![]() ![]() BMW has tried to compensate by using traction control that cuts power at the engine or applies the brakes to retard wheel spin (or a combination of both). Limited Slip Upgrades - Sadly, many BMWs today are not equipped with a limited slip (posi-traction) differential. If you can trade outright top speed for faster acceleration at daily speeds then this is the perfect upgrade for you. By using a shorter (numerically higher) final drive ratio you are increasing your RPM relative to road speed - this puts you in a more powerful RPM range than before! Since you're in a 'meatier' part of the power band you're now putting down more power/torque to the ground. Ratio Changes - Changing the differential gearing is one of the best and most-effective upgrades you can make on any BMW (old or new). We also design and supply bushing options to reduce driveline wind-up, finned differential covers for better cooling, and more! The options are almost endless! Every custom-built diff is fully rebuilt with seals and bearings. You can purchase the ring & pinion gear sets on their own (professional installation required) or have us build a diff around your own specifcations. Our differential options vary from gearing upgrades to limited slip conversions. The engine is not the only place to make the car faster. It's easy to forget that the differential is a source for making your car faster and handle better so it's often overlooked. Upgrading various parts of the differential can have tremendous benefits in your car's performance.
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