Chicago-based tuner IND takes the new F10 BMW M5 to a dyno test. On the dyno jet setup at AMS Performance shop, the F10 M5 shows again that BMW has underrated the engine. The new M5 is powered by the S63 V8 4.4 liter TwinTurbo delivering 560 hp (412 kW) at 5,750 – 7,000 rpm, and maximum torque of 500 lb-ft (680 Nm) on tap between 1,500 and 5,750 rpm.

After 40 minutes of dyno runs, the IND folks found that the engine in the M5 outputs 527 rear wheel horsepower. The typical drivetrain loss is 15 percent, so in this case the expected rear wheel horsepower would be 476 (calculation based on the 560 horsepower measured at the flywheel). BMW has been known for years to not engage in a “horsepower war” and most of the engines were reporting less power on paper.

But in this case, the flywheel and official power output seems to be realistically slightly above 600 horsepower. We expect many tuners to come out with their own upgrades to the engine that will reveal the true power of the S63Tu.

IND performed datalogging of intake air temperature, throttle position, boost pressure, engine oil temperature, and water temperature to start. More data will be gathered moving forward.

Stay tuned!