Motors And Gearing; Caster Adjustment; Shock Mounting Positions - Traxxas E-Maxx 3906 Owner's Manual

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

Motors and Gearing

The Titan ™ 550 Motors on your E-Maxx have been carefully
designed to match the needs of the E-Maxx. The Titans are made
to run efficiently at high voltage to provide more torque and
longer run times. We do not recommend converting the
E-Maxx to a typical low voltage setup using traditional 540
size motors. While these components will physically fit into the
E-Maxx, the system will not run as efficiently, losing power in the
form of motor and battery heating. The result will be shorter run
times, high current draw, and extreme battery and motor
temperatures. If you are considering replacement motors, look
for 550 motors capable of 12 or more volts.
The E-Maxx is equipped from the factory with a 66-tooth spur
gear and 18-tooth pinion gears. E-Maxx has a large range of
gearing making it suitable for many different types of
applications and environments. If you want more acceleration
and less top speed, use a smaller pinion gear (fewer teeth, higher
numerical ratio). For more top speed, use a larger pinion gear
(lower numerical ratio). The overall reduction is the number of
turns the motor makes for one revolution of the tire. Higher
numerical ratios provide more torque, lower numerical ratios
provide more top speed. With the Titan motors, do not use a
pinion gear larger than 20-tooth with the stock 66-tooth spur
gear or, do not go lower numerically than 16.1 to 1 gear ratio
in high gear.

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.
Caster adjustment shims (2 Front) Caster adjustment shims (1 Front, 1 Rear)
Vertical
Vertical
4° 7°
Ground plane
Ground plane

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.
Adjusting Your E-Maxx
12 1st
2nd
13 1st
2nd
Caster adjustment shims (2 Rear)
14 1st
2nd
15 1st
2nd
16
1st
2nd
Vertical
10°
Ground plane
17
1st
2nd
18
1st
2nd
19
1st
2nd
20
1st
2nd
21
1st
2nd
22
1st
2nd
Spur Gear
64 66 70 72
43.36 45.99 47.30
26.92 28.56 29.37
40.03 42.45 43.66
24.85 26.36 27.11
36.04 37.17 39.42 40.55
22.38 23.08 24.48 25.18
33.64 34.69 36.79 37.84
20.89 21.54 22.85 23.50
32.52 34.49 35.48
31.54
19.58 20.19 21.42 22.03
29.68 30.61 32.46 33.39
18.43 19.01 20.16 20.73
28.03 28.91 30.66
17.41 17.95 19.04
26.56 27.39 29.05
16.49 17.01 18.04
25.23 26.02
15.67 16.15
24.03 24.78
Do not
14.92 15.39
use with
Titan
22.93 23.65
motors.
14.24 14.69
Overall Reduction
23