ADJUSTING FRONT AND REAR GEAR DIFFERENTIALS
Originally Posted by T1bobo
Quick Q you guys what does putting diff oil in the front and rear diff do for the car?
also thanks for helping me with my setup problem i raced yesterday and did very well!!
Gear differential action is adjusted by filling the gear differential with differential oil of a specific viscosity.
Differential oil is rated with a viscosity number that indicates the thickness of the oil, which determines how much the oil resists flowing. Differential oil with a higher viscosity (for example, 100,000 oil) is thicker than differential oil with a lower viscosity (for example, 40,000 oil).
To make a gear differential LIGHTER, fill it with thinner oil.
To make a gear differential HEAVIER, fill it with thicker oil.
EFFECTS OF FRONT GEAR DIFFERENTIAL ADJUSTMENT
Lighter Front Differential (thinner oil)
Decreases stability under braking and acceleration
Increases chance of traction roll
Heavier Front Differential(thicker oil)
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
* 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.