Quote:
Originally Posted by Zeph
I don't see how race gas would help the M3 (normally aspirated) unless the compression ratio is really high. With 91 octane you can max out 10:1 and with 93 octane you could do higher. I think 11:1 ratio only needs about 95-97 octane. That is why you see Rustangs running 87 octane. Anything higher is a waste, they are only 8.5:1 compression. Well, they were... dunno about the new ones.
Boost is a totally different issue.
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I'm pretty sure the 335i has at least 10:1 static compression.And it runs fine on 91 octane at stock boost levels, and map#7 on mine as the DD.
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2011 Alpine 335d M-Sport 12.34 @ 110.48mph
2019 i3s Terra,
2008 Black 335i Sedan. 11.11@ 129.47 mph
2008 Monaco Blue JB3 2.0 335i Coupe. 11.33 @ 132.77 mph, 60-130mph: 6.95 seconds
2023 i4 M50 11.48 @ 121.56mph, 3.43 0-60 (dragy)