![]() Of course if you are lucky enough to have sufficiently deep pockets, all BMW M-Powers come from the factory with a mechanical limited-slip differential, demonstrating that even BMW themselves know that powerful cars need these important devices.įortunately, there are clever differentials out there on the aftermarket that will transfer torque to the wheel with more traction rather than take it away. Turbo-charged rear-wheel drive cars with high torque outputs suffer the most, such as BMW's M135i, and conditions are worsened by the fact they are equipped with run-flat tyres and stiff suspensions. If you accelerate hard from slow speeds, or try to power out of turns (especially in slippery conditions), the loss of traction will make the engine sap power away from the wheels. The car spins away power in these instances.Īdditionally, BMW and Mercedes use various electronic traction systems that "curb" power to the drive wheels during traction loss (indicated by the flashing traction light on your dashboard). The Dynamic Stability Control system (DSC) is designed to "curb the engine output and stop slip on the wheels", a good feature in theory, but is still in its early stages of development and is way too intrusive, often frustrating the driver when trying to push on. The problem with the open diff is that it can only ever apply the same amount of torque to both driving wheels, so when a wheel slips, it will only put through the amount of torque it requires to power that spinning wheel (very little!). Why do you need a limited slip differential?Īll standard BMW and Mercedes cars come from the factory fitted with the basic "open differential" - a simple device that allows the driving wheels to turn at different speeds (enabling the car to navigate around corners). Quaife even supply FORD as original equipment for their Focus RS range. Successfully used in all forms of motorsport including F1, rallying, circuit racing, rallycross and drifting, they are also ideally suited to high-performance road cars. Quaife is now the world leader in differential technology. ![]() This clever design revolutionised the differential market - offering a superior level of performance and warranties compared to its competitors. The Quaife ATB (Automatic Torque Biasing) differential is a unique type of limited-slip diff that substantially improves traction for powerful vehicles using only gear mechanisms. ![]()
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