2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front 3/4 view

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear 3/4 view

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front 3/4 view

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear 3/4 view

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 side view

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front view

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear view

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 driving

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front detail

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 grille

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 headlight

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 headlight

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 headlight

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 logo

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front fascia

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 hood

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 wheel

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 wheel

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 wheel detail

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 wheel

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 side vent

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 side vent

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 side mirror

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 side detail

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear detail

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear detail

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear spoiler

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 taillight

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 taillight

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 badge

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 logo

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 badge

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear fascia

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 exhaust tips

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 engine

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 engine

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 engine

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 engine

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 engine detail

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 interior

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 interior

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 interior

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 interior

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 steering wheel

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front seats

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 steering wheel controls

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 paddle shifter

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 paddle shifter

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 gauges

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 speedometer

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 tachometer

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 sport plus mode display

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 navigation system

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 dash

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 shifter

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 shifter

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 drive modes

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 center console buttons

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 dash buttons

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 pedal

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 seat controls

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 sill plate

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 door

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 door controls

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear seats

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear seat climate controls

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 rear door

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 trunk

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 transmission

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 transmission

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 transmission

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 transmission

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front suspension and brakes

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front brakes

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 front brakes

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 differential

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 differential

2012 BMW M5
  • 2012 BMW M5
  • 2012 BMW M5 differential

With the 2013 BMW M5 finally going on sale in the U.S., we definitely saw this coming. BimmerBoost recently got a hold of 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-liter 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-percent drivetrain loss – if accurate, the new M5's losses would be just six percent. Using the 15-percent 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.


I'm reporting this comment as:

Reported comments and users are reviewed by Autoblog staff 24 hours a day, seven days a week to determine whether they violate Community Guideline. Accounts are penalized for Community Guidelines violations and serious or repeated violations can lead to account termination.


    • 1 Second Ago
  • From Our Partners

    You May Like
    Links by Zergnet
    Share This Photo X