Blackline limited slip differential - Ford Focus Mk2 ST225 - Volvo C30 - 6-speed manual transmission M66

The Blackline limited slip differential for the Ford Focus Mk2 ST225 and Volvo C30 with the M66 6-speed transmission, also known as an LSD (Limited Slip Differential), improves traction by distributing torque between the two-wheel drive systems 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 press 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 when exiting 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-shaft 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. It is therefore most effective when both wheels maintain a minimum level of traction. This technology also works particularly well in conjunction with modern ABS systems.

The Blackline HLF171 limited slip differential is designed for the Ford Focus Mk2 ST225 and Volvo C30 equipped with the M66 6-speed transmission. It installs as a direct replacement for the original differential on compatible vehicles. Its housing and gears are made of high-resistance 8620 steel.

Technical Specifications of the Blackline Limited Slip Differential for the Ford Focus Mk2 ST225 and Volvo C30 with M66 Transmission

Manufacturer Part Number: HLF171
Quaife application code: QDF13J
Type: Helical-gear limited slip differential
Ford compatibility: Ford Focus Mk2 ST225
Volvo compatibility: Volvo C30
Transmission type: M66 6-speed gearbox ratio
Torque split ratio: 5:1
Housing and gear material: High-resistance 8620 steel
Mounting: Direct replacement for the original differential

Key features of the Blackline limited slip differential for the Ford Focus ST225 and Volvo C30 with M66 transmission

• 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.