TRA82056-4RED Traxxas TRX-4 Manual

TRX-4
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27
MOTORS AND GEARING
The TRX-4’s Titan
™
550 Motor has been carefully matched to the
needs of the TRX-4. The Titan 550 is made to run efficiently at high
voltage to provide more torque and longer run times. We do not
recommend converting the TRX-4 to a typical low-voltage setup
using traditional 540 size motors. While these components will
physically fit into the TRX-4, 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.
The TRX-4 is equipped from the factory with a 45-tooth spur gear
and 11-tooth pinion gear. TRX-4 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. With the Titan 550
motor, do not use a pinion gear larger than 12-tooth with the
stock 45-tooth spur gear. Use the following formulas to calculate
the overall ratio for combinations not listed on the gear chart:
TUNING ADJUSTMENTS
To find High Gear :
# Spur Gear Teeth
x 6.32 =
Final
Gear Ratio
# Pinion Gear Teeth
To find Low Gear :
# Spur Gear Teeth
x 15.8 =
Final
Gear Ratio
# Pinion Gear Teeth
Gearing Compatibility Chart:
The charts below show 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.
Stock factory gearing
Does not fit
Not recommended for stock motor
Spur Gear
Pinion Gear
39 45
9
68.47 79.00
10
61.62 71.10
11
56.02 64.64
12
51.35 59.25
13
47.40 54.69
14
44.01 50.79
15
41.08 47.40
16
38.51 44.44
17
36.25 41.82
18
34.23 39.50
19
32.43 37.42
20
30.81 35.55
21
29.34 33.86
22
28.01 32.32
High Gear Low Gear
Spur Gear
Pinion Gear
39 45
9
27.39 31.60
10
24.65 28.44
11
22.41 25.85
12
20.54 23.70
13
18.96 21.88
14
17.61 20.31
15
16.43 18.96
16
15.41 17.78
17
14.50 16.73
18
13.69 15.80
19
12.97 14.97
20
12.32 14.22
21
11.74 13.54
22
11.20 12.93
For 6- or 7-cell NiMH battery and 2s/3 LiPo battery