E-MAXX BRUSHLESS • 23
TUNING ADJUSTMENTS
MOTOR AND GEARING
The E-Maxx is equipped from the factory with a 68-tooth spur gear
and 17-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). 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. Use the following
formula to calculate the overall ratio for combinations not listed on
the gear chart:
Caution!
Operating your model with 65+mph gearing
• The 28/65 ratio for use with 6S LiPo batteries is designed
for maximum speed on smooth surfaces only, with steady
acceleration to full throttle and optional Talon tires installed.
• Do not use this gear ratio for general driving.
• Avoid repetitive starting and stopping.
• Do not use the 28/65 ratio with NiMH batteries or low-capacity
LiPo batteries. 5000mAh LiPo batteries are recommended.
• Allow the motor to cool between runs, and monitor motor
temperature.
• Do not use the 28/65 gear ratio for off-road running or
overheating and damage may result.
• Do not allow the motor temperature to exceed 200° F or damage
and motor failure may result.
To accurately monitor motor temperature, Traxxas suggests the
#4091 On-Board Temperature Gauge. The gauge features a large
LCD screen, on/off button for longer battery life, a min/max temp
button, a Centigrade/Fahrenheit button, and a clear Lexan splash
guard. Visit your local dealer or Traxxas.com for more information.
Adjusting Gear Mesh
Incorrect gear mesh is the most
common cause of stripped spur
gears. Gear mesh should be
checked and adjusted anytime
a gear is replaced. Access the
gears by removing the single
screw on the top gear cover.
To set the gear mesh, cut a
narrow strip of notebook paper
and run it into the gear mesh.
Loosen the motor screws and
slide a motor and pinion gear
into the spur gear. Retighten the
motor screws and then remove
the strip of paper. Repeat with
the other motor. You should
be able to run a fresh strip of
paper through the gears without
binding them.
# Spur Gear Teeth
x 5.22 = Final Gear Ratio
# Pinion Gear Teeth
Motor
Screw
Strip of
Paper
Your Battery Selection and Pinion Gear
Selection Determines Your Speed.
How Fast Do You Want To Go?
Battery
Nominal Voltage
mAh
Skill Level
Battery
Pinion/Spur
Nominal Voltage
mAh
Skill Level
* With Included Optional Gearing
** 24T pinion not included. Optional gearing for high-speed running on smooth surfaces only.
25+mph
25+mph
35+mph
35+mph
**
#5608 E-Revo
Brushless Edition
18/65
18/65
18/65
18/65
**
**
16.8V
twin 6-Cell NiMH
(12 cell total)
twin 7-Cell NiMH
(14 cell total)
14.4V
3000+ mAh
4000+ mAh
14.8V
5000+ mAh
twin 3S LiPo
(6S total)
twin 2S LiPo
(4S total)
22.2V
5000+ mAh
twin 3S LiPo
(6S total)
22.2V
5000+ mAh
Your Battery Selection and Pinion Gear
Selection Determines Your Speed.
How Fast Do You Want To Go?
Battery
Nominal Voltage
mAh
Skill Level
Battery
Pinion/Spur
Nominal Voltage
mAh
Skill Level
* With Included Optional Gearing
** 28T pinion and 65T spur not included. Optional gearing for high-speed running on smooth surfaces with optional Talon tires only.
25+mph
28+mph
35+mph
35+mph
**
#3908 E-Maxx
Brushless Edition
18/65
17/68
18/65
17/68
**
**
16.8V
twin 6-Cell NiMH
(12 cell total)
twin 7-Cell NiMH
(14 cell total)
14.4V
3000+ mAh
3000+ mAh
14.8V
5000+ mAh
twin 3S LiPo
(6S total)
twin 2S LiPo
(4S total)
22.2V
5000+ mAh
twin 3S LiPo
(6S total)
22.2V
5000+ mAh
40+mph
50+mph
65mph
& Beyond
18/54
18/65
24/54
40+mph
50+mph
65mph
& Beyond
20/68
17/68
28/65
Your Battery Selection and Pinion Gear
Selection Determines Your Speed.
How Fast Do You Want To Go?
Battery
Nominal Voltage
mAh
Skill Level
Battery
Pinion/Spur
Nominal Voltage
mAh
Skill Level
25+mph
28+mph
35+mph
35+mph
**
#3908 E-Maxx
Brushless Edition
18/65
17/68
18/65
17/68
**
**
16.8V
twin 6-Cell NiMH
(12 cell total)
twin 7-Cell NiMH
(14 cell total)
14.4V
3000+ mAh
3000+ mAh
14.8V
5000+ mAh
twin 3S LiPo
(6S total)
twin 2S LiPo
(4S total)
22.2V
5000+ mAh
twin 3S LiPo
(6S total)
22.2V
5000+ mAh
40+mph
50+mph
65mph
& Beyond
20/68
17/68
28/65
Gearing Compatibility Chart:
The chart below shows a full range
of gear combinations. This does NOT
imply that these gear combinations
should be used. Over-gearing
(bigger pinions, smaller spurs) can
overheat and damage the motor
and/or speed control.
65
68
15
DNF
4.53
16
DNF
4.25
17
DNF
4.00
18
DNF
3.78
19
3.42
3.58
20
3.25
3.40
21
3.10
3.24
22
NR
3.09
23
NR
DNF
24
NR
DNF
Pinion Gear
Spur Gear
Stock gearing
Optional included gearing (4S LiPo)
Recommended gearing
for all battery types
Recommended gearing
for 4S LiPo only
Not recommended
Does not fit
B
B
