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Video: Stock 2012 BMW M5 makes 393kW at the wheels

September 11, 2012

It seems BMW may have underrated one of its cars once again. The guys at BimmerPost recently strapped a brand new and stock standard 2012 BMW M5 to a dyno where it produced 393kW at the wheels (527hp).

According to the factory specs, the new M5 produces 412kW at the engine. Once driveline load is calculated into the equation, this would translate to around 340-350kW at the wheels. As a general rule of thumb, the driveline saps around 15-18 per cent of the engine power.

We loved the M5 beast during our review a few weeks ago. It felt almost sickeningly fast and powerful. And now we know why. With 393kW at the wheels, this would translate to around 465kW at the engine.

Earlier this year we saw a similar sort of thing when a garage tested a stock 2012 BMW 328i (review here) and it produced 169kW at the wheels. With a factory rating of 180kW at the engine, the figure at the wheels would translate to around 200kW at the engine.

It’s not uncommon for car companies to do this. The R32-R34 Nissan GT-R range has perhaps been the most famous example, with its stock 206kW Japanese ‘restricted’ rating. Various enthusiasts the world over tested their GT-Rs and easily achieved this figure at the wheels.

Click play below to see the M5 laying down its grunt on the dyno.

Brett is the editor and founder of PerformanceDrive. He's obsessed with driving, having played with Matchbox cars until he was tall enough to drive a real one. After initially working as a mechanic, Brett earned a degree in journalism and entered media as an editorial assistant at Top Gear Australia magazine. He then worked at CarAdvice.com.au. His dream is to live next door to the Nurburgring in Germany.