AC Schnitzer is a tuning company known for upgrading BMWs and that is exactly what they have done with their ACZ 5.0d concept. They started with a BMW Z4 sDrive 23i and swapped the factory motor for a triple-turbocharged 3.0 L straight-six M50d from a BMW M550d. The engine’s power has been increased from 375 hp and 546 ft-lb of torque to 424 hp and 619 ft-lb of torque.
The rear end was changed to a limited slip differential from a BMW E92 M3 and the transmission to a eight-speed automatic with paddle shifters. AC Schnitzer didn’t limit the build to power only. The car was put on a nice diet, losing a total of 288 lbs thanks to carbon fiber roof/trunk lid, lightweight wheels and exhaust system. All these changes account for a 0-62 mph in 4.5 seconds and a top speed of 185 mph.
They claim the car was built only for development but they did release the build price of €113,965 (approximately $121,388). Which means if anyone has that kind of money and wants one, AC Schnitzer would be more than happy to build it for you.
Watch from inside the cabin as the Z4 takes a lap around Sachsenring race track.