The 2013 BMW M5

2013 BMW M5 packs more horsepower than advertised

Even though the horsepower war raging across the global automotive industry is all about having a few more ponies than your nearest competitor, the act of underrating your big dogs is as popular now as it was in the 1970s – with the most recent news of a production car making more power than advertised being the 2013 BMW M5 sedan.

The 2013 BMW M5 is powered by a twin turbocharged 4.4L V8; an engine that is supposed to offer 560 horsepower and 500lb-ft of torque. This output makes the new M5 one of the most powerful sport sedans in the world but according to the folks at the BMW enthusiast community BimmerBoost, the M5 is more powerful than advertised – a whole lot more powerful.

A dyno sheet posted with the test results of a factory stock US-specification 2013 BMW M5 shows that the high performance sedan puts 527.18 horsepower to the ground around 6,600rpm with the peak torque measuring 476lb-ft right around 3,200rpm. Mind you, that is power at the wheels whereas stated horsepower is at the crankshaft but compared to the stated figures of 560hp and 500lb-ft of torque – the actual power at the wheels seems to be a bit higher than they should be. The difference between the stated horsepower figure of 560 and the power at the wheels of 527 means accounts for only a 6.3% drivetrain loss while the torque lost is only around 5%. The industry standard that is typically used for a rear wheel drive car in terms of expected “loss” between the engine and the wheels is 15%, which would suggest that the M5 should put around 476 horsepower and 425lb-ft of torque to the rear wheels. This means that the 2013 M5 is either the most efficient vehicle ever in terms of drivetrain losses – or the German automaker underrated the power output of their super sedan.

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