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Re: Hi octane=no benefit unless high boost/compres (archive)

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Posted by PM3 on May 16, 1999 at 19:04:11:

In Reply to: Hi octane=no benefit unless high boost/compression posted by Manoj on May 16, 1999 at 17:04:01:

Don't worry, no insult toward anyone taken, I would imagine, :-) But contrary to the logic presented here I have a copy of two dyno runs equaling an additional 20 or so HP from a 350HP(crank) supercharged M3 on 103 octane....From what I've learned/experienced, the car runs better when you are modified, even somewhat like just with chip/exhaust/intake/flywheel/etc...PM3
PS, plus, I used to (sometimes) have a slight hesitation (very slight) at around 6K RPM in 3rd-5th gears, but I never do when running even 1-2 gallons of this stuff in a full tank....


: I don't mean to be insulting, perhaps everyone on this thread already knows this, but...unless you're running very high boost (like the guy who can dial it up to 18 psi) or higher than stock compression, extra octane numbers are a waste of money. The higher number refers to resistance to detonation, so unless you're knocking on premium with your current setup, you won't gain "power" at all with a higher octane. The usual supercharged M3's would not benefit from much beyond 93 octane.




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