.1

Always turn your transmitter on first. Always turn your receiver on second. Then start your engine.

12 3

Remember, always turn the

TQ-3 transmitter on first and

off last to avoid damage to

your T-Maxx 3.3. Never turn

the radio off while the

engine is running.

The Traxxas TQ-3 Radio System

Channel 1

Brown

Channel 2

Red

Channel 3

Orange

Channel 4

Yellow

Channel 5

Green

Channel 6

Blue

T-MAXX 3.3 •17

The Traxxas TQ-3 Radio System

Using the TQ-3 Radio System

The TQ-3 Radio System was pre-adjusted at the factory. The adjustment

should be checked before running the model, in case of movement

during shipping. Here’s how:

1. Fully extend the chrome antenna mast on the transmitter and turn

the switch on. The red indicator light on the transmitter should be

solid red (not flashing).

2. Turn on the receiver switch in the model. The switch is located in the

top of the radio compartment. The function light on the OptiDrive

ESM should be green. A red flashing LED indicates low voltage in the

receiver batteries. The sensor LED is intermittent depending on the

rotor position.

3. Position T-Maxx 3.3 so that its front wheels are off the ground.

4. Turn the steering wheel on the transmitter back and forth and check

for rapid operation of the steering servo. Also, check that the steering

mechanism is not loose or binding. If the steering operates slowly,

then make sure you have fresh receiver batteries .

5. When looking down at model, the front wheels should be pointing

straight ahead. If the wheels are turned slightly to the left or right,

slowly adjust the steering trim control on the transmitter until they

are pointing straight ahead.

6. Operate the throttle trigger on the transmitter and check for rapid

operation of the throttle servo. When the throttle trigger is pulled

back, the carburetor should open (slide moves out). When the

throttle trigger is pushed all the way forward, the brake should lock.

7. Operate the shift button on the transmitter and check for rapid

operation of the shifting servo. Push the shift button down for

forward. The servo will operate the spring-loaded shift mechanism

and you will hear the transmission click into forward. Push the shift

button up for reverse and you will again hear the transmission click

and shift into gear.

8. Once adjustments are made, turn off the receiver on your T-Maxx 3.3,

followed by the hand-held transmitter.

Range-Testing the TQ-3 Radio System

Before each running session with your T-Maxx 3.3, you should range-test

your radio system to ensure that it operates properly.

1. Turn on the radio system and check its operation as described in the

previous section (Using the TQ-3 Radio System).

2. Have a friend hold the model with the engine off.

3. Make sure your transmitter antenna is fully extended, and then walk

away from the model with the transmitter until you reach the farthest

distance you plan to operate the model.

4. Operate the controls on the transmitter once again to be sure that

the model responds correctly.

5. Do not attempt to operate the

model if there is any problem

with the radio system or any

external interference with your

radio signal at your location.

When the engine is running,

don’t use the throttle trim

on the transmitter to adjust

the engine idle speed.

Instead, use the idle speed

adjustment on the

carburetor. Do not use the

throttle trim as an “idle up”

function for starting or you

could affect the OptiDrive

programming

Don’t attempt to operate

your T-Maxx 3.3 if there are

any problems with your radio

system or radio interference

at your location.

Throttle/Brake

Servo

Shifting

Servo

Steering

Servo

Throttle

Brake

T-Maxx 3.3

Servo Operation

18 •T-MAXX 3.3

Traxxas strongly

discourages changing or

modifying any part of the

TRX 3.3 Racing Engine. Old

tech tips and tricks that

may have boosted the

power of other engines

could seriously diminish

the performance of the

TRX 3.3 Racing Engine.

There’s more advanced

thinking, development and

testing in the stock parts of

your TRX 3.3 Racing Engine

than in many aftermarket

manufacturer’s

performance parts. The

TRX 3.3 Racing Engine is

already the most powerful

engine in its class and may

not benefit from average,

low-tech, aftermarket bolt

on performance items.

Introduction

The TRX 3.3 Racing Engine is the next generation of TRX nitro power.

The larger displacement and advanced porting generate class-leading

horsepower while still maintaining the TRX Racing Engine characteristics of

broad, linear power delivery and ease of tuning. Focused engineering and

rigorous testing have yielded unprecedented power and uncompromising

performance that turns ready-to-run into Ready-To-Race®.

The TRX 3.3 Racing Engine takes a total-system approach. Each part of

the engine, from the air filter to the exhaust tip, is carefully engineered

to work in harmony with other engine components. Each part

complements the next, to extract maximum power. The TRX 3.3 Racing

Engine is designed to be tolerant of variations in tuning, and to run

successfully through a wide range of variable atmospheric conditions

such as changes in temperature, humidity, and altitude.

In order to get the longest engine life and keep the TRX 3.3 Racing

Engine in top running condition, it is very important to perform regular

routine maintenance. The number one cause of premature engine

wear and failure is lack of care and maintenance!

Break-In

The TRX 3.3 Racing Engine is manufactured to exacting tolerances and

requires a specially-designed break-in procedure to accomplish the final

precision fitting of the internal engine components. It is very important

that you follow the new break-in procedure as closely as possible to

achieve the best performance and longest life from your TRX 3.3 Racing

Engine. Engine break-in will take between one and two hours. Old style

break-in procedures, such as idling the engine on the bench for several

tanks of fuel or simply running the engine with a very rich fuel mixture

for the first 4 tanks of fuel, will not achieve the best results. Follow the

easy steps in this manual.

Air Filter Maintenance

Aclean air filter is critical for long engine life. Due to the high-

performance nature of the TRX 3.3 Racing Engine, a tremendous amount

of vacuum is created to move a large volume of high-velocity air through

the carburetor. Dirt is the worst enemy to your engine. Clean the air filter

after each hour of running to prevent sucking dirt into the engine. An

extra pre-lubed air filter element has been provided to encourage you to

maintain your air filter.

After-Run Maintenance

Perform after-run maintenance on the engine to prevent corrosion

from building up on the internal engine components. The fuel

naturally attracts moisture and corrosion can build up very quickly

inside the engine if it is not prevented.

Afew minutes spent before and after each time you run your model

will allow you to enjoy it for a long time to come. Read on for more

exciting details about your new engine.

The TRX 3.3 Racing Engine™

T-MAXX 3.3 •19

TRX 3.3 Racing Engine Illustrated

Head Protector

PowerTune™Head

(Cylinder Head)

EZ-Start™Drive Unit

EZ-Start™Motor

Engine Mount

Low-Speed Needle

Throttle Arm

Crankshaft

Flywheel

Carburetor

Air Intake

Fuel Intake

High-Speed

Needle

Idle Speed

Screw

EZ-Start™Plug

Positive Wire

Negative Wire

Fuel Line

Fuel Tank

Tuned Pipe

Exhaust

Tip

Pressure Line

Ground Wire

Glow Plug Wire

EZ-Start™

Controller

Clutch Bell

Crankcase

Engine

Shut-off

Clamp

Air Filter Housing

Glow Plug

The TRX 3.3 Racing Engine

20 •T-MAXX 3.3

Terms to Know

You’ll find these Nitro R/C engine terms throughout this section

of the manual.

.15 -.15 or “15” refers to the displacement of the engine. The TRX 2.5

Racing Engine is .15 cubic inches or 2.5 cubic centimeters (cc). The name

“TRX 2.5” is derived from the cc measurement.

.20 - .20 or “20” refers to the size of the engine. The TRX 3.3 is .20 cubic

inches or 3.3 cubic centimeters (cc). The name “TRX 3.3” is derived from

the cc measurement.

ABC -Abbreviation for aluminum, brass, and chrome. Refers to engine

construction that consists of an aluminum piston that slides in a chrome-

plated brass sleeve. The TRX 3.3 uses ABC construction.

Air filter -The air filter sits atop the carburetor and prevents harmful dust

and dirt from entering the engine. Dirt ingestion is the number one

cause of premature engine failure so the engine should never be run

without the air filter in place.

BDC -Bottom dead center. The bottom-most position of the engine piston

stroke.

Break-in -Break-in is the procedure for running a brand new engine

according to specific instructions. This correctly prepares the engine for

normal running. The break-in procedure can be different for different

makes of engines. Follow the Traxxas directions for break-in exactly.

Carb -Abbreviation for carburetor.

Carburetor -The carburetor atomizes (mixes) the fuel with the air so that

the engine can burn it. There are two types of carburetors; slide carbs

and barrel carbs. The TRX 3.3 uses the superior slide carburetor design.

Clean-out -Cleaning-out is a condition that occurs when the engine is

accelerating and the fuel mixture becomes sufficiently lean to allow the

engine to continue into its upper rpm power band. It is usually

characterized by a noticeable decrease in blue exhaust smoke and a

dramatic increase in engine speed.

Combustion chamber -The combustion chamber is machined into the

bottom of the cylinder head. This is where the glow plug ignites the fuel.

The shape of the combustion chamber is designed to promote more

efficient burning of the fuel.

Connecting rod -The connecting rod transfers the piston motion to the

crankshaft. The TRX 3.3 Racing Engine uses a “knife-edged” connecting

rod. The aerodynamic, sharpened edges allow it to “slice” through the

pressurized air/fuel mixture inside the crankcase.

Crankcase -The engine’s “body” that contains all of the running

mechanical components.

Crankshaft -The main shaft of the engine that holds the

reciprocating assembly.

Cooling fins -The cooling fins are milled into the cylinder head and

crankcase and cause heat to be drawn away from the engine. Heat is

removed when it dissipates into the air passing across the cooling fins. It

is important to keep the fins clean of dirt and debris for maximum

cooling efficiency.

Cylinder head (head) -The finned aluminum part on top of the engine

that is responsible for dissipating most of the engine’s heat. The

combustion chamber is machined into the bottom of the head.

Dyno -Abbreviation for dynamometer. A precise piece of testing

equipment that accurately measures engine power and torque output

over the engine’s entire rpm range.

EZ-Start -Traxxas on-board electric starting system. The system consists of

ahand held starter control unit and an on-board gearbox with an electric

motor to spin the engine.

Filter foam -The oiled foam element inside the air filter housing. The filter

foam in the TRX 3.3 must be thoroughly cleaned and re-oiled after every

hour of run time.

Fit -Usually refers to the fit of the piston and sleeve. If the fit is tight, the

piston will feel very tight at top of the sleeve (top dead center), and the

engine will have good sealing and compression. If the fit is loose,

compression will be low and both the piston and sleeve should be

replaced.

Flame-out -Occurs when the engine stops running at high rpm. Usually

the fault of an excessively lean fuel mixture or glow plug failure.

Fuel -(10%, 20%, 33%) The TRX 3.3 must have model engine fuel to run.

Traxxas Top Fuel™is recommended. Fuel is sold in quarts and gallons

from hobby dealers. The 10%, 20% and 33% labeling refers to the

percentage of nitromethane contained in the fuel.

Fuel mixture -The ratio of fuel to air as determined by the needle settings

of the carburetor.

Fuel tubing (fuel line)-The thick silicone tubing that carries fuel from the

fuel tank to the carburetor.

Glow plug -The glow plug is located in the cylinder head at the top of the

combustion chamber. It contains an element that glows red hot when

voltage is applied. When the engine is being started, the heat from the

glow plug ignites the fuel mixture and starts the combustion process.

The TRX 3.3 Racing Engine

T-MAXX 3.3 •21

Glow plug driver -This tool clips onto the glow plug and supplies the

required voltage to light the glow plug element. It is also called an

igniter. EZ-Start equipped engines do not require this separate tool.

Header -The aluminum tube that connects the exhaust system to the

engine exhaust port. The length and diameter of the header must be

carefully selected to extract the most power from the engine.

High-speed needle (HSN) -Adjusts the carburetors fuel/air mixture at

high throttle openings.

Idle speed -The speed (rpm) the engine runs at when the transmitter’s

throttle trigger is at neutral.

Idle speed screw (ISS) -Located on the carburetor body. This screw

adjusts the idle rpm of the engine.

Lean -Arunning condition where the engine is not getting enough fuel

(for the available air). Symptoms include engine overheating, or the

engine runs for a short time and then stalls, particularly at high speed.

This is a dangerous condition that should be corrected immediately or

it can ruin your engine.

Leaning the mixture -Turning either the high-speed and/or low-speed

needle(s) clockwise to decrease the amount of fuel the engine receives.

Low-speed needle (LSN) -Needle valve that controls the fuel mixture at

low throttle openings.

Needle valve -Valve consisting of a tapered needle that closes against a

corresponding seat to regulate fuel flow.

Nitro -Abbreviation for nitromethane, a component of model engine

fuel that improves fuel combustion and power output. Nitro also refers

to a class of R/C powered by model engines instead of electric.

Nitro content -The amount of nitromethane used in the fuel. Usually

measured as a percentage of the total fuel volume. Traxxas engines are

optimized to use 10-20% nitro. 33% nitro may be used for racing.

Nitromethane -Nitromethane is a component in the fuel that increases

power from the combustion process up to a point. Engines are

generally optimized to use a range of nitro content for the best power.

O-ring -Rubber “O”-shaped ring used as a sealing gasket.

Pipe -Abbreviation for the tuned exhaust pipe on a nitro engine. See

“Tuned Pipe”.

Piston -The piston is the internal engine part that is attached to the

upper end of the connecting rod and moves up and down in the

cylinder sleeve. The precise fit between the piston and the sleeve

creates a seal that allows the engine to have the required compression

for combustion.

Port -Ports are openings in the sleeve that allow atomized fuel to enter

the combustion chamber and burned exhaust gases to exit. The shape

and location of the ports are a large factor in controlling the engine

timing and power output.

Priming -Manually causing fuel to move from the fuel tank up to the

carburetor. This is sometimes necessary after the engine has been

sitting for a long period of time and all of the fuel has drained back to

the tank. On a Traxxas model this is done by holding your finger over

the exhaust tip for one or two seconds while the engine is starting.

Punch -Aterm that refers to how quickly the model responds to throttle

input or how quickly it accelerates.

Rich - A running condition where the engine is getting too much fuel for

the available air. It is better to run an engine slightly rich to increase

engine life. Excessively rich mixtures cause the engine to have sluggish

performance with exaggerated blue smoke and unburned fuel coming

from the exhaust.

rpm -Abbreviation for revolutions per minute (how many times the

engine crankshaft spins in a minute).

Sleeve -Internal engine part that contains the piston. The precise fit

between the sleeve and the piston creates a seal that allows engine to

have the required compression for combustion. The sleeve in a TRX

engine is made of brass and is then hard-chrome plated.

Slide carburetor -The throttle on a slide carburetor closes and opens by

sliding a barrel in and out of the carburetor body. This type of

carburetor is preferred for performance use because it provides a less

restrictive “straight-through” air path than the barrel carburetor design.

Stall -When the engine stops running, usually due to an incorrect fuel

mixture setting or running out of fuel.

TDC -Top dead center. The top-most position of the engine

piston stroke.

Tuned pipe -The tuned exhaust pipe usually consists of a specially-

shaped metal or composite chamber with baffles that is designed to

enhance the power output of the engine.

Wear-in -Fitment process that occurs during engine break-in where

internal engine parts develop an even more precise matched fit

through actual use under controlled circumstances.

WOT -Abbreviation for wide-open throttle.

The TRX 3.3 Racing Engine

22 •T-MAXX 3.3

DANGER! Model engine fuel

is poisonous to humans

and animals. Drinking the

fuel can cause blindness

and death. Handle with

care and respect. Keep it

out of reach of small

children at all times! While

driving, do not leave your

fuel dispensing bottle on

the ground where a child

could have access to it.

Follow fuel label warnings.

The Fuel

Use the Right Fuel

It’s imperative that you use the correct fuel in your

TRX 3.3 Racing Engine for maximum performance

and engine life. Traxxas Top Fuel™should be used to

ensure correct engine lubrication, performance, and

ease of tuning. Traxxas Top Fuel has been proven in

thousands of engines, so you can count on it every

day for great performance.

Top Fuel is the only fuel which is 100% certified

for use in Traxxas engines.

Traxxas Top Fuel is made with just the right balance of the highest

grade natural and synthetic lubricants to allow excellent throttle

response and the best top-end performance, without sacrificing

long-term durability.

All of the components in the fuel are carefully selected from the

best materials available and then custom blended to match the

metallurgy and temperature characteristics of Traxxas engines.

You may use 10%, 20% or 33% nitro-content fuel. Try to use the same

percentage all the time, avoid switching back and forth between fuels.

We recommend that if you break in your engine on 20% fuel that you stick

with that percentage. If you do move to a higher or lower percentage,

make sure you readjust your fuel mixture to compensate (see below).

Choosing a Nitro Percentage

Acommonly asked question is "what is the difference between 10%, 20%,

and 33% fuels?" Increasing the nitro in the fuel is almost like adding extra

oxygen to the combustion process. It burns more efficiently, improves

combustion, and delivers more power. When increased nitro is used, more

of the other fuel components are then required inside the combustion

chamber to maintain the perfect air/fuel ratio. Therefore, overall fuel

mixtures need to be richened slightly (on the high speed needle, about

3/4 of a turn counterclockwise when changing from 20% to 33%, about

1/2 of a turn counterclockwise when changing from 10% to 20%). This

allows greater fuel flow through the engine and promotes cooler running,

even at the maximum lean settings.

If 33% improves power, then it seems that the highest nitro content

available (beyond 33%) should always be used in the engine. In reality,

there are practical limitations. Engines are designed to run best within a

range of nitro percentages. How the engine is ported, the size of the

combustion chamber and other factors determine how much nitro can be

efficiently used in the engine. The TRX 3.3 Racing Engine responds

exceptionally well to a maximum of 33% nitro, returning cooler temps,

more power, and a smoother throttle response. For those who want to run

higher nitro, 33% Top Fuel is the optimum nitro percentage for the TRX

3.3 Racing Engine. Increasing the nitro beyond 33% can introduce the

need for engine modifications (ports, head shimming, etc.) to avoid

starting and tuning difficulties. There are limits to how much nitro an

engine can effectively use to make more power. Lower nitro percentages

have their own advantages. Nitro is an expensive component in the fuel

so 10% nitro blend is more economical for the sport user. 10% also

provides greater latitude with the needle settings for easier tuning.

When using Traxxas Top Fuel, using higher nitro percentages does not

cause the engine to wear out faster. 33% Top Fuel contains the same

quality lubrication package as 10 and 20% Top Fuel. Some non-Traxxas

high-percentage nitro racing fuels do sacrifice some lubrication in

attempts to increase performance. We urge you to not take chances with

your engine investment and use Top Fuel for consistent performance and

long engine life.

What about Other Fuels?

Can other brands of fuel be used besides Top Fuel? There are other fuels

that can provide satisfactory performance; however there could be long-

term costs in the form of decreased engine performance, loss of tuning

ease, and shorter engine life. Only use fuels that contain both castor and

synthetic oil.

Everyone has an opinion or a claim to make about fuel. The engineering

team at Traxxas has spent years developing TRX Racing Engines. No one

knows more about the specific fuel requirements of Traxxas engines,

than Traxxas engineers. We strongly urge you not to take chances with

your engine investment and use the Traxxas fuel made for the TRX 3.3

Racing Engine.

Handling the Fuel

Follow all directions and warnings on the fuel can.

Keep the fuel tightly capped at all times. Some components in the fuel

can evaporate very quickly and upset the balance of the fuel.

Do not store unused fuel in the fuel dispenser. Immediately return fresh

unused fuel back into the fuel can.

Do not mix old and new fuel. Never mix different fuel brands together.

Store the fuel in a cool dry location, away from any source of heat,

ignition, or combustion.

Read and follow the safety precautions on page 4 in this manual.

The TRX 3.3 Racing Engine

T-MAXX 3.3 •23

Filling the Fuel Tank

Use a fuel dispensing bottle (Traxxas Top Fueler, part#

5001) to put fuel into the T-Maxx’s fuel tank. To fill the

fuel bottle, squeeze the air out, insert the dispenser tip

into the fuel can, and release your grip on the bottle.

As the bottle expands, fuel will be drawn into it.

To fill your model flip up the spring-

loaded cap on the fuel tank, insert

the tip of the fuel bottle, and

squeeze to dispense the fuel. Fill

the tank until the fuel level reaches

the base of the filler neck. Close

the fuel tank lid, making sure it

closes tightly.

Fuel Tank Seal Adjustment

The rubber seal on the fuel tank is important to the function of the engine.

The fuel tank is pressurized by the exhaust system to provide reliable fuel

flow. If the tank lid does not seal properly, an air leak will be created that

can cause your engine to run erratically and be difficult to start. If necessary,

the rubber O-ring tank seal can be adjusted for improved sealing by

tightening the screw on the underside of the tank lid.

The Air Filter

The TRX 3.3 Racing Engine air filter is specifically designed to deliver

maximum performance while protecting your engine from dust and dirt.

Use only the supplied filter. You will not improve engine performance by

switching to an aftermarket filter,and you may risk engine damage due to

poor filtration.

The TRX 3.3 Racing Engine air filter assembly consists of 3 pieces:

1. Arubber filter base.

2. Aplastic housing consisting of a permanently

assembled mesh cap and body.

3. An oiled foam element.

You must clean the filter after every hour of run time, even if the filter

looks clean. This includes the break-in time. Clean your air filter after

break-in. Dust (which is often too fine to see) and dirt constantly move

through the filter anytime the engine is running. Even if you can’t see dirt

on the filter, it is present inside the foam after any amount of run time. If

you exceed the recommended cleaning intervals, your engine will be

damaged. Engine damage or wear due to dirt ingestion is easy

to detect, and one of the top causes of premature engine failure.

Air Filter Cleaning Instructions

1. Remove the air filter from the

carburetor bore by pulling the entire

filter assembly firmly to the side to

release it. Do not pull straight up.

2. Disassemble the filter. Pull the

rubber air filter neck out of the filter

body. With the base removed, the

foam element is visible in the

bottom of the filter body. Pull out

the foam element.

3. Clean the filter parts by thoroughly washing all three pieces of the filter

assembly in hot soapy water (dishwashing detergent works well).

Repeat twice.

4. Thoroughly dry the parts with a clean towel or compressed air.

Remember to wear your safety glasses when working with

compressed air.

5. Oil the foam element with foam filter oil. Use the supplied Traxxas filter

oil (part# 5263) or a high-quality, special-purpose foam filter oil like

what is used for off-road motorcycle and ATV engines.This type of filter

oil is available at motorcycle pro-shops. Apply 30 drops of the Traxxas

filter oil evenly to the top, bottom and sides of the filter element (30

total drops divided among the 3 surfaces). Squeeze the filter element

repeatedly to help spread the oil throughout. The filter element should

be evenly colored by the oil. Even color indicates that the oil is

distributed evenly. Do not squeeze out excess oil.

Note: Do not use the air filter oil for anything other than the air filter.

It is not meant to be a lubricant.

6. Reassemble the filter and install it on the engine, making sure

the rubber filter neck fits securely on the carburetor with no gaps

or air leaks.

The TRX 3.3 Racing Engine

24 •T-MAXX 3.3

See page 32 for more

information on how

air density affects

engine tuning.

The Carburetor

Understanding the Carburetor adjustments

The carburetor performs several functions. It controls the engine’s speed

by restricting the intake of air and fuel into the engine. It atomizes the

fuel (suspends the fuel droplets in the air) and also controls the air/fuel

ratio of the mixture entering the engine (how much air for a given

amount of fuel).

To help provide a better understanding of engine tuning and why it’s

necessary, the following is a brief explanation of the air/fuel combustion

process that takes place inside the engine.

In order to create the cylinder pressure that results in power, the engine

burns the air/fuel mixture. Both air and fuel, in correct amounts, are

needed for proper combustion. It is the carburetor’s job to mix the air

and fuel together (atomize the fuel), in the correct proportion for the

best possible combustion. This is the ideal air/fuel ratio. The ideal air/fuel

ratio required for the engine remains roughly constant. Due to variations

in atmospheric conditions (temperature, humidity, altitude etc.) fuel flow

adjustment valves (called fuel mixture needles) are required to meter the

fuel and maintain the ideal air/fuel ratio in these ever-changing

conditions. For example, colder air is more dense (more air molecules)

for a given volume of air and therefore requires more fuel (more fuel

molecules) to maintain the correct air/fuel ratio. Warmer air is less dense

(fewer air molecules) and therefore needs less fuel to maintain the

correct air/fuel ratio. The tuning needles are there to adjust how much

fuel is made available for the carburetor to mix with the available air

(atomization).

The Fuel Mixture Needles

The amount of fuel metered and atomized by the carburetor is

controlled by the two mixture needles, the high-speed needle and the

low-speed needle. The low-speed needle is used to meter the fuel used

by the engine at idle and low rpm (part-throttle) engine speed. The high-

speed needle is used to meter the fuel when the throttle is open from

part throttle to wide-open throttle (WOT). Two needles on the TRX 3.3

Racing Engine provide precise control of the air/fuel ratio across the

engine’s entire rpm range.

The maximum possible fuel flow is always controlled by the high-speed

needle. It works like the main water valve on a garden hose. Turn it

clockwise to close the valve, counter-clockwise to open it. When the

throttle is at idle or partially open, the low-speed needle meters the fuel

flow at the outlet (needle seat) where the fuel enters the carburetor

venturi. This second valve acts like the spray nozzle at the end of the

garden hose in our example. When you accelerate from idle, the throttle

opens and the low-speed needle is pulled away from the needle seat.

This allows more fuel to flow with the increased air flow. As the throttle

The TRX 3.3 Racing Engine

Air

Fuel

Cold Air (More Dense) (Warm Air) Less Dense

Start 1/8 Turn

45°

Full Turn

360°

1/2 Turn

180°

1/4 Turn

90°

3/4 Turn

270°

A“turn” refers to

tightening (“turning in”) or

loosening (“turning out”)

mixture needles. A “full

turn” refers to turning the

needle 360°, so a “1/2 turn”

would be 180°, a “1/4 turn”

would be 90°, and so on.

T-MAXX 3.3 •25

is increased, the low-speed needle is pulled completely away from the

needle seat leaving it fully open. At that point, fuel metering is entirely

controlled by the high-speed needle. Again, using our water hose

example, when the spray nozzle at the end of our garden hose is fully

open, then the main water valve can be used to adjust how fast the

water flows.

The engine’s performance is directly linked to the fuel mixture.

Richening the fuel mixture increases the amount of fuel in the air/fuel

mixture ratio and leaning the fuel mixture decreases the amount of

fuel in the air/fuel mixture ratio.

Slightly lean fuel mixtures deliver stronger, more efficient

combustion and more power, but with less lubrication.

Slightly rich fuel mixtures deliver cooler running and more

lubrication but with slightly less power.

Tuning the engine means finding the perfect balance between the two;

excellent power to meet your needs while maintaining good lubrication

for long engine life. The optimal fuel mixture setting is rich to provide a

safety margin against having a lean condition if some variable changes

(such as the temperature from one day to the next).

General fuel mixture settings are measured by the number of turns the

needles are turned out from fully closed. The fuel mixture settings have

been pre-set from the factory to typical break-in settings. Do not

readjust your carburetor from the factory settings until after the engine

is started and running, and you have been able to observe the engine

running to assess what minor adjustments may be required to

compensate for fuel, temperature, and altitude. Adjustments are usually

made in 1/8 or 1/16-turn increments. If the engine sticks at TDC, see

page 44 for instructions on freeing the engine.

The Idle Speed Adjustment

The idle speed screw controls the closed position of the throttle slide.

When the throttle servo is in its neutral position, the throttle slide should

be stopped against the idle adjustment screw. Always use the idle speed

adjusting screw to control engine idle. Do not use the throttle trim on

the transmitter to adjust idle speed. The idle speed should be set as low

as possible and still maintain reliable running.

Water Valve

(Controls Overall Flow)

High Speed Needle

Water Nozzle

(Controls Fine Flow)

Low Speed Needle

Richen

Lean Rich

See Tuning Your TRX 3.3

Racing Engine on page 31

for complete information on

adjusting the air/fuel

mixture and idle speed.

Factory Needle Settings

If your factory preset

carburetor adjustments

have been tampered with,

use the following settings:

•Set the high-speed needle

to 4 turns out from closed.

•Set the low-speed needle

so the screw head (red in

Fig. A)is flush (even) with

the end of the slide (yellow

in Fig. A).

Always use the factory

settings for initial starting.

Only use these settings

when the factory settings

have been lost.

Higher nitro requires a

richer fuel mixture. When

running 33% fuel, richen

your high speed needle 3/4

turn if previously running

20% nitro and then re-tune

the engine for maximum

performance.

Low Speed

Needle Adjustment

Fig. A

The TRX 3.3 Racing Engine

26 •T-MAXX 3.3

Use the Right Charger

The most convenient type

of charger is an AC peak-

detecting charger that

plugs directly into an AC

wall outlet, such as the TRX

Power Charger (part

#3030X, see page 12 for

more info). It contains

special peak-detection

circuitry that automatically

shuts the charger off when

the battery is fully charged.

If you’re using a 15-minute

timed charger, always fully

discharge the battery pack

before each charge. Some

high mAh battery packs

(1500 mAh or higher)

require more than the

standard 15 minutes of

charge time. If the battery

pack is cold after 15

minutes of charging, add

another 5 minutes of charge

time. Closely monitor the

battery pack and stop

charging it when it begins

to feel warm to the touch.

Never leave a battery

charging unattended.

Always follow charger

manufacturer’s instructions.

Inexpensive overnight wall

chargers may also be used.

The Traxxas EZ-Start brings the convenience of push-button electric

engine starting to your T-Maxx 3.3. The EZ-Start consists of a hand-held

control unit and an on-board motorized starter.

Power for the EZ-Start system comes from a 7.2-volt rechargeable

battery pack installed in the hand-held control unit (battery

not included).

The engine glow plug is heated automatically by the EZ-Start system,

eliminating the need to keep up with a separate glow plug igniter.

The voltage to the glow plug is kept constant, regardless of the load

placed on the starter by the starter motor.

The “Glow Plug” LED (light emitting diode) on the control unit

indicates glow plug continuity.

The “Motor” LED indicates the status of the EZ-Start electric

starter motor.

The Cush Drive™mechanism in the drive unit prevents damage to the

gears caused by engine kickback.

Smart Start™protection circuitry prevents damage to the motor by

cutting power if the load on the motor or other electronics exceeds

safe limits.

Installing the EZ-Start Battery

The EZ-Start system requires a fully charged 7.2-volt rechargeable NiCad

or NiMH battery pack (not included). Use a charger (not included)

designed for 7.2-volt battery packs. Charge the battery according to the

charger manufacturer’s directions.

1. Press the tab in the end of the battery compartment door to open. (A)

2. Plug a fully charged 7.2-volt battery pack into the connector inside. (B)

3. Twist the battery 2 or 3 times to twirl the battery plug wires. This helps

hold the wire and battery in place when the battery is installed in the

compartment. (C)

4. Install the battery into the compartment and press the wires

securely into place.

5. Snap the battery compartment door back on and lock the end tab. (D)

The Traxxas EZ-Start

™

Electric Starting System

The TRX 3.3 Racing Engine

T-MAXX 3.3 •27

Using the EZ-Start

Your EZ-Start controller plugs into a 4-prong receptacle in the center of

the bed on your T-Maxx 3.3. When the red button on the controller is

pressed, the EZ-Start motor begins to spin the engine and power from

the control unit heats the glow plug. Assuming all settings and

preparations are correct, the engine should start almost immediately.

Each of the two status indicator LEDs on

the hand-held control unit, the Motor

LED and the Glow Plug LED, should

light green while starting. If either LED

fails to light while starting, there is a

fault indicated with that function:

If the Glow Plug LED fails to light,

the glow plug may be bad, or the

glow plug wire may be damaged

or disconnected.

If the Motor LED fails to light and

the starter fails to operate, then the

EZ-Start is in protection mode.

Protection Mode

The EZ-Start uses Smart Start™technology to monitor the condition of

the system and detect failures. The controller monitors the load being

placed on the EZ-Start motor. If the load becomes excessive, the system

shuts off power to the motor to prevent costly damage to the motor and

the controller. This may occur, for example, if the engine floods with fuel

during starting. The starter spins at first but when excessive fuel in the

combustion chamber begins to lock up the engine, the starter motor

slows under the heavier load. This causes the protection circuit to shut

off the power to the motor. Allow at least 3 minutes for the starter motor

to cool and the circuit to automatically reset before continuing. Use the

time to find and eliminate the condition that caused the excessive load

on the starter motor.

Use a Strong Starter Battery

Aweak starter battery, or one that has not been fully charged, may not

deliver enough power to crank the engine over at the appropriate rpm

to keep the piston from sticking at top dead center (TDC). A new engine

will typically have a tight fit between the piston and the top of the

sleeve. This is a tapered fit, and a tight piston sleeve fit on initial startup

is desirable for those who want the best-performing engine. Make sure

you are using a good quality battery pack that is fully charged (new

batteries usually require several charge cycles to reach peak voltage and

full capacity). This is especially important with a new engine that needs

to be broken in. If the engine sticks at TDC, see page 44 for instructions

on freeing the engine.

Shutting Off The Engine

Turning off the switch for the radio will

not shut off the engine. To shut off the

engine, use the shut-off clamp on the fuel

line. Squeeze the clamp closed to shut off

the fuel supply to the engine. Don’t forget

to release it when you restart the engine.

Avoid shutting off the engine by placing your finger over the exhaust

outlet, especially if you are through driving for the day. This will leave

more unburned fuel in the engine that could lead to harmful corrosion.

Always be careful not to touch the exhaust pipe after running, it can

become very hot.

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

PlugPlug

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

When the EZ-Start

controller is in protection

mode, wait at least three

minutes before attempting

to start the engine, to give

the starter motor time

to cool.

It’s normal for your EZ-Start

controller to become warm

after repeated use.

The TRX 3.3 Racing Engine

28 •T-MAXX 3.3

See Important Points to

Remember on page 4 for

other precautions.

Never run your T-Maxx 3.3

indoors. Since the TRX 3.3

Racing Engine exhaust

fumes are harmful, always

run your model outdoors, in

awell-ventilated area.

Your TRX 3.3 Racing Engine

doesn’t usually require

priming. If you do need to

prime your engine, watch

the fuel line carefully to

avoid flooding your engine.

See page 44 for information

on clearing a flooded engine.

Factory Needle Settings:

Your carburetor is preset at

the factory to give the

correct air-to-fuel ratio and

idle speed for engine break-

in. Do not adjust the

carburetor unless you

observe a poor running

condition that requires

correction (see page 25 for

stock settings).

Higher nitro requires a

richer fuel mixture. When

running 33% fuel, richen

your high speed needle 3/4

turn if previously running

20% nitro and then re-tune

the engine for maximum

performance. See page 22

for more information.

Breaking in Your TRX 3.3 Racing Engine

The TRX 3.3 Racing Engine uses a ringless, aluminum-brass-chrome (ABC)

piston/sleeve construction. This type of engine design relies on a very

precise running fit between the piston and sleeve for cylinder sealing.

Engine break-in is necessary to allow the piston and sleeve to develop

an extremely precise fit and optimum cylinder sealing. Therefore,

proper engine break-in is critical to achieving the fastest, most reliable

engine performance.

Allow yourself about 1 to 11/2hours to complete the break-in procedure.

The engine break-in period will take 5 tanks of fuel in a T-Maxx 3.3. The

break-in time is not the time to impress your friends with your new T-Maxx

3.3. You must wait until the engine is fully broken in before attempting

sustained high speed running. Patience and careful attention during

break-in will reward you with the best-performing TRX 3.3 Racing Engine

possible.

During break-in, your engine may appear to malfunction with symptoms

like stalling, inconsistent performance, and fouled glow plugs. These are

simply the normal “break-in pains” engines sometimes go through. They

will disappear once your engine is fully broken in. Many owners report not

experiencing any of these symptoms with TRX Racing Engines. We

recommend to go ahead and replace the glow plug with a new one

after the engine break in procedure.

Engine Break-in Procedure

The focus during break-in is to vary and limit the engine speed. This will

be accomplished by accelerating and stopping at different rates for the

first 5 tanks of fuel. As the engine begins to break-in, the duration and

intensity of the acceleration will gradually increase. Sustained high-speed

running is not permitted until the 6th tank of fuel. Perform the initial

break-in on a large, flat, paved surface. T-Maxx 3.3 is very fast and by

tanks 4 and 5 you will need plenty of room for the truck to run in. Apply

all throttle and braking actions gently. Abrupt acceleration or braking

could cause the engine to stall unnecessarily.

Special break-in fuels are not recommended. Use the same fuel you

plan to use everyday.

If possible, avoid breaking-in the engine on extremely hot or cold days

(see page 30).

Pay careful attention to the fuel level. Do not allow the fuel tank to run

completely empty. An extremely low fuel level causes the mixture to

run too lean. This could result in a burned glow plug or extremely high

engine temperatures.

Do not attempt to break in the TRX 3.3 Racing Engine by idling it on a

stand. This will produce poor results.

Keep extra Traxxas glow plugs handy. The break-in process can cause

deposits to form on the plug leading to plug failure.

Change or clean your air filter after break-in.

Follow the instructions exactly for each of the first 5 tanks of fuel.

Starting Your TRX 3.3 Racing Engine for the First Time

Before you start your TRX 3.3 Racing Engine for the first time, make sure

you have read all instructions and precautions in this manual. Pay close

attention to the tank-by-tank break-in instructions in the next section,

and make sure you have read and understood them before you run

your engine.

Your engine must be at room temperature (70°F or 21° C) or above the

first time you start it.If it’s cooler than room temperature outside, remove

all fuel and keep your T-Maxx 3.3 indoors until you’re ready to start it and

then take it outside. If it’s colder than 45 degrees, special considerations

should be made. See cold weather break-in on page 30. We do not

recommend running the model in temperatures below 35 degrees.

1. Turn on the radio system (see page 16).

2. Make sure the throttle trigger on the

transmitter is in the idle (neutral) position.

3. Connect the EZ-Start controller according to

the instructions on page 27.

4. Press the starter button in short two second

bursts and watch for fuel moving through the

fuel line up to the carburetor. Watch closely!

The fuel moves very fast. If the fuel doesn’t move through the line

within 5 seconds, prime the engine by briefly (one or two seconds)

covering the exhaust outlet with your finger until the fuel is just visible

in the carburetor fuel line. Watch carefully! If the engine is primed too

long, it will flood with fuel and stop turning.

5. Once fuel reaches the carburetor, the engine should

quickly start and idle.

6.Disconnect the EZ-Start controller from the model.

7.Proceed with the engine break-in.

8.Do not rev your engine with no load (wheels off the ground).

If your engine doesn’t start, refer to the troubleshooting tips beginning on

page 43 or go online to www.traxxas.com/support. If your factory fuel

mixture settings have been altered, refer to page 25. If you still have

problems, contact Traxxas Customer Support at 1-888-TRAXXAS or

support@traxxas.com.

The TRX 3.3 Racing Engine

T-MAXX 3.3 •29

High Altitude Operation:

If you live in a high

altitude region (5000 or

more feet above sea level),

the lower air density may

require you to lean your

high-speed fuel mixture

slightly from the factory

break in settings. Try this

if you are experiencing

difficult starting or

extremely sluggish

engine performance at

high altitude.

As you gain experience in

the hobby, you may

discover that many people

have differing opinions on

what is the proper

procedure to break-in a

model engine. Only use the

Traxxas break-in procedure.

Other break-in procedures

could result in a weak,

damaged, or otherwise poor

performing engine. The

procedure outlined here

was extensively tested and

proven to yield better

performing engines than

other “common” break-in

methods. Even if you have

years of experience using

model engines, please do

not ignore this caution!

Tank

Throttle

1/4

1/2

Full

Time

2Seconds

3Seconds

5Seconds

Cool

15 Minutes

Body

Off

Notes

Apply throttle gradually.

Reduce idle speed if necessary.

Do not allow shifting to high gear.

Accelerate over 3 second count, hold for 2 seconds.

Note: The wheelie bar is installed in the “down” position to help keep the

front of the T-Maxx 3.3 down during acceleration. Apply throttle gradually

to prevent wheelies during break-in. See page 40 for wheelie bar

adjustment.

Tank 1

1. Drive the model with the body off.

2. Driving procedure: Gently pull the throttle trigger to 1/4 throttle over

a2-second count. Then gently apply the brake to stop.Count the two

seconds out while accelerating: one thousand one, one thousand two,

and then stop. Operate the throttle trigger as smoothly as you can.

Repeat this starting and stopping procedure until the first tank of

fuel is nearly empty.

3. Look for thick blue smoke exiting the exhaust outlet. If there is

no smoke, richen the high-speed needle 1/4 turn, by turning the needle

counterclockwise.

4. When the fuel tank is nearly empty, shut off the engine by pinching the

fuel line connected to the carburetor (use the installed clamp).

5. Let the engine cool for 15 minutes.

Note: If at any point the engine cuts out or stalls during gentle

acceleration, richen the high-speed needle 1/4 turn by turning the needle

counterclockwise.

Tank 2

1. From tank 2 forward, T-Maxx 3.3 should be driven with the body on.

2. Driving procedure: Gently pull the throttle trigger to 1/2 throttle over

a2-second count. Then gently apply the brake to stop. Count the two

seconds out while accelerating: one thousand one, one thousand two,

and then stop. Repeat this starting and stopping procedure until the

second tank of fuel is nearly empty.

3. When the fuel tank is nearly empty, shut off the engine and let it cool

for 15 minutes.

Tank 3

1. Driving procedure: Gently pull the throttle trigger to 1/2 throttle over

a3-second count. Then gently apply the brake to stop. Count the

three seconds out while accelerating: one thousand one, one thousand

two, one thousand three, and then stop. Repeat this starting and

stopping procedure until the third tank of fuel is nearly empty.

2. As the engine loosens, the idle speed may increase and cause

the model to try to creep forward when stopped. Reduce the

idle speed by turning the idle adjustment (see page 19) on the

carburetor counterclockwise.

3. When the fuel tank is nearly empty, shut off the engine and refuel.

From here on, you do not need to let the engine cool between tanks.

Tank 4

1. Driving procedure: Gently pull the throttle trigger to full throttle over

a3-second count. Then gently apply the brake to stop. Count the

three seconds out while accelerating: one thousand one, one thousand

two, one thousand three, and then stop. Repeat this starting and

stopping procedure until the fourth tank of fuel is nearly empty.

2. Apply the throttle gradually! Your finger should not reach full throttle

until the end of the three-second count. T-Maxx 3.3 may try to shift into

second gear. If it does, reduce the throttle input. Do not let T-Maxx 3.3

shift out of first gear.

3. Keep your driving smooth and consistent.

4. When the fuel tank is nearly empty, shut off the engine and refuel.

Tank 5

1. Driving procedure: Gently pull the throttle trigger to full throttle over

a3-second count, hold for 2 more seconds, and then gently apply

the brake to stop. Count the five seconds out while accelerating.

Repeat this starting and stopping procedure until the fifth tank of

fuel is nearly empty.

2. The model should now be shifting into second gear. If it is not, try

turning the high-speed needle clockwise 1/8 turn to lean the fuel

mixture slightly and test for shifting.

3. When the fuel tank is nearly empty, shut off the engine and refuel.

Tank 6

STOP! Clean your air filter before you proceed. Refer to the instructions

on page 23. During the sixth tank of fuel, the engine can be tuned

for general performance use. Proceed to the next section in this manual

(page 31).

The TRX 3.3 Racing Engine

30 •T-MAXX 3.3

Winter Break-in Tips

During the break-in process, the piston and sleeve wear into each other

to form a precise fit. The engine needs to heat up to a temperature

around 200 to 215 degrees to allow the piston and sleeve to achieve this

fit properly. A precise fit between these two components is critical for

proper compression, and optimum performance. If the engine runs too

cold during break-in, the piston and sleeve will not expand to their

appropriate sizes for break-in, and this can lead to premature wear of

these components. This wear may not become apparent until after winter

has past, and the engine is operated under warmer running conditions.

Warm the engine to approximately room temperature by removing

all fuel and storing the vehicle inside at room temperature until just

before starting the engine. An extremely cold engine can become

difficult to start.

After the engine is running, it is important to keep the temperature of

the engine up around 200 to 215 degrees during break-in. In weather

below 45 degrees, the TRX 3.3 Racing Engine will tend to run at lower

temperatures between 160 to 180 degrees (when tuned at proper

break-in mixture settings). This is too cool for break-in. Do not lean the

fuel mixture to increase engine temperature! This will also decrease

lubrication and cause your piston/sleeve to wear prematurely.

Wrap the cooling head with a paper

towel, clean rag or sock to help keep

the engine running around the

recommended 200 to 215 break-in

temp. If too much heat is contained,

the engine can actually run too hot.

Make sure that you monitor the

engine's temp closely for the first

couple of tanks until you get the right

amount of cover for the cooling head. This will, of course, depend on

your current weather conditions. Adjusting the cover up and down,

exposing more or fewer cooling fins, is a convenient way to regulate

engine temps.

For owners that do not have access to a temperature probe, a drop of

water on the cooling head (around the glow plug area) should slowly

sizzle for approximately 6 to 8 seconds around 200 to 210 degrees. If

the water sizzles for only a few seconds, then it is likely that it is over

220 degrees, and needs to cool down. If the water takes a long time or

does not evaporate at all, then the engine is too cool.

We do not recommend that you operate your engine below 35

degrees Fahrenheit. If you insist on running your vehicle below 35

degrees, be aware that nitro engines may be very difficult to start and

tune at extremely cold temperatures. Also, at temperatures below

freezing, nitro fuel can actually begin to gel up, and this can be

harmful to the engine.

Follow the remaining break-in procedures as outlined in this Owners

Manual. This, along with the steps listed above, will ensure a good break-

in for your new nitro engine, and provide many hours of enjoyment.

The TRX 3.3 Racing Engine

T-MAXX 3.3 •31

Tuning Your TRX 3.3 Racing Engine

The engine’s performance depends on the fuel mixture. Turn the mixture

needles clockwise to lean the fuel mixture and counterclockwise to

richen it. Leaning the fuel mixture will increase engine power up to the

engine’s mechanical limits. Never run the engine too lean (not enough

fuel flow). Never lean the engine until it begins to cut-out or stall.

Leaning the engine beyond the safe allowable limits will result in poor

performance and almost certain engine damage. Indications of an

overly lean mixture include:

Cutting out or sudden loss of power during acceleration.

Overheating (temperature beyond 270° F at the glow plug).

Little or no blue smoke coming from the exhaust.

If any of these conditions are present, stop immediately and richen the

high speed mixture 1/4 turn. The engine will probably be slightly rich at

that setting and you can then retune for performance. Always tune for

performance by starting rich and moving leaner toward the ideal setting.

Never try to tune from the lean side. There should always be a light

stream of blue smoke coming from the exhaust.

Before you begin tuning, the engine should be warmed up to its normal

operating temperature and running slightly rich. All final tuning adjustments

must be made to the engine at its normal operating temperature. You can

tell the engine is running rich by noting any of the following:

Sluggish acceleration with blue smoke coming from the exhaust.

T-Maxx 3.3 may not shift into second gear.

There is unburned fuel spraying from the exhaust tip.

Leaning the high-speed fuel mixture increases performance.

High-Speed Fuel Mixture Adjustment

With the engine warm and running at a rich setting, gradually lean the

high-speed fuel mixture in 1/16 turn increments. Make several high-

speed passes after each adjustment to clear out the engine and note any

change in performance. The TRX 3.3 is extremely powerful. Remember to

apply the throttle gradually to prevent wheelies or loss of control.

Continue this procedure until there is no longer any performance

improvement. If any one of the following conditions occurs, the fuel

mixture is already past the maximum safe lean setting:

1. There is no longer any performance improvement.

2. The engine begins to cut out at high speed (Danger!).

3. There is a sudden loss of power during acceleration (Danger!).

4. The engine begins to overheat. Symptoms of overheating include:

Steam or smoke coming from the engine (not exhaust).

Hesitation or stalling during acceleration.

Popping or clattering sound when decelerating (detonation).

Fluctuating idle speed.

Temperature measurement above 270° F at the glow plug

(A temperature reading above 270° alone does not necessarily

indicate overheating. Look for other symptoms of overheating

combined with temperature for a more accurate warning).

Richen the fuel mixture to the optimum setting by richening the high-

speed needle at least 1/8 turn counterclockwise and retest. This setting

will extend engine component life.

When tuning for

performance, watch closely

to notice when there is no

longer any increase in speed

or power when the

high-speed mixture is lean.

If you lean the high-speed

mixture to the point that the

engine cuts-out, hesitates,

or stalls, you are well into

the danger zone and engine

damage is likely. Richen the

high-speed needle 1/4 turn

and retune.

For your convenience, the

low-speed needle has a

positive stop that prevents

it from being over tightened

and damaging the needle

and seat. This also provides

an easy way to gauge how

many turns out from closed

the low-speed needle

adjustment is set to.

The TRX 3.3 Racing Engine

32 •T-MAXX 3.3

When adjusting the low

speed fuel mixture, it is

very important to make

several high-speed runs

with T-Maxx 3.3 between

adjustments to clear out

any excess fuel. Perform

the pinch test immediately

after. If the engine is

allowed to idle for a long

period of time, it could

“load up” with fuel and

give you an inaccurate

measurement from your

pinch test.

Higher nitro requires a

richer fuel mixture. When

running 33% fuel, richen

your high speed needle 3/4

turn if previously running

20% nitro and then re-tune

the engine for maximum

performance. See page 22

for more information

Low-Speed Fuel Mixture Adjustment

The low-speed mixture is always set after the high-speed needle is

correctly adjusted. The low-speed mixture is set using the pinch test.

1. Once the engine is warm, do several high-speed runs to confirm

that the high-speed needle is set correctly.

2. Bring the vehicle in and pinch closed the fuel line going into the

carburetor (use the engine shut-off clamp). The engine should run

for 2-3 seconds, speed up, and then shut off.

3. If the engine runs longer than 3 seconds, then lean the low-speed

needle 1/16 turn, make several more high-speed runs, and retest.

4. If the engine shuts off immediately without speeding up, then richen

the low-speed needle 1/8 turn, make several more high-speed runs,

and retest.

When the low-speed needle is set correctly, the engine’s throttle

response should be very quick, even to the point of making it difficult to

keep T-Maxx 3.3 from doing a wheelie when you accelerate!

Idle Speed Adjustment

Once the high and low-speed mixtures have been set, reduce the idle

speed to the minimum reliable idle speed. Remember, this adjustment

should be made while the engine is running at normal operating

temperature.

1. Turn the throttle trim on the transmitter so the brakes are

applied (note its original position). This ensures that the throttle

slide is resting against the idle adjustment screw.

2. Turn the screw counterclockwise to reduce the idle speed, or

clockwise to increase it. The idle speed should be set as low as

possible while still maintaining reliable running characteristics.

3. Reset the throttle trim on the transmitter to its original position.

The TRX 3.3 Racing Engine

is..

Lower

Higher

Lower

Higher

Lower

Higher

Lower

Higher

Lower

Higher

then the air density is...

Slightly more dense

Slightly less dense

Less dense

More dense

Less dense

More dense

Less dense

adjust (correct) the

fuel mixture to be...

Slightly richer

Slightly leaner

Leaner

Richer

Leaner

Richer

Leaner

Richer

If the...

Humidity

Pressure (barometer)

Temperature

Altitude

Nitro %

Fuel Mixture Adjustment Chart

T-MAXX 3.3 •33

Fine-Tuning the Carburetor

After fine-tuning your TRX 3.3 Racing Engine at the end of the break-in

procedure, no major adjustments to the fuel mixture are usually

necessary. Make note of the temperature, humidity, and barometric

pressure at the time you finished fine tuning your carburetor. Current

weather conditions can be found online from national websites, local TV

news websites, and television. This information will be considered your

baseline setting.

You may need to adjust your carburetor needles to compensate for

changes in temperature and barometric pressure (air density) from day

to day. Generally, you’ll need to richen the fuel mixture when the

weather is colder than your baseline temperature and the air density is

higher. Lean the fuel mixture when weather is warmer than your

baseline temperature and the air density is lower. The chart below

provides general guidelines on how weather conditions affect air density

when they move higher or lower than your baseline setting (see page 24

for detailed info on how air density affects mixture settings).

Tuning the Engine by Temperature

The following procedures require an

optional infrared temperature probe or

on-board temperature gauge (Traxxas

on-board digital temperature gauge, part

#4091). Engine temperature can be used as

an effective tuning aid when you

understand the relationship between

engine temperature and ambient temperature. The engine operating

temperature, when tuned for maximum performance, will vary according

to atmospheric conditions, engine load, gauge accuracy, and many other

factors. The atmospheric condition that has the most influence on engine

temperature is air temperature. Expect the engine temperature to vary

almost in direct proportion to air temperature. Assuming you tuned the

engine for the same maximum performance each day, the engine will run

about twenty degrees hotter when it’s ninety degrees outside than it

would in seventy-degree weather. For this reason, we cannot give

you a definitive temperature range that indicates the best possible

engine tuning.

There is NO optimal temperature that can be used as a target to deliver

the best engine tuning. Do not rely on a temp gauge alone to tune

your engine. Tune the engine by paying very close attention to how it

responds to changes in fuel mixture (more smoke/less smoke,

fast/sluggish, reliable/stalling, smooth sound/ muffled sound, etc).

Once the engine is tuned, then observe the temperature.

The temperature gauge can aid you in tuning by giving you a relative

indication of how your adjustments are affecting the engine and to help

prevent you from reaching excessive engine temperatures. For example,

as you lean the fuel mixture, the engine performance will increase along

with the temperature. If you continue to lean the fuel mixture and the

temperature increases but the engine performance does not change,

then you have exceeded the maximum safe lean setting. Make note of

the engine temperature. Generally, try to keep your engine from

exceeding 270°F when measured at the glow plug. If necessary, increase

airflow to the engine by cutting out the rear of the body, windshield, and

front valance. In some situations, the engine may perform very well with

no stalling, lagging, or hesitation at temperatures above 270°F,

particularly in very hot climates. If richening the fuel mixture to bring the

temperature down to 270°F results in poor, sluggish performance (engine

never cleans out) then return the engine back to a satisfactory state of

tune based on how it sounds and performs (always with a visible stream

of blue smoke coming from the exhaust). If engine temperature is

exceeding 270°F with proper cooling and no signs of abnormal running,

then avoid running the engine at its maximum lean setting. Watch

closely for any signs of overheating. Richen the fuel mixture slightly to

provide a safety margin of additional cooling lubrication.

Symptoms of

overheating include:

Steam or smoke coming from the engine (not exhaust).

Hesitation or stalling during acceleration.

Popping or clattering sound when decelerating (detonation).

Fluctuating idle speed.

The TRX 3.3 Racing Engine

34 •T-MAXX 3.3

Introduction

Your TRX 3.3 Racing Engine is broken in, the fuel mixture is balanced,

and the idle is set…now it’s time to have some fun! This section contains

instructions on making adjustments to your T-Maxx 3.3. Before you go

on, here are some important precautions to keep in mind.

Don’t run your T-Maxx 3.3 in water, mud, snow, or wet grass. It’s

tempting, but water and mud are easily drawn through the air filter

and will severely damage the engine. Small amounts of moisture can

cause electronics to fail and loss of control over your T-Maxx 3.3.

Snow is frozen water. Do not drive the T-Maxx 3.3 in snow or the

electronics could be damaged by water.

The TRX 3.3 Racing Engine is extremely powerful. Remember to apply

the throttle gradually to prevent loss of control. T-Maxx 3.3 is very fast

and responsive and is intended for experienced drivers. Do not drive

over the limits of your reflexes and ability. Drive with caution at all

times and gradually build up your ability to maintain control at

T-Maxx 3.3’s upper performance limits.

Don’t hold T-Maxx 3.3 off the ground and rev the engine excessively

with no load on the engine. This practice could result in internal

engine damage. Avoid over revving the engine when T-Maxx 3.3 is

airborne after a jump.

Avoid excessive high-speed running for extended periods of time or

over long distances. This could cause the engine to build up enough

speed to exceed maximum safe rpm limits.

Don’t drive your T-Maxx 3.3 with drive train damage of any kind. The

engine could be damaged due to overloads caused by drivetrain

friction, or over-revving caused by loose or missing parts.

Don’t tow anything with your T-Maxx 3.3. The engine is cooled by

airflow created by speed. Towing creates a high load on the engine, and

at the same time limits cooling of the engine due to low vehicle speed.

If your T-Maxx 3.3 gets stuck, stop driving immediately. Move the

vehicle and then continue driving.

Never turn off the radio system while the engine is running. The truck

could run out of control.

Forward and Reverse Operation

Forward and reverse gears are

selected with the shift button

located in the transmitter handle

grip. The switch is normally in the

down, or forward, position.

To shift into reverse, bring your

T-Maxx 3.3 to a complete stop

and push the shift button up.

Accelerate to engage the gear.

To return to forward gear, repeat the same procedure but move the

shift button down.

T-Maxx 3.3 will not shift between forward and reverse unless the

truck is stopped. If it will not shift, then refer to the troubleshooting

section on www.Traxxas.com or call Traxxas support.

Driving Tips

Monster trucks by design have a high center of gravity that requires a

different driving technique. To prevent rollovers, slow down as you

approach turns and then apply moderate throttle through the turns.

This technique will help T-Maxx 3.3 grab the surface and turn sharper.

Do not apply brakes and turn the wheel at the same time. You could

tip the truck over.

When jumping, apply some throttle while T-Maxx 3.3 is in the air to

keep the truck’s nose up and land level on all 4 wheels. Be careful not

to over-rev the engine or land at full throttle. Either could seriously

damage your T-Maxx 3.3. If the nose of the truck is too high, then

quickly tap the brake to level the truck in the air.

Drive over large obstacles (such as curbs and rocks) at an angle,

instead of head on. This will allow the suspension to articulate and

absorb the impact much easier.

Even though T-Maxx 3.3 is capable of high speed in reverse, it is very

difficult to control while driving in reverse. Limit your reverse speed

to prevent crashing or flipping your T-Maxx 3.3.

Change or clean your air filter element after each hour of running.

This is critical for the life of your engine. Running time includes the

engine break-in period.

CH.3CH.2CH.1

ACCELERATE BRAKE

NEUTRAL

CH.3 CH.2 CH.1

SHIFT

REVERSE

SHIFT

FORWARD

Driving Your T-Maxx 3.3

T-MAXX 3.3 •35

Tuning Adjustments

Suspension Tuning

Adjusting the Pivot Ball Caps

The pivot ball caps should be adjusted

so that the pivot balls operate freely in the

axle carriers with no excess play. Use the

provided four-way suspension multi-tool

to tighten or loosen the pivot ball cap.

Caster Adjustment

The T-Maxx 3.3 offers the ability to adjust the caster angle of the front

suspension. Caster adjustment may be used to influence the understeer/

oversteer handling characteristics of the T-Maxx 3.3. Increasing the caster

angle will increase the tendency of the truck to oversteer (less traction on

the rear tires, more traction on the front tires), while decreasing the caster

angle will cause the truck to have a tendency to understeer (push in the

turns). This effect becomes more pronounced at higher steering angles and

higher spring rates. Caster is adjusted by repositioning the shims on the

pivot point of the upper suspension arms.

The stock caster setting is 7-degrees with one shim at each end of the arm.

Reduce the caster angle to 4-degrees by removing the rear shim and

inserting it next to the front shim. The caster angle can be increased to 10-

degrees by removing the front shim and inserting it next to the rear shim.

Fine Tuning the Shocks

The eight shocks (oil dampers) on your T-Maxx 3.3 have tremendous

influence on its handling. Whenever you rebuild your shocks, or make any

changes to the pistons, springs or oil, always do it carefully and in sets (front

or rear). Piston head selection depends on the range of oil viscosities that

you have available. For example, using a two-hole piston with lightweight oil

will give you the same damping as a three-hole piston with heavier oil.

We recommend using two-hole pistons with a

range of oil viscosities from 10W to 40W

(available from your hobby shop). The thinner

viscosity oils (30W or less) flow with less

resistance and provide less damping, while

thicker oils provide more dampening. Use only

100% pure silicone shock oil to prolong seal life.

From the factory, the T-Maxx 3.3 uses 30W oil.

The ride height for the T-Maxx 3.3 can be

adjusted by adding or removing the clip-on

spring pre-load spacers. Note that changes in ride

height will occur when changes in shock angle or

spring rates are made. You can compensate for

ride height changes by changing the pre-load

spacers on the shocks

Shock Mounting Positions

Big bumps and rough terrain require a softer suspension with the

maximum possible suspension travel and ride height. Racing on a

prepared track or on-road use requires a lower ride height and firmer, more

progressive suspension settings. The more progressive suspension settings

help reduce body roll (increased roll stiffness), dive during braking, and

squat during acceleration.

Upper shock mounting position (A)

should generally be used with lower

shock mounting positions 1 and 2.

Upper shock mounting position (B)

should be generally be used with

lower shock mounting positions 3

and 4. The innermost upper shock

mounting position (0) can be used

for tuning with the inner pair of

lower shock mounting positions on

the arm (1,2). It is not compatible

with lower shock mounting positions

3and 4. Other combinations may be

used to achieve individualized

suspension settings.

Caster adjustment shims (1 Front, 1 Rear)

Caster adjustment shims (2 Front) Caster adjustment shims (2 Rear)

Vertical

Ground plane

Vertical

Ground plane

Vertical

Ground plane

For easier access to the

rear-most shock mounting

screw, remove the one end

of the rear turnbuckle. In

the front, remove the

suspension pin from the

lower front suspension arm

to gain easier access to the

lower shock mounting

screws.

36 •T-MAXX 3.3

2.5

1.5

0.5

0 10 20 30 40 60 70 80 90 100 50

Wheel Force (lb)

Wheel Travel (mm)

Wheel Force vs. Wheel Travel

Lower Mount 1, Upper Mount 0

Lower Mount 2, Upper Mount 0

Lower Mount 1, Upper Mount A

Lower Mount 2, Upper Mount A

Lower Mount 3, Upper Mount A

Lower Mount 4, Upper Mount A

Lower Mount 1, Upper Mount B

Lower Mount 2, Upper Mount B

Lower Mount 3, Upper Mount B

Lower Mount 4, Upper Mount B

Less Firm

More Firm

Lower Mount 4

Lower Mount 3

Lower Mount 2

Lower Mount 1

Lower Shock Mounting Positions

In the out-of-the-box configuration, the shocks are installed in position (A)

on the shock tower and position (2) on the lower suspension arm. This

setting allows for firm suspension and low ride height, increasing the spring

force (at the wheel). This setting improves high-speed cornering on

smoother terrain by lowering the center of gravity. Body roll, brake dive,

and squat are also reduced.

The inner pair of holes on the lower suspension arm should

be used to increase the ride height of the T-Maxx 3.3. The more vertical

position of the shocks will allow for lower shock progression and the soft,

plush feel that’s characteristic of a Traxxas Maxx Truck.

Spring rate (at the wheel) increases as the lower shock mounting position

is moved from position (1) to position (4). This is equivalent to using stiffer

springs. Use higher spring rate settings for flatter terrain with smaller and

fewer bumps, and lower spring rate settings for bigger bumps.

Ride height decreases as the lower shock mounting position is moved

from position (1) to position (4). Each pair of lower shock mounting holes

(1,2 and 3,4) has equal ride height. Use lower ride height for high-speed

cornering and flat terrain, and when racing on relatively smooth tracks.

Increase the ride height for rougher terrain and tracks.

Upper Shock Mounting Positions

The upper shock mounting positions will have suspension effects opposite

from the lower shock mounting positions.

Spring rate (at the wheel), increases as the upper shock mounting position

is moved from position (A) to position (B).

Ride height is not affected by changes in the upper shock mounting

position.

Use the chart below to see the effect of the various shock mounting

positions. The horizontal length of the lines indicates the amount of

suspension travel. The angle or slope of the lines indicates the spring rate

(at the wheel).

Tuning Adjustments

T-MAXX 3.3 •37

Alignment Settings

Adjusting the Toe-in

Your T-Maxx 3.3 comes from the factory

with zero degrees of toe-in in the front,

and one degree of toe-in in the rear. You

can adjust the toe-in on the front and rear

of the truck. Set the steering trim on your

transmitter to neutral. Next, adjust your

steering turnbuckles so that both front

wheels are pointing straight ahead and

are parallel to each other (0 degrees toe-

in). This will ensure the same amount of

steering in both directions. Adjust the rear

toe control links so that the rear wheels

have 1˚ of toe-in.

Static Camber Adjustment

The wheels can be set to have either positive or

negative camber (see illustration below). The

camber angle changes as the wheel moves up and

down through its range of travel. Static camber is

the camber angle at the wheel when the vehicle is

set at its normal, stationary ride height.

The suspension pivot balls located in the axle

carriers adjust the static camber. The pivot balls

are protected by blue dust plugs. To adjust your

static camber, insert the supplied 2.5mm hex wrench through the slit in

the dust plug and engage the end of the pivot ball (compressing the

suspension until the arms are parallel to the ground will allow for easier

hex wrench engagement). The upper pivot ball is normally screwed all

the way in. Negative camber is achieved by screwing the pivot ball of the

lower control arm out. Note: When camber is changed, the toe angle of

the wheel has to be reset.

Static Camber Base

Factory Settings

Front: 1-degree negative

camber each side

Rear: 1-degree negative

camber each side

Transmission Tuning

Adjusting the Slipper Clutch

Your T-Maxx 3.3 is equipped with an

adjustable Torque Control slipper

clutch. The slipper clutch is integrated

into the main spur gear on the

transmission (see page 6). The slipper

clutch is adjusted using the spring-

loaded locknut on the slipper shaft.

Use the supplied 8mm open-end

metric wrench. To tighten or loosen the slipper nut, insert the 2.0mm

hex wrench into the hole in the end of the slipper shaft. This locks the

shaft for adjustments. Turn the adjustment nut clockwise to tighten (less

slippage) and counter-clockwise to loosen (more slippage). The slipper

clutch has two functions:

1. Limiting the engine’s torque output to the wheels to prevent

wheelspin on low traction surfaces and help to prevent damage

to the gears in the transmission during on-throttle landings.

2. Protecting the drivetrain from sudden impact or shock loads (such as

landing from a jump with the engine at full throttle).

From the factory the slipper clutch is set for minimal slippage, just

enough to protect the drivetrain from shock loads. On slippery, low

traction surfaces such as a hard-packed, dry racetrack you may benefit

from loosening the slipper adjustment nut to allow for more clutch

slippage. This will make the truck easier and more forgiving to drive by

helping to reduce the amount of wheel spin. Loosening the slipper

adjustment can also improve performance on extreme high traction

surfaces by preventing the front end from lifting off of the ground when

accelerating. Make slipper adjustments in small 1/8 turn increments.

The maximum tight setting for the slipper is just at the point where

there is little or no tire slippage on a high traction surface such as

concrete or a prepared racetrack. The slipper should not be tightened to

the point that clutch slippage is completely eliminated. Do not

overtighten the slipper nut or you could damage the slipper bearings,

pressure plates, or other components.

All of the toe links are

installed on the truck so that

the left hand thread

indicators point to the same

direction. This makes it easier

to remember which way to

turn the wrench to increase

or decrease toe link length

(the direction is same at all

four corners). Note that the

groove in the hex indicates

the side of the toe link with

the left-hand threads.

Front of Truck

Left Hand Thread

Indicator

Front of Truck

Left Hand Thread

Indicator

Left Side

Right Side

Tuning Adjustments

Positive Camber Negative Camber

Left Hand

Threads

Right Hand

(Normal) Threads

Decrease

Length

Increase

Length

38 •T-MAXX 3.3

Adjusting the Two-Speed Transmission

T-Maxx 3.3 comes equipped with an adjustable two-speed transmission.

When the shift point on the transmission is adjusted correctly, it will

maximize acceleration and improve drivability. Use a 2mm hex wrench

to adjust the shift point. To make the adjustment, the engine must be off

(not running).

1. Shift the transmission into forward gear

(shift button down).

2. Remove the rubber access plug from the

top of the transmission housing.

3. While looking through the

opening, rotate the spur gear to

align the cutout (notch) on the internal

2-speed clutch drum with the opening.

4. Hold the spur gear and slowly roll the

truck forward until the hex on the black

adjustment set screw becomes visible in

the opening. Note: the truck will only roll

forward (not backwards) when the spur

gear is held stationary.

5. Insert the 2.0mm hex wrench

through the clutch drum and into

the adjustment screw.

6. Turn the adjustment screw 1/8 turn

counter clockwise to lower the shift

point (shifts sooner). Be careful not to

loosen the adjustment screw too much

or you may cause the screw and spring

to fall out (requiring major disassembly

and repair). Turn the adjustment screw

clockwise for later shifts.

7. Reinstall the rubber access plug to prevent dirt from entering the

transmission. Do not put oil or other lubricants into the transmission

through the two-speed adjustment access.

8. Check performance by running a test lap after each adjustment. On a

small race track with many tight turns, try setting the shift point later so

that the truck only shifts into second gear on the main straightaway.

This will prevent an unexpected shift in the middle of a turn. On larger

tracks it may be necessary to allow earlier shifts for increased speed.

Adjusting the Spur Gear/Clutch Bell Gear Mesh

The ideal spur gear/clutch bell gear mesh

for T-Maxx 3.3 is 0.1mm. To set the gear

mesh, place a strip of standard letter/A4 size

copy or printer paper (about 0.1mm thick)

between the mating teeth. Loosen the four

engine mount screws from the bottom side

of the chassis (see image) and slide the

engine mount up to push the clutch bell gear

against the spur gear so the paper is not too

tight to pull out or too loose that it will fall out.

Tighten the engine mount screws securely.

When the paper is removed, you should feel

only the slightest amount of play between the

gears (almost none) and there should be no

binding or friction.

Changing the Spur Gear

1. Remove the four cap head screws that secure

the engine to the engine mount.

2. Remove the button head screw that secures the

pipe hanger to the rear body mount (see inset).

3. Carefully remove the engine and exhaust system

from the spur gear area to allow enough room to

remove the spur gear.

4. Remove the three screws on the slipper clutch assembly using a 2.5mm

hex wrench. Slide the spur gear off of the slipper shaft. If the spur gear

is too tight on the shaft, gently pry on the back of the gear with a flat

screw driver to loosen it.

Repeat the above steps in reverse order to install the new spur gear

Adjusting the Gear Ratio

The gear ratio on T-Maxx 3.3 can be adjusted for different conditions

that may require either increased acceleration or increased top speed.

Adjusting the gear ratio is accomplished by changing the clutch bell on

the engine and/or the spur gear (slipper clutch gear) on the

transmission. From the factory, T-Maxx 3.3 is equipped with a 22-tooth

clutch bell and a 54-tooth spur gear. This combination will provide a

good balance of acceleration and top speed. Optional spur gears and

clutch bell gears are listed on your parts list. Refer to the chart on page

39 for possible gearing combinations

Shift

Sooner

Two Speed Adjustment

note: If the truck will not roll

forward while the spur gear

is held, the transmission

may still be in reverse gear.

Tuning Adjustments

Counter-

Clockwise

T-MAXX 3.3 •39

Tuning Adjustments

Adjusting the Two-Speed Ratios

T-Maxx 3.3 is equipped to allow adjustment to the 2-speed by installing

optional close and wide-ratio gearsets. This requires transmission removal

and disassembly (see www.Traxxas.com for detailed instructions). The

close ratio gearsets will reduce top speed slightly but will provide more

powerful acceleration by reducing engine rpm loss when shifting from 1st

gear to 2nd gear. The wide ratio gear set is designed for wide open areas

and will increase top speed, but reduce acceleration due to greater rpm

loss when shifting gears.

The following gear ratio chart shows the available combinations with

optional spur gears, clutch bells, and two-speed gear sets.

Brake Setup & Adjustment

T-Maxx 3.3 is equipped with a disc brake that rides on the yoke of the

transmission’s front output shaft. The brake is preset at the factory and

should not require attention. As the brake material wears, future

adjustments may be necessary.

Brake Shoulder Screw Adjustment

The two shoulder bolts that are used to secure the brake pads to the

transmission housing may need to be adjusted periodically as the brake

material wears down. They should be tightened so a 0.50mm (.020") gap

exists between the disc and the brake pad (on the transmission side).

Adjust in one of the following ways:

1. Use a .50mm feeler gauge

between the brake pad insert

and brake disc.

2. Push the outer brake pad firmly

against the inner pad with your

finger, sandwiching the brake

disc between the brake calipers. Tighten the brake shoulder bolts until

they just barely touch the brake pads. Do not over tighten these

fasteners or you could damage the brake calipers. Loosen each of the

shoulder bolts by 1 turn.

Brake Pad Wear and Replacement

During normal use the brake pads should wear at a relatively slow rate.

However, if the brake pads wear down close to the metal pad holders,

they should be replaced. Any more wear than this could cause damage to

the brake parts and improper operation of the brake system.

2nd gear sets

17T/39T

(Standard)

16T/40T

(Close)

18T/38T

(Wide)

Gear

1st

2nd

1st

2nd

1st

2nd

21.18

14.69

21.18

16.01

21.18

13.52

21.97

15.24

21.97

16.60

21.97

14.02

#of Spur Gear Teeth

With 24T Clutch Bell

2nd gear sets

17T/39T

(Standard)

16T/40T

(Close)

18T/38T

(Wide)

Gear

1st

2nd

1st

2nd

1st

2nd

25.42

17.63

25.42

19.21

25.42

16.22

26.36

18.28

26.36

19.92

26.36

16.82

#of Spur Gear Teeth

With 20T Clutch Bell

2nd gear sets

17T/39T

(Standard)

16T/40T

(Close)

18T/38T

(Wide)

Gear

1st

2nd

1st

2nd

1st

2nd

#of Spur Gear Teeth

With 22T Clutch Bell

(Standard)

22.75

15.78

22.75

17.20

22.75

14.52

27.30

18.94

27.30

20.63

27.30

17.42

24.82

17.21

24.82

18.76

24.82

15.84

*stock configuration out of the box

0.5mm

gap

23.96

16.62

23.96

18.11

23.96

15.29

23.11

16.03

23.11

17.47

23.11*

14.75*

40 •T-MAXX 3.3

Wheelie Bar Setup & Adjustment

Wheelie Bar Installation

The Maxx Wheelie Bar can be used on any Maxx truck with the

stock rear skid plate, rear bumper, and rear bumper mounts.

It is also compatible with the Traxxas accessory aluminum rear

bumper (Part #4935X). The wheelie bar is intended for use on hard,

high-traction surfaces, such as pavement, where controlling wheelies

can be difficult. It is easily removed for off-road racing or jumping.

1. Slowly bend the end of the skid plate downward, and then key the

skid plate into the slot of the wheelie bar.

2. Slide the wheelie bar down to the bottom of the skid plate,

and then snap the clip over the lower bumper tube.

3. Removal is opposite of installation. Snap the wheelie bar off of the

bumper, and then slide the wheelie bar off of the skid plate.

Wheelie Bar Setup Instructions

Changing the position of the wheelie

bar height setting is easier when the

wheelie bar is installed on the truck.

Snap the upper arms off of the

wheelie position cross bars. Move the

upper arms to the desired wheelie

position cross bar and then snap

them in place.

Each setting can offer different results based on the individual ride

height and droop settings for a particular truck. Try to avoid riding on

the wheelie bar wheels during normal driving (this can happen in the

lowest setting with lower than stock ride heights).

Remove the wheelie bar

when the T-Maxx will be

jumped or driven in harsh

off-road conditions.

Upper Arms

Position

Cross Bars

Tuning Adjustments

Position 1 (big wheelies)

Bottom position on

cross bars. Allows the

truck to tip back the

furthest during a

wheelie for longer,

high-speed wheelies.

Position 2

Position 4 (no wheelies)

The top position on

cross bars. Offers the

flattest launches with

little or no wheelie.

This is the factory

installed position to

reduce wheelies

during break-in.

Position 3

T-MAXX 3.3 •41

Your T-Maxx 3.3 requires timely maintenance in order to stay in top

running condition. Neglecting the maintenance could allow dirt,

deposits, and moisture to build up inside the engine leading to internal

engine failure. The following procedures should be taken very seriously.

After each hour of running:

Clean and re-oil the air filter. The instructions for this procedure are on

page 23. We cannot stress enough the value of cleaning your air

filter at the scheduled intervals. The cleanliness and condition of your

air filter directly influences the running life span of your engine. Do not

skip air filter maintenance!

Clean the outside of the engine of accumulated dirt, oil, and grime.

Accumulated grime will decrease the engine’s ability to cool itself.

Tighten the wheel nuts (especially on the left side). Use the 8mm end

of the included glow plug wrench.

After each running session:

Perform after-run maintenance on the engine. This clears the engine

of destructive moisture and other corrosive deposits. This is extremely

important for the life of the engine. See page 42 for after-run

maintenance procedures.

Inspect the gears for wear, broken teeth, or debris lodged

between the teeth

nspect the vehicle for obvious damage or wear. Look for:

1. Loose or missing screws

2. Cracked, bent, or damaged parts

3. Cut or loose wiring

4. Cut or kinked fuel lines

5. Signs of fuel leakage

Other periodic maintenance:

Connecting rod: The connecting rod should be replaced when the

piston and sleeve are replaced. Also replace the piston wrist pin and

G-clip whenever the connecting rod is replaced. As with other

internal engine components, connecting rod life depends engine’s

usage and the quality and frequency of the engine maintenance.

Inspect the connecting rod after 3-gallons of fuel have been used.

Slipper clutch pads (friction

material): Under normal use, the

friction material in the slipper

clutch should wear very slowly.

If the thickness of any one of the

slipper clutch pads is 1.8mm or less,

the friction disc should be replaced.

Measure the pad thickness using calipers or

measuring against the diameter of the 1.5 and

2.0mm hex wrenches provided with the model.

Piston/sleeve: The life of the piston and sleeve will

vary greatly with how the engine was used and

maintained. The piston and sleeve should be

replaced when they no longer seal effectively (loss

of compression). Symptoms include the engine

being difficult to start when warm, stalling when

warm, and stalling when throttle is suddenly closed

to idle. Replace the wrist pin and G-clip whenever

the piston and sleeve are replaced.

Maintaining and Storing Your T-Maxx 3.3

If the engine is worn or

damaged enough to require

replacing the piston, sleeve,

or connecting rod, consider

exchanging your old engine

for a brand new engine

under the terms of the

Traxxas Lifetime Engine

Replacement Plan (ERP). It

could save you time and

effort. Details are in your

model’s documentation

package.

The TRX 3.3 Racing Engine is

designed to be easy to

rebuild. Critical engine

components such as the

crankcase, crankshaft, and

engine bearings are made

to extremely high quality

standards and should under

normal circumstances

outlast multiple sets of

pistons, sleeves, connecting

rods, and wrist pins

(reciprocating assemblies).

It could be more economical

for you to continue to use

your good bearings and

crankshafts, and simply

replace the reciprocating

assembly as needed. Engine

assembly is not difficult and

replacing the reciprocating

assembly does not require

any special tools or skills.

42 •T-MAXX 3.3

After-run Procedure

You must perform after-run maintenance on your TRX 3.3 Racing Engine

whenever the model will be stored for longer than a few hours. Taking

the time to prepare your engine for storage will reward you with longer

engine life, easier starting, and better performance.

When a nitro engine is shut off, some excess unburned fuel remains in

the engine. The methanol in model engine fuel is hygroscopic, which

means it easily attracts and absorbs moisture. This moisture can cause

rust and corrosion on the steel engine parts (crankshaft, bearings, wrist

pin and starter shaft) if the fuel is not removed from the engine. There are

after run oil products available from your hobby dealer or you can use

WD-40™, a common household lubricant. To ensure your TRX 3.3 Racing

Engine is protected from internal corrosion, use the following procedure:

1. Shut off the engine by pinching the fuel line closed. This allows most

of the excess fuel to be consumed by the engine. Be sure the throttle

is in the idle position. You may have to pinch the fuel line closed for

several seconds before the engine stops.

2. Completely empty the fuel tank. Use your fuel-dispensing bottle to

suck out the old fuel. Do not mix the old fuel with your fresh fuel

supply. If you leave fuel in the tank, transporting or handling your

T-Maxx 3.3 may cause fuel to run into the engine.

3. With the fuel tank empty and the throttle at the idle position, try to

start the engine. The engine will most likely start and run for a few

seconds as it uses up any fuel remaining in the engine and fuel lines.

4. Once the engine stops, clean the outside of the engine with

compressed air or spray motor cleaner. Once the engine is clean and

dry, remove the glow plug power wire, glow plug, and air filter.

5. Open the throttle fully and spray a one-second burst of WD-40 into

the carburetor and into the glow plug hole (Caution! Wear safety

glasses to prevent spray from getting into your eyes). If you are using

after-run oil, follow the manufacturer’s instructions.

6. Place a rag or paper towel over the engine to catch any WD-40 or

after-run oil that may come out the carburetor or glow plug hole.

7. Connect the EZ-Start controller to the model and spin the engine for

10 seconds.

8. Remove the rag or paper towel and repeat steps 5–7 two more times.

9. Clean and re-oil the air filter so it will be ready for use next time. See

page 23 for air filter maintenance instructions.

10. Replace the glow plug, reconnect the glow plug power wire, and

reinstall the air filter.

Denatured alcohol

(available from home

centers and paint supply

stores) in a spray bottle is

an extremely effective

cleaner. Be sure to wear

safety glasses and gloves

when working with

denatured alcohol.

Be sure to follow proper

maintenance and storage

procedures to avoid

damage to your engine

and other components of

your T-Maxx 3.3.

Don’t put the fuel from

your tank back into your

fuel jug. Dispose of it

properly, following city or

county regulations.

Always wear eye

protection when using

compressed air or spray

cleaners and lubricants.

Maintaining and Storing Your T-Maxx 3.3

T-MAXX 3.3 •43

The following section addresses some very basic engine and radio

questions you may have about your T-Maxx 3.3. Most questions arise from

simple user errors or minor adjustments that are easy to correct. If you can’t

find a solution for your T-Maxx 3.3 here, then visit our Web site at

www.Traxxas.com/support. There you will find a much more extensive and

detailed online troubleshooting area. In addition, you may call Traxxas

Customer Service at 1-888-TRAXXAS (outside the U.S. call 972-265-8000).

Radio system does not work properly:

If the power light on the transmitter does not come on, check for proper

battery installation and that the batteries are new and/or fully charged. If

the power light is blinking, then the transmitter batteries are weak and

should be replaced. See page 11 for more details.

If the transmitter light is on but the radio is still not responding, check for

proper installation of the receiver batteries and that the batteries are

new and/or fully charged. Check to make sure the on/off switch on the

model is in the on position. Finally, if there is still no response check the

red and black wires that connect the battery pack to the “batt” terminal

on the receiver (you will have to remove the receiver cover). Make sure

the wires are not pinched or damaged and that the plug is secure in the

receiver. See page 12 for more details.

Short radio range:

If the radio range appears short, then first check to make sure the

transmitter antenna is fully extended and that the antenna in the T-Maxx

3.3 is in place and has not been cut or damaged. Next, make sure the

batteries are all fresh or fully charged. Finally, if you are still experiencing

short range, try a different location. Sometimes there can be interference

from various sources that can cause your radio to malfunction.

Engine will not spin (EZ-Start will not turn the engine):

If neither LED on the controller lights, the EZ-Start battery could be

discharged or improperly connected. Inspect and recharge if necessary.

If the glow plug LED lights and the motor LED does not, then the EZ-

Start controller is in protection mode. Allow the controller to cool for at

least three minutes. The circuitry should automatically reset.

Check to make sure the wires are connected to the EZ-Start motor in the

T-Maxx 3.3. The red wire should connect to the positive motor terminal,

indicated by a red dot next to the terminal.

The engine could be flooded. If too much fuel accumulates in the

combustion chamber at start up, the engine will hydraulically lock.

Follow the procedure on page 44 for clearing a flooded engine.

Check for binding at the engine flywheel. If you are not able to turn the

engine by hand, the engine could be flooded, there could be binding in

the clutch system, or there could be internal engine damage. (Note: It is

normal for the engine to be extremely tight and hard to turn when the

piston reaches the top of the compression stroke.)

Engine extremely sluggish, hard to start, and will not idle

during tank 1 of the break in:

It is possible that the factory adjusted break-in settings on your

carburetor are too rich for your geographic location, atmospheric

conditions, or fuel brand. Extremes in temperature, humidity, barometric

pressure, and altitude can’t always be accounted for with a single high-

speed needle setting. The symptoms described above can occur when

the air density is very low such as in high mountainous elevations, and

extremely cold temperatures. Under these conditions, lean the fuel

mixture slightly, 1/8 turn, to see if there is any improvement in starting

and idling. Only lean the fuel mixture just until the engine will run and

idle reliably and then proceed with the break in.

The contents of different brands of fuel (other than Traxxas Top Fuel) in

combination with extreme atmospheric conditions can also make the

factory preset break-in settings too rich and cause the symptoms

described above. Again, try leaning the fuel mixture slightly, 1/8 turn, to

see if there is any improvement in starting and idling.

Engine spins but will not start:

If the engine is spinning but will not start, first check to make sure that

both the motor and glow plug LEDs on the EZ-Start controller light when

the button is depressed. If the glow plug LED does not light, make sure

the blue glow plug wire is tightly connected and is not damaged in any

way. If the wire is good, then replace the glow plug. It is normal for glow

plugs to require periodic replacement. Only use Traxxas heavy-duty long

glow plugs (see your parts list).

Check to make sure the fuel is getting to the carburetor. Remove the fuel

line where it connects to the carburetor to see if there is fuel in it. If not,

you may need to prime the engine. Reconnect the fuel line and then

refer to page 28 for instructions on priming the engine.

Check your fuel mixture settings. It may be necessary to adjust the fuel

mixture if the outside temperature or barometric pressure has changed

significantly since the last time the engine was run (see Fine Tuning the

Carburetor on page 33). Turn the high-speed needle out

(rich/counterclockwise) 1/4 turn, hold the throttle trigger at about 1/2

throttle and try again to start the engine. Once started, retune the

engine for performance (see page 31).

Troubleshooting Your T-Maxx 3.3

44 •T-MAXX 3.3

The engine could be worn. If the fit between the piston and sleeve is

loose, compression is reduced and the engine will be difficult to start

when it is warm, and may tend to stall when running and when the

throttle is closed suddenly to idle. Engine life depends on many factors

including fuel type, air filter maintenance, needle settings, and how the

engine was used. For example, if the engine was allowed to ingest dirt

from lack of air filter maintenance or running through water, then the

internal engine components could wear out extremely fast.

Glow plug may have failed. If using an EZ-Start, check to see if the glow

plug light is on during starting. If not, replace the glow plug. If using a

glow ignitor, remove and check the glow plug.

Engine performance sluggish:

Engine performance depends mostly on the fuel mixture settings

and how they compensate for the current atmospheric conditions.

Before you suspect other failures with the engine, richen the high-speed

needle at least 1/4 turn and then retune the engine for performance (see

page 31).

If the fuel mixture seems to be set correctly, make sure the fuel is fresh. If

the fuel is old, or was left uncapped for a long period, then some of the

important fuel components could have evaporated. Try new, fresh,

Traxxas Top Fuel.

Try a new Traxxas glow plug. Sometimes a glow plug will work well

enough to start the engine but not be able to deliver the engine’s full

performance potential.

Check to make sure there is no binding in the driveline that would cause

excessive loads on the engine.

Clearing a Flooded Engine

If the engine is primed for too long during startup, then it can become

flooded with fuel. When the engine is flooded it will no longer turn due to

excess fuel in the combustion chamber preventing upward movement of

the piston. Use the following procedure to clear a flooded engine:

1. Remove the blue glow plug wire.

2. Remove the glow plug and gasket with the glow plug wrench supplied

with your model. A 5/16 or 8mm nut driver will also work.

3. Turn the model upside down and plug in the EZ-Start controller.

4. Push the EZ-Start button for several seconds to clear the engine

of excess fuel. Do not look into the glow plug hole while the

engine is spinning or you could spray fuel into your face!

5. Turn the model over and reinstall the glow plug and gasket.

6. Reconnect the blue glow plug wire to the glow plug.

7. Reconnect the EZ-Start controller.

8. Do not prime the engine. Pull the throttle to 1/2 throttle and push

the EZ-Start button. The engine should start immediately.

Piston stuck at “top dead center” (TDC)

“Top dead center” is the position where the piston is at the very top of the

tapered sleeve. Occasionally an engine can get “stuck” at this position. This

is most likely to happen on new engines during break-in, but can also

happen at other times. If the engine is stuck at TDC, use the following

procedure to release the piston from the sleeve:

1. Remove the glow plug using the included tool

or 8mm (5/16") nut driver and verify that the

piston is at the top of its stroke.

2. Use a flat blade screwdriver to rotate the

flywheel. Place the blade of the driver into one

of the grooves of the flywheel and push down,

turning the flywheel counter-clockwise when

viewed from the front. The flywheel should

turn, unsticking the piston from the sleeve.

3. Put two or three drops of light machine oil into

the glow plug hole to lubricate the piston and

sleeve. Do not use too much oil. It will hydro-

lock the engine. Verify the starter will spin the

engine with the glow plug out.

4. Rotate the flywheel so the piston is at bottom

dead center and replace the glow plug with

gasket. Reconnect the blue glow plug wire.

5. You should now be able to start

the engine with the EZ-Start.

Top Dead Center

Bottom Dead Center

Troubleshooting Your T-Maxx 3.3

Index

.20 20

ABC 20

Address 3

After-run procedure 43

Air density 33

Air filter 5, 6, 20, 23

cleaning 23

foam 20

housing 19

oil 5

Air/fuel mixture 24

Air/fuel ratio 24

Alignment settings 37

Altitude 29, 32

Antenna 13

crimp nut 13

mount 6

post 13

sleeve13

tip 13

transmitter 9, 13

tube 13

wrench 13

Atmospheric conditions 24

Axle Carrier 6

Barometric pressure 33

Baseline setting 33

Batteries 5

7.2V battery pack 5

alkaline 5

battery box 6

charger 5, 12, 26

NiCad 10

NiMH 10

receiver 12

RX power pack 5

BDC 20

Body Mount Post 6

Brake 6

brakepad 39

setup & adjustment 39

shoulder screw adjustment 39

Bulkhead 6

Bumper 6, 40

Bumper Mount 6, 40

Camber 37

Carburetor 19, 20, 24

air intake 19

fine-tuning 33

fuel intake 19

fuel mixture needles 24, 31, 32

slide 21

throttle arm 19

Channel 10

Chassis 6

Clean-out 20

Clutch bell 19, 38

Crystal (X-tal) 10

Customer support 3

Cylinder sealing 28

Decals 8

Differential 6

Driveshaft 6

Driving 34

tips 34

Dyno 20

e-mail 3

Engine (TRX 3.3) 6, 18

break-in 20, 28

tank 1 29

tank 2 29

tank 3 29

tank 4 29

tank 5 29

tank 6 29

winter break-in 30

clearing a flood 45

combustion chamber 20

connecting rod 20, 42

crankcase 19, 20

crankshaft19, 20

cylinder head 19, 20

cooling fins 20

fit 20

head protector 19

header 21

mount 19

piston 21, 42

port 21

shut-off clamp 6, 19, 27

shutting off 27

sleeve 21, 42

starting 28

terms 20

tuning 31

by temperature 33

EZ-Start™ 20, 26

battery 27

controller 19

drive unit 19

motor 6, 19

plug 6, 19

glowplug wire 19

ground wire19

negative wire 19

positivewire19

protection mode 27

using 27

Factory needle settings 25, 28

Flag color 10

Flame-out 20

Flywheel 19

Forward and reverse operation (shifting) 9, 34

Frequency 10

clearing 10

Fuel (see also nitromethane) 5, 20, 22

dispensing bottle 5

fuel line 6, 19, 20

handling 22

mixture20

other fuels 22

pressure line 6, 19

tank 6, 19

filling with fuel 23

fuel cap 6

tank seal adjustment 23

T-MAXX 3.3 •45

46 •T-MAXX 3.3

Gear Ratio 38

Glow plug 19, 20

driver 20

fouled 28

igniter 26

Hex Hub 6

High-speed needle 19, 21

adjustment 31

Humidity 32

Idle speed screw 19, 21

adjustment 25, 32

Jumping 34

Lean 21, 25

Low-speed needle 19, 21

adjustment 32

mAh 10

Maintenance 42

after each hour 42

after each session 42

after-run maintenance 43

periodic 42

Needle seat 24

Needle valve 21

Neutral position 10

Nitromethane (nitro) 21

content 21, 22

percentage 20, 22

O-ring 21

On/Off switch 6, 9

OptiDrive™ 6, 9, 15

Pinch test 32

Pivot Ball 6

Priming 21

Punch 21

Quick Start 7

Radio system (TQ-3) 9

adjustments 14

servo reversing 15

steering trim 14

throttle neutral 14

throttle trim 14

controls 14

range 9, 44

range testing 17

rules 16

terminology 10

using 17

Receiver 9, 10

box 6

Rich 21, 25

rpm 21

Safety 4

Servos 10

shifting 6, 9

steering 6, 9

throttle/brake 6, 9

Shift Rod 6

Shock (Damper) 6

fine tuning 35

mounting positions 35, 36

tower 6

Skid Plate 6, 40

Slipper clutch 6, 42

adjusting 37

Spur gear 6

changing 38

mesh 38

Stall 21

Storage 42

Suspension Arm 6

Suspension tuning 35

caster adjustment 35

pivot ball caps 35

TDC 21, 45

Tire gluing 8

Toe-in 37

Tools and equipment 5

Transmission 6

access plug 6

adjusting 38

tuning 37

Transmitter 9, 10

adjustment 14

battery compartment 9

controls 14

installing batteries 11

power indicator 9

power switch 9

servo reversing switch 9

steering wheel 9

throttle neutral adjust 9

throttle trigger 9

trim 10

steering trim 9

throttle trim 9

Troubleshooting 44

Tuned pipe 6, 19, 21

exhaust header 6

exhaust tip 19

pipe hanger 6

Turnbuckle (Toe Links) 6, 37

Two-speed (see also Transmission) 38

Two-speed ratio 39

Wear-in 21

Weather conditions 33

Wheelie Bar 6

installation 40

setup 40

Wiring diagram 9

WOT 21

Index

1100 Klein Road, Plano Texas 75074

1-888-TRAXXAS

MODEL 4909

owners manual

051216

T Maxx 3.3 Owners Manual Tmaxx33_own_man Tmaxx33 Own Man

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