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With official ratings of 425 horsepower and 406 pound-feet of torque, you’d expect an at-the-wheels rating of somewhere around 360 horsepower and 345 pound-feet with typical driveline losses.
The figures from Motor Trend’s test of the 2015 BMW M3 on K&N Engineering’s dyno put BMW and the new M3 firmly in the underrated camp (or the highly efficient power-transfer camp): the dyno results showed 379 horsepower and 378 pound-feet of torque. Hit the link to see the dyno graphs and other details.
The nearly symmetrical result is about 5 percent above what might be expected, so it’s not a tremendous underrating, and given the vagaries of results from one dynamometer to the next, it could simply be a spot-on result, matching rated horsepower at the flywheel identically.
But one thing is clear: the 2015 M3 packs some serious punch, and should prove a massive hoot to drive. Look for our first drive review in the coming weeks to find out just how fun it is.