Quaife ATB BMW Limited Slip Differential Conversions

The Quaife ATB Differential provides significantly improved traction and handling for powerful rear-wheel drive cars, and is a must-have upgrade for BMW owners looking to maximise the potential of their machines.

Once installed, drivers will notice an immediate difference as the Quaife's ATB design automatically biases torque across the axle to the wheel with most grip. Unwanted wheel-slip is greatly reduced, and the driver is able to put the power down in a controllable and seamless fashion.

 

Please note that LSD conversion of these differentials requires access to machinery.

In 2007 BMW began welding the crownwheel gear to the open differential instead of bolting them together in many of their models. This means that the crownwheel gear must be machined off and drilled so that the Quaife LSD can be bolted onto the crownwheel. 

We  provide technical drawings and installation guides.

 

How is the Quaife ATB Differential superior to other LSDs?

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 differentials (such as BMW's M-Power and M-Performance LSDs).

The Quaife ATB;

  • does not wear out
  • will not deteriorate in performance 
  • requires no maintenance or servicing
  • offers a progressive deployment of power by biasing torque, rather than locking
  • is capable of biasing 80% of torque to the wheel with more grip
  • comes with a lifetime warranty 

The Quaife ATB Differential also works seamlessly with the car's standard equipment and electronic control systems.

Why choose the QUAIFE LSD over other torque-biasing differentials?

RT Quaife Engineering LTD have been manufacturing and supplying their patented ATB design since the 1980s, and we have personally supplied more than 6000 units to BMW owners worldwide. 

The vast majority of other torque-biasing differentials are replicas or modified copies of the Quaife LSD. Some claim to have unfounded benefits, but we believe none match the proven performance and production quality of the Quaife. 

Will it invalidate my BMW warranty?

The Quaife ATB will not invalidate your BMW warranty.

BMW would not be able to attribute a fault elsewhere on the vehicle to an aftermarket LSD installation. They would not cover any defect with the differential itself of course, given it has been modified, but this is now covered by our own warranty and Quaife's lifetime guarantee.