The Blackline limited slip differential for BMW E46, E81, E82, E87, and E90 models with 168L rear axle, also known as an LSD (Limited Slip Differential), improves traction by distributing torque between the two-wheel drive drive wheels based on available grip.
Its helical gear design allows the limited slip differential to transmit more torque to the wheel with the best traction. As torque increases, the gears exert pressure against the differential housing and generate the internal friction necessary for this torque distribution. The system can thus handle a significant difference in drive force between the two wheels, particularly during heavy acceleration out of a turn or when traction is limited.
Under light loads, the helical limited slip differential maintains smooth, progressive, and quiet operation. The wheels can continue to rotate at different speeds when necessary, particularly when cornering. This feature improves traction during spirited driving while maintaining handling suitable for on-road use.
The Blackline limited slip differential uses a parallel-axis helical gear architecture optimized to distribute forces. Its 5:1 torque split means that when one of the wheels loses traction, the wheel with the most traction can receive up to five times the torque transmitted to the spinning wheel.
As with any helical-gear limited slip differential, a minimum amount of resistance must remain on the wheel with the least traction to allow torque transfer. Its effectiveness is therefore optimal when both wheels remain in contact with the ground. This technology also works particularly well in combination with modern ABS systems.
The Blackline HLF020 limited slip differential is designed for various BMW 1 Series and 3 Series models equipped with a 168L rear axle, with specific configurations for mechanical or automatic gearboxes. It installs as a direct replacement for the original differential. Its housing and gears are made of high-strength 8620 steel.
Technical Specifications of the Blackline Limited Slip Differential for BMW E46, E81, E82, E87, and E90 with 168L Rear Axle
Manufacturer Part Number: HLF020
Quaife application equivalent: QDF16N
Type: Helical-gear limited slip differential
Compatibility with BMW E46:
- BMW E46 316i
- BMW E46 316ti
- BMW E46 318Ci - mechanical transmission
- BMW E46 318i - mechanical transmission
- BMW E46 318ti - mechanical transmission
- BMW E46 320i - automatic gearbox
- BMW E46 320i - mechanical transmission with 168K oil pan
BMW E81 compatibility:
- BMW E81 118i - mechanical transmission
BMW E82 compatibility:
- BMW E82 120i - automatic gearbox
Compatibility with BMW E87:
- BMW E87 116i - mechanical transmission
- BMW E87 118d - mechanical transmission with 168L rear axle
- BMW E87 120d - mechanical transmission with 168L rear axle
- BMW E87 120i - automatic gearbox with 168L rear axle
- BMW E87 120i - mechanical transmission with 168L rear axle
BMW E90 Compatibility:
- BMW E90 320i - automatic gearbox with 168L oil pan
- BMW E90 320i - mechanical transmission with 168L transmission case
- BMW E90 320si - mechanical transmission with 168L transmission case
Differential type: 168L, with specific 168K application for BMW E46 320i with mechanical transmission
Torque split ratio: 5:1
Housing and gear material: High-resistance 8620 steel
Mounting: Direct replacement for the original differential
After the mid-1990s, BMW decided to no longer equip its models—with the exception of M cars—with a limited slip differential (LSD). Instead, the brand opted to limit power output via the traction control system, which reduces performance potential.
Combined with BMW’s exceptional chassis and remarkable dynamic qualities, this differential efficiently transfers power to the road and makes the car faster, especially in low-traction conditions.
Key Features of the Blackline Limited Slip Differential for BMW with 168L Rear Axle
- Torque split between the wheels based on available traction.
- Delivers more torque to the wheel with the best traction.
- Immediate and progressive reaction to changes in traction.
- Smooth, progressive, and quiet operation.
- No friction discs for reduced maintenance requirements.
- Power delivery that is easily controllable, especially during spirited driving and drifting.
- Housing and gears made of high-resistance 8620 steel.
- Direct mounting for the original differential.
Products intended for vehicle modification for competition purposes may render their use prohibited on public roads, insofar as they significantly alter the vehicle's characteristics as specified in the type-approval certificate issued by the relevant authorities (noise level, pollutant emissions, maximum speed, tire dimensions, etc.).
