Bratex limited-slip differential for BMW E21/E30/E36/E53/E83/Z3 168

Bratex helical limited-slip differentials distribute torque between the wheels, concentrating more torque on the wheel with better traction, which improves performance and handling, especially in low-grip situations. The helical gearing manages friction distribution within the differential. When torque is applied to the helical gear system, a force is created that pushes the gear against the differential housing, generating friction. The higher the torque, the greater the thrust force, directly proportional to the amount of torque. This allows the Bratex differential to handle a considerable traction imbalance, even under high-power conditions, such as accelerating out of a high-speed corner. However, in low-torque conditions, the differential can differentiate quietly and smoothly, making it ideal for normal road driving. The Bratex differential uses the popular parallel-axis helical gear configuration, optimized for uniform load distribution. It is designed with a 5:1 torque ratio, which means that if one wheel loses traction, the wheel with more grip can receive five times more torque than the slipping wheel. However, five times zero is still zero, so all these helical limited-slip differentials work best when both wheels are on the ground and the slipping wheel still retains some traction. In practice, this is rarely a problem, as there is always some resistance on the slipping wheel; nevertheless, some drivers skillfully use left-foot braking to partially lock the spinning wheel. Affected vehicles:

BMW E21 315, 316, 318

BMW E21 320i

BMW E21 323i (without original limited-slip differential)

BMW E30 318i and 318is

BMW E36 316i, 318ti

BMW E36 318is, 320i

BMW E53 X5 4.4i (automatic front differential)

BMW E53 X5 4.6is (front differential)

BMW E83 X3 3.0d (front axle)

BMW E83 X3 3.0sd (front axle)

BMW Z3 1.9 (manual)

BMW Z3 2.0 (manual)

Technical data sheet

Supplier part number

YA0279