BMW M140I/M240I Quaife Differential (B58)

The Quaife ATB Differential provides significantly improved traction and handling for powerful rear-wheel drive cars, and is an absolute must-have performance upgrade for owners of these brilliant driving machines.

Only the M-Powers arrive from the factory properly equipped with a mechanical limited-slip differential. Unfortunately, those of us who choose a slightly more practical and less aggressive BMW may well find that the standard power of the car easily overcomes the amount of traction available. This is especially true with recent models, equipped with turbocharged engines that produce a lot of torque, and often equipped with run-flat tyres and stiff suspension set-ups. Lack of traction will of course worsen when road conditions become more slippery or bumpy too.

A plug & play solution is available to customers worldwide – Complete Quaife ATB-equipped Differentials in exchange or outright (subject to stock) are available, including optional high performance bearings.

Why choose Quaife?

British manufacturer RT Quaife Engineering LTD is a global leader in the automotive drivetrain industry, supplying motorsport users, volume OEM and commercial customers with a wide variety of performance products since 1965. Their innovative Quaife ATB Differential, their flagship product, was chosen by FORD to use as standard equipment in a number of their performance models – a testament to their reputation for quality and reliability.

Once installed, drivers will notice an immediate difference as the Quaife’s patented ATB design automatically biases torque across the axle to the wheel with most grip. Unwanted wheel-slip is greatly reduced, enabling drivers to exploit the full potential of their machines, leading to a more exciting, rewarding and rapid driving experience.

Widely regarded as the differential upgrade of choice for road car owners, the Quaife ATB was designed to overcome the flaws of conventional clutch-plate limited-slip diffs such as BMW’s M-Performance LSD, Drexler, and OS Giken.

Features

The Quaife ATB;

• does not wear or require maintenance
• will not deteriorate in performance
• comes with a limited lifetime warranty
• offers a progressive deployment of power rather than locking, providing more user-friendly characteristics and control during moments of oversteer
• is capable of biasing 80% of torque to the wheel with most grip, instead of a fixed locking percentage
• works perfectly with all standard components and electronics, and will not invalidate the manufacturer’s warranty.