BMW will initially offer the Gran Coupe as three separate models. The automaker’s TwinPower turbo 6-cylinder engine appears under the hood of the standard 640i Gran Coupe. It is powered by BMW's N55 3.0 liter turbocharged inline six which is good for 315 hp and 330 lb-ft of torque in this application. It is capable of accelerating from 0 to 60 miles per hour in 5.4 sec. Moving up the performance ladder, the TwinPower turbo V8 is standard in the 650i and the all-wheel-drive 650i xDrive Gran Coupe, which are scheduled to be rolled out shortly after the 640i. Compared to the current 6 Series coupe and convertible, BMW engineers have managed to squeeze an extra 45 hp and 30 lb-ft of torque from the twin-turbocharged 4.4 liter V8. With 445 hp and 480 lb-ft of torque, the 650i Gran Coupe should sprint from 0 to 60 miles per hour in 4.6 sec. An 8-speed automatic with paddle shift is the only transmission offered with either engine.
According to reports, the 6 Series Gran Coupe is expected make its official introduction at the Geneva Motor Show in March 2012.