The M850i xDrive coupe is powered by a twin-turbo 4.4-liter V-8 putting out 523 horsepower and 553 pounds-feet of torque (from a low 1,800 rpm). The power flows through an eight-speed automatic and standard rear-biased, torque-vectoring all-wheel drive. Paddle shifters on the steering wheel and a launch control system are also standard. BMW estimates zero-to-60 mph in 3.6 seconds and an electronically limited top speed of 155 mph.
Performance systems standard on the M850i xDrive include an electronic locking rear differential, an adaptive M sport suspension, active rear-wheel steering and M active roll stabilization.
You can wake the neighbors, or not, thanks to a standard flap-controlled sport exhaust system, which is keyed to the 8 Series’ mild-to-wild driving modes. BMW says the exhaust note is “particularly distinctive” with the most aggressive Sport Plus setting. Have at it.
An interesting electronic transmission control system uses data from the navigation system to alter the transmission’s shifting to suit current driving conditions, including downshifting early when approaching intersections and minimizing unnecessary shifts between closely grouped corners. BMW also uses navigation data and sensors that read the movement of other vehicles to avoid unnecessary activation of the stop-start system in various situations — pausing at a yield sign, for example.