Posted Sep 7th 2012 2:15PM
With the 2013 BMW M5 finally going on sale, we definitely saw this coming. BimmerPost recently got a hold of an engine dyno run for the new M5, and is reporting that the car's twin-turbo V8 is "severely" underrated.
Officially, the M5's 4.4-litre V8 is rated at 560 horsepower and 500 pound-feet of torque, but the dyno graph reveals numbers at the rear wheels to be 527 hp and 476 lb-ft in completely stock form. While the idea of the engine being underrated is just an assumption, the general rule of thumb is a 15-per cent drivetrain loss – if accurate, the new M5's losses would be just six per cent. Using the 15-per cent rule, the 2013 M5 would lay down 476 hp at the wheels.
The idea of BMW underrating its engine outputs is nothing new. Earlier this year, the new 328i show some impressive numbers of its own.
Click here for additional images and a short video of the mighty BMW M5 in action.