Traxxas 4-Tec 2.0, Owner'S Manual

TRAXXAS • 29

Your Traxxas transmitter has a programmable Multi-Function knob 
that can be set to control various advanced transmitter functions (set to 
Traxxas Stability Management (TSM) by default, see page 17). 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 32. Experiment with the settings and 
features to see if they can improve your driving experience.  

Steering Sensitivity (Exponential)

The Multi-Function knob on the TQi transmitter can be set to control 
Steering Sensitivity (also known as exponential). The standard setting 
for Steering Sensitivity is “normal (zero exponential),” with the dial full 
left in its range of travel. This setting provides linear servo response: the 
steering servo’s movement will correspond exactly with the input from 
the transmitter’s steering wheel. Turning the knob clockwise from center 
will result in “negative exponential” and decrease steering sensitivity by 
making the servo less responsive near neutral, with increasing sensitivity as 
the servo nears the limits of its travel range. The farther you turn the knob, 
the more pronounced the change in steering servo movement will be. 
The term “exponential” comes from this effect; the servo’s travel changes 
exponentially relative to the input from the steering wheel. The exponential 
effect is indicated as a percentage—the greater the percentage, the greater 
the effect. The illustrations below show how this works. 

Normal Steering Sensitivity (0% 
exponential):

In this illustration, the steering 
servo’s travel (and with it, the 
steering motion of the model’s 
front wheels) corresponds 
precisely with the steering wheel. 
The ranges are exaggerated for 
illustrative purposes.

Decreased Steering 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, when driving at high speed, or on tracks 
that favor sweeping turns where gentle steering inputs are required. The ranges are 
exaggerated for illustrative purposes.

Throttle Sensitivity (Throttle Exponential)

The Multi-Function knob can be set to control Throttle Sensitivity. 
Throttle Sensitivity works the same way as Steering Sensitivity, 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 counterclockwise reduces steering throw (note: turning the dial 
counterclockwise 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 counterclockwise reduces brake throw (

Note

: Turning the dial 

counterclockwise 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.

TQ

i

 ADVANCED TUNING GUIDE

Turning Range  

at Transmitter

Effective Turning 

Range on Model

Starting Over:

Restoring Factory Defaults

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

The transmitter LED will 
blink red.

5. 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.