Highly oxigenated fuel

[giant_g2]

Anybody use highly oxigenated race fuel, like EXO2? Can the 1LE fuel system handle the increased fuel flow required without going lean? I'm guessing the pump is fine since it's from the ZL1, but I wonder how the injectors would handle it. I think it requires an extra 5% of fuel due to the oxygenation. I'm just wondering in case I do a track day and want/need to fill up with race gas. I'd also be interested to see dyno comparisons with street gas. They say it can increase power by 3%.

[1Slow6.2]

I'll be the one to break your heart and not really give you the answer you want to hear. If you're not tuned on race fuel.. You are pissing away your dollars in the tank. Based on premium (street gas) should be high enough octane to compete in any track day. Sure the higher the octane will help with "pinging" or "detonation" if you're having any of those issues I would look into the fuel you're filling up with per say. But you won't see any extra benefits of filling up with race fuel w/o being tuned on it. Ie adding timing to the calibration to be more aggressive with said fuel( race gas)


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[vinman]

The 1LE's also have the ZL1 injectors I believe

[b20]

Originally Posted by 1Slow6.2

I'll be the one to break your heart and not really give you the answer you want to hear. If you're not tuned on race fuel.. You are pissing away your dollars in the tank. Based on premium (street gas) should be high enough octane to compete in any track day. Sure the higher the octane will help with "pinging" or "detonation" if you're having any of those issues I would look into the fuel you're filling up with per say. But you won't see any extra benefits of filling up with race fuel w/o being tuned on it. Ie adding timing to the calibration to be more aggressive with said fuel( race gas)


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I tested this on the dyno last year my car lost power on race gas until we tuned for it
lost 15whp on 110 oct. tuned we got it all back plus 3 whp
I say not worth the money

[giant_g2]

Originally Posted by 1Slow6.2

Based on premium (street gas) should be high enough octane to compete in any track day.

I know the higher octane won't help me, but with more oxygen in the gas (10% by weight) it'll burn more gas. It's supposed to act as a very weak supercharger or turbocharger allowing you to burn more gas per cylinder, adding 10-20 hp. Now that's just what I've heard and read in a lot of places and I completely understand that anything over 93 octane won't help me.

[giant_g2]

Originally Posted by b20

I tested this on the dyno last year my car lost power on race gas until we tuned for it
lost 15whp on 110 oct. tuned we got it all back plus 3 whp
I say not worth the money

That's interesting. Do you have any idea of what caused it? Was it running lean and the standard tune wasn't spraying more gas?

[giant_g2]

Originally Posted by vinman

The 1LE's also have the ZL1 injectors I believe

I wonder if the factory tune can use them to correct the air/fuel with 10% oxygenated gas.

[1Slow6.2]

The factory tune is only as good as its from the factory. It won't pick up that you're using anything over 93 or 91 whatever is a available in your area (premium) whatever fuel you use its only to go run on that. Just cause it has ZL1 injectors doesn't mean anything. The duty cycle are already predetermined based on the factory tune. Unless you are going to TUNE( efi live, hp tuners, etc...) to change the duty cycle and how much fuel is being injected to the Cylinders at given points once again still a waste of money


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[giant_g2]

Originally Posted by 1Slow6.2

The duty cycle are already predetermined based on the factory tune. Unless you are going to TUNE( efi live, hp tuners, etc...) to change the duty cycle and how much fuel is being injected to the Cylinders at given points once again still a waste of money

Ok, so it sounds like the factory tune isn't smart enough to see the O2 sensors reading that lean and increase the injector output by 5%. That's what I needed to know.

[b20]

Originally Posted by giant_g2

That's interesting. Do you have any idea of what caused it? Was it running lean and the standard tune wasn't spraying more gas?

it was mostly timing
a/f was lean but timing made all the power

[CamaroDreams76]

Originally Posted by giant_g2

Ok, so it sounds like the factory tune isn't smart enough to see the O2 sensors reading that lean and increase the injector output by 5%. That's what I needed to know.

Correct but the o2 sensors are smart enough to throw a CEL.

Like a few have said, race gas is useless for performance gains on a factory tune. BUT if you get bad gas and you datalog and are reading knock retard, using race gas can cure KR readings. It can hurt and it also can help. Just depends on your situation.