Quote:
Originally Posted by lucid
Guys, we discussed this multiple times. Although the compression ratio is obviously mechanically fixed (there are experimental engines that have variable compression ratio btw), there some kind of margin for adjusting the timing, and if you put in higher octane fuel, to a certain extent, you get some benefit. After a certain point, increasing the octane does not make a difference. We have seen data on the E92 M3, and the E46 CSL that proves this.
I also remember seeing one of the British TV programs testing a bunch of off the shelf "octane booster" in a proper engine lab. If I can remember correctly, none of them increased output, and some actually decreased output. I don't remember which products they tested exactly though or what the test engine was.
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+ 1000 Lucid!!!
Quote:
Originally Posted by J08M3
As far as I know this is false info. Higher octane will not cause any damage to your engine. It will only cause damage to your wallet. It does have the possibility to improve performance since higher octane fuel burns slower. The slower burn of the fuel is good because it will continue to burn for a longer period during the power stroke of the engine. This is a benefit because power will continue being created during the expansion of the burning gasses for a longer period of time instead of a quick explosion then nothing more for the rest of the power stroke. For best performance you the most complete and slowest burn of the fuel.
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Agreed, higher octane would not damage your engine at all!!!! My bad!! It just won't make, for the most part, any difference above the point where your car's ECU was tuned.