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      09-26-2020, 11:26 AM   #12
Avaley
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Quote:
Originally Posted by CanAutM3 View Post
Manufacturers cannot cheat on power ratings, it is governed by strict standards. However, modern turbocharged engine behave in a certain way that make them seem underrated relative to the testing standards. So comparing the official power ratings of previous NA engines with the modern turbo engine in not apples-to-apples. However, comparing the S55 to S58 is. The S58 will not seem any more underrated than the S55 was.
Fair point.

There is an S58 dyno thread that got moved to the versus page.

Based on the preliminary dyno numbers, the S58 dyno numbers as a relative percentage from the factory are more underrated than the S55, and X3M have thus far shown a larger overhead for S58 tuning than one would expect.

Drivers of both S55 and S58 acknowledge an improvement in power and throttle response for the newer engine which should be no surprise.

The more important question the S58 make up for the 300lbs?
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