The fastest BMW on Hockenheim comes from Aachen: The AC Schnitzer ACS4 Sport – based on the BMW F82 M4 – has recorded a lap time of 1:09.5 minutes. BMW’s “standard” M4 was a full 3.6 seconds behind.
Thanks to extensive weight reductions, the AC Schnitzer ACS4 is exactly 106 kilograms lighter than the production series M4. The engineers at AC Schnitzer gave their car 510 horsepower and 476 lb-ft of torque. The engine sound was also improved by their in-house built exhaust system with carbon fiber tailpipes.
To improve the ride dynamics, the tuning shop offers two suspension kits that lower the car by 1.0-1.2 inches in front and 0.4-0.6 inches in the rear, or 1.2-1.6 inches front and the back by 1.2 inches with the adjustable racing option.
Only a racing bucket seat for the driver remains in the interior and even the battery in the rear was replaced by a 8.5 kg lighter lithium-ion battery from Porsche.
The basis for the aerodynamic pack is the carbon front spoiler elements, which can be fitted both individually and as a basis for the racing bodykit. The AC Schnitzer front aerodynamic pack for the M4 includes the carbon front side wings. These are mounted on the front skirt in pairs on the right and left (4 pieces in the set). This arrangement improves air flow along the vehicle sides, further optimizing downforce on the front axle.
Michelin Cup tires with Corvette specification were added to teh car. The result is a lap time that it’s faster even than the latest version of the Porsche 911 GT3.