The M850i’s twin-turbo V-8 still displaces 4.4 liters, but the engine has been redesigned from the crankcase up and now makes 523 horsepower and 553 lb-ft of torque.
Not only is that up 78 and 73 units, respectively, over the old 650i, it’s down only 37 horsepower from the old M6’s engine and actually up 53 lb-ft of torque.
Not that the M850i isn’t plenty exciting. With a launch-control program that effectively neutral slams the ZF eight-speed on the all-wheel-drive system, it hits 60 mph from rest in just 3.5 seconds and rips through the quarter-mile in 11.8 at 119 mph.
