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E-MAXX • 27

Your Traxxas transmitter has a programmable Multi-Function knob 
that can be set to control various advanced transmitter functions (set to 
Steering Sensitivity by default, see page 15). Accessing the programming 
menu is done by using the menu and set buttons on the transmitter and 
observing signals from the LED. An explanation of the menu structure 
follows on page 29. Experiment with the settings and features to see if 
they can improve your driving experience.  

Throttle Sensitivity (Throttle Exponential)

The Multi-Function knob can be set to control Throttle Sensitivity. 
Throttle Sensitivity works the same way as Steering Sensitivity as 
described on page 15, but applies the effect to the throttle channel. 
Only forward throttle is affected; brake/reverse travel remains linear 
regardless of the Throttle Sensitivity setting. 

Steering Percentage (Dual Rate)

The Multi-Function knob can be set to control the amount (percentage) 
of servo travel applied to steering. Turning the Multi-Function knob 
fully clockwise will deliver maximum steering throw; turning the knob 
counter-clockwise reduces steering throw (note: turning the dial 
counter-clockwise to its stop will eliminate all servo travel). Be aware 
that the steering End Point settings define the servo’s maximum 
steering throw. If you set Steering Percentage to 100% (by turning the 
Multi-Function knob fully clockwise), the servo will travel all the way to 
its selected end point, but not past it. Many racers set Dual Rate so they 
have only as much steering throw as they need for the track’s tightest 
turn, thus making the model easier to drive throughout the rest of the 
course. Reducing steering throw can also be useful in making a model 
easier to control on high-traction surfaces, and limiting steering output 
for oval racing where large amounts of steering travel are not required. 

Braking Percentage

The Multi-Function knob may also be set to control the amount of brake 
travel applied by the servo in a nitro-powered model. Electric models do 
not have a servo-operated brake, but the Braking Percentage function 
still operates the same way in electric models. Turning the Multi-Function 
knob full clockwise will deliver maximum brake throw; turning the knob 
counter-clockwise reduces brake throw (

Note

: Turning the dial counter-

clockwise to its stop will eliminate all brake action).

Throttle Trim

Setting the Multi-Function knob to serve as throttle trim will allow you 
to adjust the throttle’s neutral position to prevent unwanted brake drag 
or throttle application when the transmitter trigger is at neutral. 

Note

Your transmitter is equipped with a Throttle Trim Seek mode to prevent 
accidental runaways. See the sidebar for more information.

Steering and Throttle End Points

The TQi transmitter allows you to choose the limit of the servo’s travel 
range (or its “end point”) independently for left and right travel (on the 
steering channel) and throttle/brake travel (on the throttle channel). 
This allows you to fine-tune the servo settings to prevent binding 
caused by the servo moving steering or throttle linkages (in the case 
of a nitro model) farther than their mechanical limits. The end point 
adjustment settings you select will represent what you wish to be the 
servo’s maximum travel; the Steering Percentage or Braking Percentage 
functions will not override the End Point settings. 

Steering and Throttle Sub-Trim

The Sub-Trim function is used to precisely set the neutral point of the 
steering or throttle servo in the event that simply setting the trim knob 
to “zero” does not completely center the servo. When selected, Sub-Trim 
allows finer adjustment to the servo output shaft’s position for precise 
setting of the neutral point. Always set the Steering Trim knob to zero 
before making final adjustment (if required) using Sub-Trim. If Throttle 
Trim has been previously adjusted, the Throttle Trim will need to be 
reprogrammed to “zero” before making final adjustment using Sub-Trim.

Setting Lock

Once you’ve adjusted all of these settings the way you like them, you 
may want to disable the Multi-Function knob so none of your settings 
can be changed. This is especially handy if you operate multiple vehicles 
with a single transmitter via Traxxas Link Model Memory.

Multiple Settings and the Multi-Function Knob

It is important to note that settings made with the Multi-Function 
knob are “overlaid” on top of each other. For example, if you assign the 
Multi-Function to adjust Steering Percentage and set it for 50%, then 
reassign the knob to control Steering Sensitivity, the transmitter will 
“remember” the Steering Percentage setting. Adjustments you make 
to Steering Sensitivity will be applied to the 50% steering throw setting 
you selected previously. Likewise, setting the Multi-Function knob to 
“disabled” will prevent the knob from making further adjustments, but 
the last setting of the Multi-Function knob will still apply.

TRAXXAS LINK MODEL MEMORY

Traxxas Link Model Memory is an exclusive, patent-pending feature 
of the TQi transmitter. Each time the transmitter is bound to a new 
receiver, it saves that receiver in its memory along with all the settings 
assigned to that receiver. When the transmitter and any bound receiver 
are switched on, the transmitter automatically recalls the settings for 
that receiver. There is no need to manually select your vehicle from a list 
of model memory entries. 

TQ

i

 ADVANCED TUNING GUIDE

Starting Over:

  

Restoring Factory Defaults

When programming your 
2.4GHz transmitter, you may 
feel the need to start over with 
a clean slate. Follow these 
simple steps to restore the 
factory settings:
1. Turn transmitter off.
2. Hold both MENU and SET.
3. Turn transmitter on.
4. Release MENU and SET. The 

transmitter LED will blink red.

5. Press MENU once. The 

transmitter LED will blink red 
twice repeatedly.

6. Press SET to clear settings. 

The LED will turn solid 
green and the transmitter is 
restored to default.

Throttle Trim Seek Mode

When the Multi-Function knob is 
set to throttle trim, the transmitter 
remembers the throttle trim 
setting. If the throttle trim knob is 
moved from the original setting 
while the transmitter is off, or while 
the transmitter was used to control 
another model, the transmitter 
ignores the actual position of 
the trim knob. This prevents the 
model from accidentally running 
away. The LED on the face of the 
transmitter will rapidly blink green 
and the throttle trim knob (Multi-
Function knob) will not adjust the 
trim until it is moved back to its 
original position saved in memory. 
To restore throttle trim control, 
simply turn the multi-function 
knob either direction until the LED 
stops blinking. 

Summary of Contents for 39036 E-Maxx

Page 1: ...MODEL 3903 owners manual ...

Page 2: ... factory support possible Traxxas models are about experiencing total performance and satisfaction not just with your model but also with the company that stands behind it We know you re excited about getting your new model 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 and operating procedures that allow ...

Page 3: ...sted areas where its operation can conflict with or disrupt pedestrian or vehicular traffic Never under any circumstances operate the model in crowds of people Your model is very fast and could cause injury if allowed to collide with anyone Because your model is controlled by radio it is subject to radio interference from many sources that are beyond your control Since radio interference can cause...

Page 4: ...e Detection that alerts the driver when LiPo batteries have reached their minimum voltage discharge threshold It is the driver s responsibility to stop immediately to prevent the battery pack from being discharged below its safe minimum threshold Low Voltage Detection on the speed control is just one part of a comprehensive plan for safe LiPo battery use It is critical for you the user to follow a...

Page 5: ...liers Philips screwdriver Soldering iron For more information on batteries see Use the Right Batteries on page 11 Pre load spacers and shock pistons on parts tree seepage21 Foam blocks battery spacers seepage12 2 0mm T wrench 8mm 5mm wrench Antenna nut wrench 2 5mm L wrench Suspension multi tool Body clips Universal wrench 4 AA alkaline batteries Two 7 cell NiMH battery packs with Traxxas High Cur...

Page 6: ...Body Mount Hex Hub Suspension Arm Rear Axle Carrier Pivot Ball Toe Link Turnbuckle Receiver Box Front Bulkhead Front Differential Skid Plate Light Pipe Steering Servo Steering Servo Front Body Mount Battery Hold Down Battery Compartment Electronic Speed Control EVX 2 Battery Compartment Battery Hold Down Motors Titan Slipper Clutch Access Plug Rear Bumper Skid Plate Rear Bulkhead Spur Gear Pinion ...

Page 7: ... The transmitter requires 4 AA alkaline or rechargeable batteries Follow these critical steps to maintain the performance of your model and keep it in excellent running condition 4 Install battery packs in the model See page 12 Your model requires two fully charged battery packs included 5 Turn on the radio system See page 13 Make a habit of turning the transmitter on first and off last 6 Check se...

Page 8: ...OSFET power transistors to provide precise digital proportional throttle control Electronic speed controls use power more efficiently than mechanical speed controls so that the batteries run longer An electronic speed control also has circuitry that prevents loss of steering and throttle control as the batteries lose their charge 550 and 540 These numbers refer to the size of the motor 550 motors ...

Page 9: ...erminal and ground Using the analogy of the garden hose while current is the quantity of water flow in the hose voltage corresponds to the pressure that is forcing the water through the hose IMPORTANT radio system Precautions For maximum range always point the front of transmitter toward the model Do not kink the receiver s antenna wire Kinks in the antenna wire will reduce range DO NOT CUT any pa...

Page 10: ...t Connector Channel 2 EVX 2 Electronic Speed Control Channel 1 Steering Servos EVX 2 Wiring Diagram Your model is equipped with the newest TQi 2 4 GHz transmitter with Traxxas Link Model Memory The transmitter has two channels for controlling your throttle and steering The receiver inside the model has 5 output channels Your model is equipped with one servo and an electronic speed control Transmit...

Page 11: ...t the first sign of weak batteries flashing red light to avoid losing control TRAXXAS TQi RADIO SYSTEM 3 INSTALLING TRANSMITTER BATTERIES Your TQi transmitter uses 4 AA batteries The battery compartment is located in the base of the transmitter 1 Remove the battery compartment door by pressing the tab and sliding the door open 2 Install the batteries in the correct orientation as indicated in the ...

Page 12: ... Your model is equipped with the Traxxas High Current Connector Standard connectors restrict current flow and are not capable of delivering the power needed to maximize the output of the EVX 2 The Traxxas connector s gold plated terminals with a large contact surfaces ensure positive current flow with the least amount of resistance Secure long lasting and easy to grip the Traxxas connector is engi...

Page 13: ...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 reverse 70 30 Allows more throttle travel 70 and less reverse travel 30 Note We strongly recommend t...

Page 14: ... 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 Higher Speeds Require Greater Distance The faster you drive your model the more quickly it will near the limit of radio range At 60mph a model can cov...

Page 15: ...eering Sensitivity Negative Exponential By turning the Multi Function knob clockwise the steering sensitivity of the model will be decreased Note that a relatively large amount of steering wheel travel results in a smaller amount of servo travel The farther you turn the knob the more pronounced the effect becomes Decreased steering sensitivity may be helpful when driving on low traction surfaces w...

Page 16: ... neutral 4 Press and hold the EZ Set button A The LED will first turn green and then red Release the EZ Set button 5 When the LED blinks RED ONCE Pull the throttle trigger to the full throttle position and hold it there B 6 When the LED blinks RED TWICE Push the throttle trigger to the full reverse and hold it there C 7 When the LED blinks GREEN ONCE programming is complete The LED will then shine...

Page 17: ...mended discharge voltage threshold for LiPo battery packs the EVX 2 will limit the power output to 50 throttle When the battery voltage attempts to fall below the minimum threshold the EVX 2 will shut down all motor output The LED on the speed control will slowly blink red indicating a low voltage shutdown The EVX 2 will stay in this mode until a fully charged battery is connected Fast Blinking Gr...

Page 18: ... of the wide variation in the types of batteries that are available and the methods with which they can be charged it s impossible to give exact run times for the model Another major factor which affects run time is how the model is driven Run times may decrease when the model is driven repetitively from a stop to top speed and with repetitive hard acceleration Tips for Increasing Run Time Use bat...

Page 19: ...ll restrict the tires and put much higher loads on the motors Motor Precautions Titan motor life can be greatly reduced in mud and water If the motors get excessively wet or submerged use very light throttle run the motors slowly until the excess water can run out Applying full throttle to a motor full of water can cause rapid motor failure Your driving habits will determine motor life with wet mo...

Page 20: ...ent pending wire clamp feature gives you the ability to also install aftermarket radio systems and maintain the watertight features of the receiver box Removing the Receiver 1 To remove the cover remove the two 3x10mm button head cap screws 2 To remove the receiver from the box simply lift it out and set to the side The antenna wire is still inside the clamp area and cannot be removed yet 3 Remove...

Page 21: ...e pistons with a range of oil viscosities from 30W to 50W 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 damping Use only 100 pure silicone shock oil to prolong seal life From the factory the E Maxx uses 30W oil The ride height for the E Maxx can be adjusted by adding or removing the clip on s...

Page 22: ...air 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...

Page 23: ...ut 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 The E Maxx is equipped with an adjustable Torque Control slipper clutch which is built into the large spur gear The purpose of the slipper clutch is to regulate...

Page 24: ... gear chart Going Brushless Brushless motors provide increased power output and greater efficiency The E Maxx is designed with extra transmission and driveline strength to make it capable of handling extreme brushless power One or two brushless motors may be used A specially designed motor plate part 3997X and gear cover part 3977X are available for optimized single motor installations If you plan...

Page 25: ...is also parallel to the servo horns If not make small adjustments to the length of the link so the everything is parallel 8 The steering should operation correctly with equal travel left and right Now connect the second servo 9 Confirm the length of the center drag link 89 5mm see template below 10 Connect the center drag link to one of the steering servos Check for alignment with the holes in the...

Page 26: ...tors Use a product such as electric motor cleaning spray to flush dirt out of the motors After cleaning lubricate the bushings at each end of the motors with a drop of light weight electric motor oil Shocks Keep the oil level in the shocks full Use only 100 pure silicone shock oil to prolong the life of the seals If you are experiencing leakage around the top of the shock inspect the bladder in th...

Page 27: ...ent what you wish to be the servo s maximum travel the Steering Percentage or Braking Percentage functions will not override the End Point settings Steering and Throttle Sub Trim The Sub Trim function is used to precisely set the neutral point of the steering or throttle servo in the event that simply setting the trim knob to zero does not completely center the servo When selected Sub Trim allows ...

Page 28: ...en four times repeatedly 4 Press SET once The status LED will blink green once repeatedly 5 Press MENU once The status LED will blink green twice repeatedly 6 Press SET The memory is now selected to be deleted Press SET to delete the model Press and hold MENU to return to driving mode Failsafe Your Traxxas radio system is equipped with a built in failsafe function that returns the throttle to its ...

Page 29: ... to desired endpoint and press set to save To reset max throw Let go of controls and press SET The menu tree below shows how to navigate through the TQi transmitter s various settings and functions Press and hold MENU to enter the menu tree and use the following commands to navigate through the menu and select options MENU When you enter a menu you always start at the top Press MENU to move down t...

Page 30: ... LED blinks Press SET red LED blinks x3 Press MENU twice red LED blinks x3 Turn steering wheel to desired max left and right travel x8 Press SET to save each position Turn steering wheel to test settings IF END POINTS ARE OK Press hold MENU returns to driving mode IF END POINTS NEED TO BE CHANGED Press SET and repeat steps 6 8 To reset the END POINTS of STEERING servo to defaults Press hold MENU g...

Page 31: ...ing of your Traxxas model with stunning visuals and absolute precision Install Traxxas Link telemetry sensors on the model and Traxxas Link displays real time data such as speed RPM temperature and battery voltage Intuitive iPhone and iPod touch interface Traxxas Link makes it easy to learn understand and access powerful tuning options Control Drive Effects settings such as steering and throttle s...

Page 32: ...1100 Klein Road Plano Texas 75074 1 888 TRAXXAS 120529 KC1431 R04 owners manual MODEL 3903 ...

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