Traxxas 56087-1 - Manual (Page 28)

28 • E-REVO BRUSHLESS
A total of four different rocker arm sets are available for E-Revo. All rocker
arms except the Long Travel rocker arms will allow the wheel to travel a
total of 90mm in the vertical direction. From the ride height position, the
wheel will be able to travel 60mm in the upward direction (bump), and
30mm in the downward direction (droop). The Long Travel rocker arm
increases total travel to 120mm. The progressive rate can be increased or
decreased by installing different rocker arm sets. The rockers are labeled
Progressive 1 to Progressive 3. Progressive 1 rockers will provide a low
progressive rate that maintains consistent damping force across through
the whole range of suspension travel. These are best for extremely rough
terrain that requires maximum suspension articulation. Progressive 3
rockers use high progressive rate that will improve high-speed cornering
on smooth surfaces by providing a firmer feel. Body roll, brake dive
and rear squat will also be reduced. Always change all four rockers as a
complete set. Do not mix rates and travel.
Using rockers with lower progressive rate may require the use of stiffer
springs to maintain proper spring pre-load and ride height. The spring
pre-load adjuster on each shock is designed for minor adjustments. If the
adjuster needs to be turned all the way down (compressing the spring) in
order to maintain proper ride height, then the next stiffer spring should
be used.
The chart below demonstrate the effect of the various rocker arms on
wheel force as the suspension is compressed. On the progressive rate,
wheel force is light at first and increases as the suspension is compressed.
Bump Steer Elimination Chart
The illustrations and the following table detail the position of the outer
toe link end for various caster and roll center settings to eliminate bump
steer. The shims and the hollow balls used to adjust bump steer are
provided with your vehicle.
Rear
When the rear upper control
arms are mounted in the
lower of its two mounting
holes in the bulkhead (roll
center), the tall hollow ball
should be used as shown.
Rocker Arm Total Travel Progressive Rate
Progressive 1
90mm
(60mm up / 30mm down)
Low
Progressive 2
90mm
(60mm up / 30mm down)
Medium
Progressive 3
90mm
(60mm up / 30mm down)
High
Long Travel
120mm
(80mm up / 40mm down)
Low
Outer Toe Link End Setup
Caster
5° 7.5° 10° 12.5° 15°
Control Arm
Mounting Hole on
Front Bulkhead
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Standard
Hollow Ball
Thin Shim
Thick Shim
Thin Shim
Standard
Hollow Ball
Thick Shim
Tall Center
Hollow Ball
Thick Shim
Standard
Hollow Ball
Thin Shim
Thick Shim
Thin Shim
Standard
Hollow Ball
FRONT
Control Arm
Mounting Hole on
Rear Bulkhead
Outer Toe Link
End Setup
Upper
Lower
Tall Center
Hollow Ball
(stock)
Tall Lower
Hollow Ball
Constant Rate Travel
Wheel Travel
Wheel Force
0
2
4
6
8
10
12
14
16
18
20
10 20 30 40 50 60 70 80 90
Progressive Rate Travel
When using Long Travel
rockers, a correspondingly
thicker shock oil (or pistons
with smaller diameter bypass
holes) should also be used to
ensure a proper relationship
between the spring and
damping forces.
ADVANCED TUNING ADJUSTMENTS