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SERVO SAVER PRELOAD
1.7.2
On cars equipped with an adjustable steering servo server, you may adjust the spring
preload to alter the steering characteristics.
EFFECTS OF SERVO SAVER PRELOAD
SERVO SAVER SPRING PRELOAD CHARACTERISTICS
Softer
• Less steering
• Better suited to standard servos
Stiffer
• More steering with a quicker reaction
• Better suited to high torque metal-geared servos
ADJUSTING SERVO SAVER PRELOAD
Adjust the preload of the central servo saver by adjusting the tension on the spring with
the threaded collar.
• To make the preload SOFTER, loosen the
collar so the spring is not compressed
as much.
• To make the preload STIFFER, tighten the
collar so the spring is compress more.
preload
BUMP STEER
1.7.3
Bump steer is a front suspension tuning option commonly used in off-road RC racing to
change steering characteristics over rough and loose terrain. Bump steer occurs when a
car’s front toe angle changes as the suspension compresses or rebounds, which affects
how parallel the front wheels are.
EFFECTS OF BUMP STEER
More bump steer
(wheels more parallel under
compression)
• Increases steering in mid-corner
• Steering may become “twitchy”
• Easier to control on smooth tracks
Less bump steer
(wheels open more under
compression)
• Decreases steering in mid-corner
• Smoother steering response
• Better on rough or bumpy tracks
ADJUSTING BUMP STEER
Bump steer is adjusted differently on every
car. Please refer to the car’s documentation
to determine how to make adjustments.
The following table describes how to adjust
bump steer on an XRAY XB808, using
shims below the steering plate (between
the steering rod inner ends and the bottom
of the steering plate).
More bump steer
• Fewer/thinner shims below steering plate
• Steering rod becomes more angled (away from horizontal)
Less bump steer
• More/thicker shims below steering plate*
• Steering rod becomes more horizontal
* Remember that you can add more shims to get less bump steer, but only up to a certain
point (when the steering rods become horizontal). If you continue to add more shims
the steering rod will become more angled the other way (as the inner end moves further
away from the steering plate), and you will start to get more bump steer again.
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
