mbeebe

Has anyone run a dyno with 100 vs. 93? Does it have a noticable effect at the track? Also, would putting octane booster in 93 octane gas have the same effect as just buying 100 octane?

SL1200MK4

I don't think it will make much of a differernce unless you have a upgraded ECU (chip tuned)

Bitium

In our cars there will be no difference. If you are running 100 octane instead of 93 octane/17 hepatane, the car wil have no use for it. Unless you have a highly modified high compression engine, you don't need any higher octane or pure octane 100.

The only thing octane does is prevent premature detonation. Cause by heat/compression.

They call them octane boosters or whatever, but they don't just add octane, but other fuels or chemicals. Is totally different.

Bitium

An ECU or chip tune has nothing to do with octane rating.

TowerOfLove

nothing happends. All octane does is allows you to compress the gas at higher compressions before it goes off. thats y TL's use supreme only, bc the gas needs to take higher compression in order to generate hp. you have like a Type R with like 11 : 1 compressoin :-D higher occtance might be better

ChucksCL-S

Higher octane sounds like "higher horsepower" but it is not. It is "higher ability to not predetonate" so to speak. As the piston comes up during the compression stroke, the air-fuel mixture is being squeezed and therefore heated. At some point the fuel will explode itself without the aid of the spark plug, resulting in a rising piston violently meeting the exploding mixture prematurely. The piston has nowhere to go but to shake inside the rings on the way down. This is knock, or predetonation. Very harmful. On some newer cars knock sensors listen for this and can back off on ignition timing to avoid the damage. With higher octane this whole scenero is avoided as the fuel air mixture won't self detonate, allowing higher compression ratios (as in the type-S) and the spark happening at the right time. You want the explosion to occur just as the piston is reaching TDC (top dead center) so as to give it a good even push downward for the powerstroke. Earlier and you get knock, too late and you just loose power. Hope this helps.