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#1 (permalink) Old 02-20-2012, 05:43 PM
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High Octane Fuel

Got a question, will high octane 93+ or even as high as 105 make any performance gain on a 99 M3 with naturally aspirated engine and non chipped ECU?
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#2 (permalink) Old 02-20-2012, 07:12 PM
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Long story short, no. If it was Forced Induction maybe, due to higher compression ratios it would help reduce detonation. On a stock NA car it will do nothing but waste your money.

Go to Top Tier Gasoline. using a Top Tier brand of gas would be better for your car.


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#3 (permalink) Old 02-20-2012, 09:09 PM
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Nice, thanks for the info. So if i supercharged the car down the line I would feel gains from a higher octane? Or if I were to just buy a 135 with the turbo'd six?
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#4 (permalink) Old 02-20-2012, 10:53 PM
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If you were to Turbo it, then possibly. Depends on a lot of factors, including compression ratio. Supercharging usually keeps the same compression ratio IIRC. I was looking into getting the Active Autowerks supercharger kit for my car and with the software they use, they tell you to use at minumum 91 Octane. I have 94 octane available at several gas stations and i really dont think the cost is worth it. Even with the 135, I dont see the cost worth it. Run 91 octane and you will be fine.


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#5 (permalink) Old 02-21-2012, 04:40 PM
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Just in case one opinion isn't enough. No it will not.
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#6 (permalink) Old 02-24-2012, 05:08 PM
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Indeed - if your car is TUNED for it - sure there is a big difference. DINAN tuned my stage 4 race kit S3-R ///M3 for 100 octane or greater and it performs way better. On an NA car - save your $$$ - although I'd still do 93 not 91.


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#7 (permalink) Old 02-24-2012, 05:30 PM
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Would there be gains on a 93 from a 91?
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#8 (permalink) Old 02-24-2012, 06:21 PM
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