It’s quite hard to argue that the BMW M850i either in Coupe or Convertible guise is a slow car. Having tested both, I can wholeheartedly say that I find it hard to imagine just how fast the full-on M8 will be if these two are already this quick. They basically defy the laws of physics and it’s all down to the 4.4-liter twin-turbo V8 under the hood. Reworked for the new generation of cars made by BMW, the N63 engine is now at an all-time high in terms of power.
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While previous iterations of the mill had anything from 400 to 450 HP, the latest version now develops 530 HP and 750 Nm (553 lb-ft) of torque. If on the horsepower meter it falls a bit shy of the S63 mill, the torque numbers are on par with the latest version of the M-developed engine found on the F90 M5. And that’s how the eye-watering speeds the M850i xDrive models are capable of.
And yet, for some people, that’s not enough. Therefore, tuners can have a blast creating upgrades for the 4.4-liter mill that can even top the S63 in terms of figures. The guys from BR-Performance have published a video featuring their Stage 1 upgrade for the M850i. The company claims the upgrade will take the power output up to 680 HP and 850 Nm (627 lb-ft) of torque, an increase of 150 HP and 100 Nm of torque over the standard car.
Considering the M850i xDrive can do 0-62 mph (100 km/h) in 3.6 seconds we’re rather curious to see how this monster performs. It will probably turn the M Performance car into an M5 rival, at least in a straight line. Unfortunately, all we have in the video is the car on the dyno but at least we can hear that V8 roar.