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      03-25-2021, 01:16 PM   #13
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Drives: 335i, i3
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Don't assume that the same tuning headroom is available. There is a fundamental limit to what can be achieved based on the combination of compression ratio and fuel octane. The S58 has a lower CR so will tolerate a higher BMEP (torque) at a given fuel octane, so that's good and explains some of the difference between the engines. But BMW is also delivering the engine in a much higher state of tune from the factory (meaning higher BMEP), mostly driven by marketing since I'm sure they decide what HP/TQ number that needs to be hit, and the engine gets tuned accordingly.
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