Traxxas 39087-1 - Manual (Page 20)

20 • E-MAXX BRUSHLESS
TUNING ADJUSTMENTS
SUSPENSION TUNING
Adjusting the Pivot Ball Caps
The pivot ball caps should be adjusted
so that the pivot balls operate freely in
the axle carriers with no excess play.
Use the provided four-way suspension
multi-tool to tighten or loosen the
pivot ball cap.
Caster Adjustment
The E-Maxx offers the ability to adjust the caster angle of the front
suspension. Caster adjustment may be used to influence the understeer/
oversteer handling characteristics of the E-Maxx. Increasing the caster
angle will increase the tendency of the truck to oversteer (less traction
on the rear tires, more traction on the front tires), while decreasing the
caster angle will cause the truck to have a tendency to understeer (push
in the turns). This effect becomes more pronounced at higher steering
angles and higher spring rates. Caster is adjusted by repositioning the
shims on the pivot point of the upper suspension arms.
The stock caster setting is 7-degrees with one shim at each end of the
arm. Reduce the caster angle to 4-degrees by removing the rear shim
and inserting it next to the front shim. The caster angle can be increased
to 10-degrees by removing the front shim and inserting it next to the
rear shim.
Fine Tuning the Shocks
The eight shocks (oil dampers) on your E-Maxx have tremendous
influence on its handling. Whenever you rebuild your shocks, or make
any changes to the pistons, springs or oil, always do it carefully and in
sets (front or rear). Piston head selection depends on the range of oil
viscosities that you have available. For example, using a two-hole piston
with lightweight oil will give you the same damping as a three-hole
piston with heavier oil.
We recommend using two-hole pistons with
a range of oil viscosities from 30W to 50W
(available from your hobby shop). The thinner
viscosity oils (30W or less) flow with less
resistance and provide less damping, while
thicker oils provide more damping. Use only
100% pure silicone shock oil to prolong seal life.
From the factory, the E-Maxx uses 30W oil.
The ride height for the E-Maxx can be adjusted
by adding or removing the clip-on spring pre-
load spacers. Note that changes in ride height
will occur when changes in shock angle or spring
rates are made. You can compensate for ride
height changes by changing the pre-load spacers
on the shocks
Shock Mounting Positions
Big bumps and rough terrain require a softer suspension with the
maximum possible suspension travel and ride height. Racing on a
prepared track or on-road use requires a lower ride height and firmer,
more progressive suspension settings. The more progressive suspension
settings help reduce body roll (increased roll stiffness), dive during
braking, and squat during acceleration.
Upper shock mounting position
(A) should generally be used
with lower shock mounting
positions 1 and 2. Upper shock
mounting position (B) should
be generally be used with lower
shock mounting positions 3 and
4. The innermost upper shock
mounting position (0) can be
used for tuning with the inner
pair of lower shock mounting
positions on the arm (1,2). It
is not compatible with lower
shock mounting positions 3 and
4. Other combinations may be
used to achieve individualized
suspension settings.
Caster adjustment shims (1 Front, 1 Rear) Caster adjustment shims (2 Front) Caster adjustment shims (2 Rear)
Vertical
4
Ground plane
7
Vertical
Ground plane
Vertical
Ground plane
10
For easier access to the
rear-most shock mounting
screw, remove the one end
of the rear turnbuckle. In the
front, remove the suspension
pin from the lower front
suspension arm to gain easier
access to the lower shock
mounting screws.