Quote:
Originally Posted by BigKutta
I think there is 0 benefit going higher than the recommended octane. I dont think it buys you speed, performance,etc. Maybe if your engine is knocking, which it shouldn't with 91/93 octane
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Not sure if this is true with modern BMWs though because of the VANOS and the DMEs ability to change timing. I seem to recall a Steve Dinan video on YouTube where he breaks this down and how it works on modern turbo BMWs (without a tune) vs older NA cars. We aren't talking about 50hp here (that requires a tune), but some benefit. Though 100% agree that need a tune to fully realize any substantial benefit.
Though I could be remembering wrong. If you are in a 91 state, mixing in some higher octane definitely helps get up to 93+. There is an appreciable difference on a dyno with a car on 91 vs a car on 93.
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