 During normal steady state driving, the Acceleration Device input shaft (from the engine) and output shaft (to the rear differential) spin at almost equal speeds.In a cornering situation, the output shaft spins up to 5.7% faster than the input shaft, effectively speeding up the rear wheels.The electromagnetic clutch packs, based on sensor inputs, will vary the torque sent to the rear differential from side to side providing constant and dynamic balancing of the car handling characteristics.