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Discussion Starter #1
Now if you know you are going to be racing the car, like at a drag strip. What is the highest octane fuel you can run in a stock internal LS motor? Now what ever that octane level is, would there be much performance gains?

Just wondering, so thanks ahead time.
 

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Now if you know you are going to be racing the car, like at a drag strip. What is the highest octane fuel you can run in a stock internal LS motor? Now what ever that octane level is, would there be much performance gains?

Just wondering, so thanks ahead time.
You can run any octane unleaded fuel, but it will net zero gains unless your car is tuned for it...
 

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Isn't higher octane fuel mainly for high horse power motors? There really isn't any need for higher octane fuel in stock motors.
 

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If you aren't running some sick power or the car hasn't been tuned for it, I wouldn't bother with it.
 

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You can run any octane unleaded fuel, but it will net zero gains unless your car is tuned for it...
actually it is worse. Throw some 100+ octane in your car when you are tuned for 93 and you'll slow down. Tested it at the track. Nothing like buying uber expensive gas and going slower for it.
 

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Isn't higher octane fuel mainly for high horse power motors? There really isn't any need for higher octane fuel in stock motors.
High octane is only needed if you run very high compression, or lots of boost... Most engines will benefit from it if they are knock limited since the high octane will allow more timing and thus more power. On a stock-ish engine the potential gains are small and not worth the $6+ gal cost of the fuel.

actually it is worse. Throw some 100+ octane in your car when you are tuned for 93 and you'll slow down. Tested it at the track. Nothing like buying uber expensive gas and going slower for it.
I agree. That is very true depending on the particular fuel you use; most high octane fuels are slower burning and don't just allow you to run more ignition timing: they need it, and you lose power if you run them on a stock motor :coffeetime:
 

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I ran out of fuel at the track so I had no choice but to run it. It was late in the day or I would have tried bumping the timing to see whether I could have run faster, or at least come back to what I was running.
 

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You can run any octane unleaded fuel, but it will net zero gains unless your car is tuned for it...
:iagree: unless you are getting some knock (detination) there is no reason to run it, and even then maybe a gallon or two.
 

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I ran out of fuel at the track so I had no choice but to run it. It was late in the day or I would have tried bumping the timing to see whether I could have run faster, or at least come back to what I was running.
Was the reduction in power that noticeable?
 

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I was down a couple tenths.
 

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Discussion Starter #13
You can run any octane unleaded fuel, but it will net zero gains unless your car is tuned for it...
OK, so next question: Is it possible to have 2 tunes on these cars? One for every day driving and flip switch for something at track for more aggressive driving and fuel?
 

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OK, so next question: Is it possible to have 2 tunes on these cars? One for every day driving and flip switch for something at track for more aggressive driving and fuel?
No. But you can have as many tunes as you'd like on a computer and then flash the computer with a different tune whenever you feel like it. You can use HP tuners or EFI Live for that. Both are about $600.
 
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