Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

How does the North-American-spec version of the S54-powered M roadster differ mechanically?

April 26, 2017differ mechanically north-american-spec roadster s54-powered version

0

Posted

How does the North-American-spec version of the S54-powered M roadster differ mechanically?

1 Answer

0

Posted

All of the updated M roadsters sold worldwide are powered by the S54 engine, as used in the E46 M3. European-spec versions are rated at 325 hp (DIN), while North American versions produce 315 hp (SAE), which translates to about 320 hp (DIN). The small loss in power can be attributed to the more restrictive placement of the catalysts on North American-spec cars in order to improve cold-start emissions. All S54-powered M roadsters have an electronically-limited top speed of 155 mph (S52-powered M roadsters were limited to 137 mph), though the U.S.-spec model is not equipped with the two-piece floating front brake calipers.