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TR A X X AS
TUNING ADJUSTMENTS
traction and tend to spin up to extremely high rpms. Higher viscosity
(thicker) oil causes the differential to act like a limited-slip differential,
distributing more equal power to the left and right wheels. Your model
will generally benefit from higher viscosity oil when climbing, rock
crawling, or racing on low traction surfaces.
Note:
Heavier oil will allow
power to be transferred even with one or more tires off the ground.
This can make the vehicle more likely to overturn.
From the factory, both the differentials are filled with SAE 30,000W
viscosity silicone oil. Only use silicone oil in the differentials. Traxxas
sells SAE 10,000W and SAE 50,000W viscosity oil (see your parts list).
The differentials have to be removed from the vehicle and
disassembled to change/replace oil.
MOTOR AND GEARING
Extensive testing has been done to determine the best gear ratios for
the Slash VXL 4WD and E-Revo VXL models. The stock gearing balances
power, speed, and efficiency to optimize the performance of the
models. However, you may wish to try different gear ratios in order to
customize the performance of your model. The gearing chart on this
page shows appropriate gearing for both models.
By installing a pinion with fewer teeth, or a spur gear with more teeth,
the transmission’s final drive ratio is increased. This means greater rpm
is required to achieve a given speed. Using a numerically higher gear
ratio will increase torque, but reduce top speed. Installing a pinion
with more teeth, or a spur gear with fewer teeth, will decrease the final
drive ratio, which will generally increase top speed but reduce torque.
However, installing too large a pinion will “overgear” the car, which will
reduce performance and may overheat the motor and speed control.
Use the following formula to calculate the overall ratio for combinations
not listed on the gear chart:
# Spur Gear Teeth
x 5.04 = Final Gear Ratio
# Pinion Gear Teeth
Gearing Compatibility Chart
The chart on the left shows a full
range of gear combinations. The
stock ratio for E-Revo VXL is shown in
blue. The stock ratio for Slash VXL is
shown in red.
The gear combinations in gray are
not suitable for either model when
using the included 6-cell battery,
speed control and motor. These gear
combinations have been included in
this chart as they may be used with
certain other aftermarket equipment
combinations.
Spur Gear
Pinion Gear
45
50
55
11
-
-
25.20
12
-
-
23.10
13
-
-
21.32
14
-
-
19.80
15
-
-
18.48
16
-
15.75
17.33
17
-
14.82
16.31
18
-
14.00
15.40
19
-
13.26
14.59
20
-
12.60
13.86
21
10.80
12.00
13.20
22
10.31
11.45
12.60
23
9.86
10.96
12.05
24
9.45
10.50
11.55
25
9.07
10.08
11.09
26
8.72
9.69
10.66
27
8.40
9.33
10.27
28
8.10
9.00
9.90
29
7.82
8.69
9.56
30
7.56
8.40
9.24
31
7.32
8.13
8.94
32
7.09
7.88
-
33
6.87
7.64
-
Stock 7107 E-Revo VXL
Stock 7007 Slash VXL 4WD
Acceptable range 7007 & 7107
Acceptable range 7007 only
50+mph 7107 E-Revo VXL
50+mph 7007 Slash VXL 4WD
Not suitable for stock models
If you have questions or need technical assistance, call Traxxas at
1-888-TRAXXAS
(1-888-872-9927) (U.S. residents only)