28 • DCB M41 WIDEBODY
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). Access
the programming menu 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 31. 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 rudder) 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 your model
at high speeds, or anytime a less aggressive steering feel
is desired.
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
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 tightest turn, thus
making the vehicle easier to drive throughout the rest of the course.
Reducing steering throw can also be useful in making a car or truck
easier to control on high-traction surfaces, and limiting steering output
for oval racing where large amounts of steering travel are not required.
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 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.
TQ
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ADVANCED TUNING GUIDE
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 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.
Turning Range
at Transmitter
Effective Turning
Range on Model
