Dyno testing shows the M4 CSL makes more than 600 horsepower, 54 ponies more than BMW’s spec


Back in the 1960s and early 70s, many automakers reported lower horsepower numbers for their cars than actually offered in order to keep insurance costs down. It doesn’t happen that often in the modern era, but sometimes some dyno tests reveal some big differences between claimed power and actual power. For BMW, this happened back in 2019 The M5 Competition put 700 horsepower on the dyno, a big difference from the official figure of 617 horsepower. Now there seems to be a similar scenario for recently introduced the M4 CSL.


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How much power does the M4 CSL really have?

The 2022 BMW M4 CSL playfully drifts around the bend.

When BMW unveiled the M4 CSL back in May 2022, it announced that it would be offered with the same 3.0-liter S58 twin-turbo inline-six engine. M4 and M4 Competition. In the latter, the engine delivers a total of 503 horsepower and 479 lb-ft of torque, but in the CSL it was tuned to deliver 550 horsepower, with torque unchanged. That’s a big difference between the two models, but the first dyno testing of the M4 CSL showed that the difference is actually bigger. If the test is accurate, the M4 CSL actually makes 604 horsepower and 530 lb-ft of torque, or 54 horsepower and 51 lb-ft of torque more than officially reported. More importantly, it means the CSL beats the M4 Competition by 100 ponies.

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The test was conducted under controlled conditions, with no atmospheric conditions that did not alter the numbers in any way. That said, we don’t think rain, or wind, or snow will steal 50 horsepower from the CSL’s inline-six engine. So, if the M4 CSL is actually 100 horsepower more powerful than the M4 Competition, and it’s also about 240 pounds lighter, how fast is it? BMW claims the M4 CSL goes from 0 to 60 mph in just 3.7 seconds, with a top speed limited to 155 mph. Can we hope for a real-world sprint from 0 to 60 mph in less than 3.5 seconds?