© 2013 ARRMA Durango Ltd. A subsidiary of Hobbico, Inc.
DESIGNED FAST. DESIGNED TOUGH.
22
Differential Tuning
Motor Removal
When turning a corner the inside wheel travels
a shorter distance than the outside wheel. A
differential allows the wheels to turn at different
speeds and take a corner more quickly.
Without a differential, on a high grip surface, the
inside wheel will lose traction and cause you to
spin-out. This effect is less noticeable on loose
surfaces, however a well setup differential will
make the car easier to drive and give more
predictable handling at speed.
The differential is filled with silicone oil and the
thickness of this alters the operation of the
differential unit. As standard, your differential
is designed to provide safe, fun handling -
for advice on which oil to use please visit the
forums at GOFORIT-RC.com
Removing the motor is useful for
cleaning the motor and also if choosing to upgrade to either a
different specification brushed motor or the awesome power of
an ARRMA GIGA brushless system!
To see what motor upgrades are available for your car please
visit ARRMA-RC.com or your local ARRMA distributor.
Oil Weight
Characteristic
Thinner (Lower CST)
Looser differential action
Less stable under braking (into corners)
Faster steering into corner
More steering in corner
Greater chance of oversteer
More chance of wheelspin
Less forward drive out of corner (in low grip conditions)
Generally better for low traction surfaces
Thicker (Higher CST)
Tighter differential action
More stable braking (into corner)
Slower steering into corner
Less steering in corner
Greater chance of understeer
Less chance of wheelspin
More forward drive out of corner
Generally better for high traction surfaces
Tools Required
2mm Hex Driver
7mm Nut Driver
or
Cross Wrench
1
3
2
4
Remove rear right wheel with 7mm nut driver/cross
wrench.
Remove motor bolts with 2mm hex driver. Loosen pinion
gear grub screw with 1.5mm hex driver and remove.
Remove motor andt clean if necessary.
Remove spur gear cover with 2mm hex driver and
disconnect motor wires.
Fit new electric motor (if required), fit pinion gear to
motor then set gear mesh (page 13). Replace spur gear
cover and rear wheel.
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