B5 Audi S4 Gets Porsche Rear LSD, Learns to Powerslide and Do Donuts [Video] - autoevolution

One interesting project that's sure to make headlines in coming weeks is this old 2001 Audi S4 quattro that's been fitted with a limited slip differential and can now do the cool sideways stuff really well. The diff came from a Porsche, a really old one at that. You might remember the 944 Turbo as a child of the 80s, built until 1988, when it was replaced by the Turbo S. Power came from a then respectable turbocharged and intercooled version of the regular model's engine, pumping out 220 PS. The models... Right after the Torsen central differential splits power between the axles, the LSD that's been integrated into the rear transfer case helps keep everything in check and ensures the all-wheel drive S4 can get beautifully sideways. Why use a limited slip differential. The natural tendency of the power is to travel on the path of least resistance, causing massive wheel slip. Source: www.autoevolution.com