What kind of gains can you get with Race Gas
What kind of gains can you get with Race Gas
09-17-02, 03:16 PM
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Not necessarily; race gas has a higher octane rating. Octane rating is essentially a gauge to measure the speed at which the combustion consumes the fuel in the chamber. Higher octane ratings burn slower. All that means is that it takes longer to burn the gas you injected..
If the octane rating is too low for your engine, then the fuel mixture will combust too early in the combustion chamber, and the force will slam against the chamber wall, in what's commonly referred to as "knocking". Technically this is called "Pre-detonation". This is what blows apex seals in rotary engines.
If the octane rating is too high, the combustion can potentially occur slow enough that it is still combusting during the exhaust cycle of the engine. On a piston engine, this means the mixture in the cylinder is still expanding during the exhaust stroke, effectivly slowing the return of the piston to TDC. In an FD this can mean that the turbo is consuming a combusting mixture, which is still expending energy. Like little bombs going off in your turbo.
Race gas is effective only with the use of high compression engines (10.5:1 or higher) and in forced induction engines where the boost level is signifcant. (Higher than 1 bar)
This is in theory, however. Real world results may vary.
If the octane rating is too low for your engine, then the fuel mixture will combust too early in the combustion chamber, and the force will slam against the chamber wall, in what's commonly referred to as "knocking". Technically this is called "Pre-detonation". This is what blows apex seals in rotary engines.
If the octane rating is too high, the combustion can potentially occur slow enough that it is still combusting during the exhaust cycle of the engine. On a piston engine, this means the mixture in the cylinder is still expanding during the exhaust stroke, effectivly slowing the return of the piston to TDC. In an FD this can mean that the turbo is consuming a combusting mixture, which is still expending energy. Like little bombs going off in your turbo.
Race gas is effective only with the use of high compression engines (10.5:1 or higher) and in forced induction engines where the boost level is signifcant. (Higher than 1 bar)
This is in theory, however. Real world results may vary.
09-17-02, 05:19 PM
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Race gas
Right on. To add to sszablya post. Higher Octane also burns at lower Temps. That is Why top fuels run Alcohol. It burns the coolest. A stock 7 would only benifit up to about 95 octane. Anything higher and you would start to see a decrease in proformance. You can find lots of Dyno's that show this. (a average car with 91 octane dynoed at 150HP, Then with no other change but 110 octane the same car produced only 142HP.) The only reason you want to run high octane is a charged induction car is the lower combustion temps.
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