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Old 11-09-2008, 03:51 PM   #1
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Questions?? Need help with differential Setups

Hello all...

Was hoping someone could tell me the theory behind the the different weight oil in the front and rear differentials of a 1/10 sedan.

I have a GS Vision Pro kit which I'm rebuilding and although the manual suggest 7000 wt in the front, and 4000 wt in the rear. What does this do?

I was wondering how various weights front and back would affect the car? Also what does same oil weight in front and back do? Does it give car a truer 4wd?

Any insight would be greatly appreciated.

Car
GS Vision Pro
Radio
JRRacing XR3
Engine
Siro Outlaw .12

Last edited by Kyo83; 11-09-2008 at 11:22 PM.
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Old 11-10-2008, 06:28 AM   #2
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the heavy the weight oil makes both wheels pull more at the same rate.

lighter oil allows the wheels to move at different rates

heavy oil upfront makes car handle like it has a spool in it i.e.100,000w

usaully 10 0r 20,000 in rear and 30,000 or higher in front depending on your driving style and preference

thicker oil also makes the car more stable under braking
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Old 11-11-2008, 12:06 AM   #3
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Thanks Chief!
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Old 11-11-2008, 12:28 AM   #4
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hope this helps

EFFECTS OF FRONT GEAR DIFFERENTIAL ADJUSTMENT
Lighter Front Differential (thinner oil)
• Decreases understeer
• Decreases stability under braking and acceleration
• Increases chance of traction roll
Heavier Front Differential(thicker oil)
• Increases understeer
• Increases stability under braking and acceleration
• Reduces chance of traction roll

EFFECTS OF REAR GEAR DIFFERENTIAL ADJUSTMENT

Lighter Rear Differential (thinner oil)
• Decreases on-throttle steering
• Less acceleration if the grip is there
• Less predictable car (cars with very “loose” diffs have a tendency to understeer heavily under throttle and turn-in oversteer as soon as you lift)
• Less on-throttle oversteer (snap-oversteer)
• Less turn-in understeer
• Less stable under braking
Heavier Rear Differential (thicker oil)
• Increases on-throttle steering
• Better acceleration if the grip is there
• More predictable car (cars with very “loose” diffs have a tendency to understeer heavily under throttle and turn-in oversteer as soon as you lift)
• More on-throttle oversteer (snap-oversteer)
• More turn-in understeer
• More stable under braking

TRACTION CONSIDERATIONS:
* The higher the traction, the lighter the diff oil up front, and the heavier at the rear.
* The lesser the traction, the heavier the diff oil up front, and the lighter at the rear.

all the best grub
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