Traxxas 7008 Owner's Manual page 23

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 for 50+mph
The included "High Speed" pinion gear will allow your model to
reach 50+mph when used with an additional Power Cell Series 1
battery (Part #2925) and (Part #3063) series connector (battery and
series connector sold separately).
50+mph Pinion Installation Instructions
1. Remove the motor as described on page 24.
2. Use the supplied 1.5mm wrench to loosen the pinion's set screw.
Remove the stock pinion.
TUNING ADJUSTMENTS
Spur Gear
Gearing Compatibility Chart
45 50 55
The chart on the left shows a full
11 - - 25.20
range of gear combinations. The
stock ratio for E-Revo VXL is shown in
12 - - 23.10
blue. The stock ratio for Slash VXL is
13 - - 21.32
shown in red.
14
- - 19.80
The gear combinations in gray are
15 - - 18.48
not suitable for either model when
using the included 6-cell battery,
16 - 15.75 17.33
speed control and motor. These gear
17
- 14.82 16.31
combinations have been included in
18 - 14.00 15.40
this chart as they may be used with
certain other aftermarket equipment
19 - 13.26 14.59
combinations.
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
Stock 7108 E-Revo VXL
28 8.10 9.00 9.90
Stock 7008 Slash VXL 4WD
29 7.82 8.69 9.56
Acceptable range 7008 & 7108
30
7.56 8.40 9.24
Acceptable range 7008 only
31 7.32 8.13 8.94
50+mph 7108 E-Revo VXL
32 7.09 7.88 -
50+mph 7008 Slash VXL 4WD
33
6.87 7.64 -
Not suitable for stock models
TR A X X AS • 23