Torsen
Audi uses a mechanical "Crown Wheel" center differential for all longitudinal implementations using dual-clutch transmissions, such as the 2013/14 S4/RS4.The planetary gearset allows a Torsen III center differential to distribute torque unevenly between front and rear axles during normal (full traction) operation without inducing wind-up in the drivetrain.In Hummer/HMMWV applications, there are both front and rear Torsen differentials, so the use of the main brakes will operate this "trick" on both axles simultaneously.Torsen differentials are used in many of the various Audi quattro models, excluding the A3 and S3 and TT, which have transverse-mounted engines and use Haldex Traction 4WD systems.It is also used in the third- and fourth-generation Toyota Supra (Optional) and third-generation Toyota Soarer, the B5 platform revision of the Volkswagen Passat 4motion (based upon the Audi A4), Mazda MX-5/Miata 1994 to 1995 have a Torsen Type I and late 1995 to 2002 models have a Torsen Type II, the 2002-2003 model year of the Nissan Maxima SE 6 speed manual, the Honda S2000, and 1999-2002 S15 Nissan Silvia Spec R. The Lancia Delta Integrale, the Peugeot 405 T16, as well as the 1999-2002 model Pontiac Firebird and Chevrolet Camaro, had a Torsen differential.AMG offered Torsen differentials as an option as early as 1988 for new as well as for retrofitting for 107, 116, 123, 126 series Mercedes Benz cars.