The BMW M4 CSL Makes Way More Power Than It's Supposed to on a Dyno

Just as the sun rises and sets, BMW publishes conservative horsepower and torque figures. The German owner of a new M4 CSL put their car on the dyno and got an astonishing result—596 hp and 531 lb-ft of torque. BMW, for reference, advertises the M4 CSL at 543 hp and 479 lb-ft.

It's better for automakers to under, rather than overrate horsepower to avoid false advertising, but we can't help but wonder how BMW arrives at its power and torque figures. Is its dyno on the top of the mountain? Do engineers turn the heat to 120 degrees? Does whoever is responsible for publishing final figures just subtract 10 percent? Who knows. What we do know is that it is routine for BMWs to make far more power than advertised.

This also explains why the M4 CSL is so fast. BMW cut out an additional 240 pounds from the M4 Competition for a 3640 curb weight. The power-to-weight ratio on the CSL is far better than the Competition, and when you add super-sticky Michelin Pilot Sport Cup 2 R tires to the mix, you have a potent machine.

Too bad it can't outrun it's own face.

Just so sad for that botched rhinoplasty.

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