Tuning Adjustments - Traxxas 69077-4 Owner's Manual

20 • TRAXXAS

TUNING ADJUSTMENTS

Once you become familiar with driving your model, you might need
to make adjustments for better driving performance.
Adjusting the Toe-in
Geometry and alignment specs play an important roll in your
model's handling. Take the time to set them correctly. Turn off TSM
(see page 25); then, set the steering trim on your transmitter to
neutral. Now, adjust your servo and tie rods so that both 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.
For increased stability, add one- to two-degrees of toe-in to each
front wheel. Use the turnbuckles to adjust the alignment.
Ride Height
Ride height can be adjusted by turning the spring pre-load adjusters
on the shock bodies. Turn the adjusters to the left to raise the
ride height. Turn them to the right to lower the ride height. When
adjusting spring pre-load be sure to change the adjustment equally
on the left and right sides so the suspension remains balanced.
Optimum ride height is 15mm clearance between the front of the
chassis and the ground and 18mm between the rear of the chassis
and the ground. Always set the ride height so the chassis has a
slight forward rake, with the rear ride height slightly higher than the
front ride height.
0°-2°
Factory Toe-In Settings
Front: 0-degrees
Rear: 0-degrees, non-adjustable
Adjusting the Anti-Roll Bar
Your model is equipped with
an anti-roll bar to adjust its
"roll-stiffness, " the tendency
for the chassis to lean in turns.
As shown in the illustration,
moving the link toward the
front of the car will decrease
the stiffness of the anti-roll bar, allow greater chassis lean and
more cornering traction. Moving the link toward the rear of the car
will increase the stiffness of the anti-roll bar and reduce cornering
traction. To adjust the link, loosen the set screw in the upper link's
pivot using the 1.5mm hex driver included with your model. Slide
the link to the desired position, then tighten the set screw. To
maintain balanced handling, always adjust the left and right sides of
the anti-roll bar equally.
Caution: Since the car is a drag-racing model and is engineered
primarily to run in a straight line, it will not corner as effectively as
a general-purpose car. Reduce corner speed to prevent rolling the
car over while turning.
Adjusting the Rear Suspension Linkages
The model's rear suspension
has been designed for
maximum drag racing
performance. On high-
traction surfaces, you may
wish to experiment with
reducing the tendency
0°-2°
for the rear end to "squat"
and transfer weight to
the rear axle. The rear
suspension's side links each have an additional adjustment hole on
the transmission that will decrease squatting under acceleration.
To further reduce squatting, the upper link may be moved to its
optional position on the transmission as well. Note: The side links'
chassis mounts have an open upper position, but using this position
requires the sway bar to be removed. Removing the swaybar is not
recommended.
Decrease Increase
Stiffness Stiffness
Upper Link
Optional Position
Lower Link
Optional Position
Not Used