[irmb]

going to the track manana - they have 91 and 100 octane available. Any reason to try 100?

[Fraxum]

no boost AT ALL, not without a tune. but better than crappy 93.

[cmitchell17]

Yes you can try it. I noticed I could not eliminate knock with 89. I only have 87, 89, and 93 around here. I also tried mixing 89 with half 93 to make 91 and it still knocked.

So you may be having knock if the max octane you can get besides 100 is 91. In that case you should experience a very small performance increase with 100, if you don't' already have knock then you wont see any gains. Knock is dependent on a lot of other things as well too though.

[L99BEN]

Originally Posted by irmb

going to the track manana - they have 91 and 100 octane available. Any reason to try 100?

Wont hurt anything. Your car will run more optimal on 100 octane if the available 91 octane is crappy quality.

[TimsZ28]

Higher octane does not help if it's not needed. It will not hurt your car at all as long as it is unleaded. In all reality, if it did anything noticeable it would slow your car down(compared to a good 93). However, if you have a good 91-93 just run that. Save the money as you will not be faster with it for sure. If your only choice it 87-89 or 100 and you are going to the track, grab the 100 for sure.

And Yes saying going from 93 to 100 will slow you down is an exaggeration. However it WOULD slow you down before it sped you up if 93 was enough for your car.

[bpang1234]

If you saw any benefit it would only tell you that your normally used 91, 92 or 93 is crappy. Unless someone slipped a 100 octane map onto your ECU.

[Drags1998]

Don't waste Your Money!!!!!!!!!!!!!!!!!!

[nick_casper]

Power density goes down slighly as octance goes up. You will make the most power with the lowest octane that does not cause knock. That said we are talking imperceivable differences.

[Oil Man]

The Gen-V LT1 is tuned for 93 octane. Running a higher aggregate octane rating is a waste of money.

If you live in a place (like I do) where 93 isn't available at the pump, you can mix 4.25 gallons of 100 octane with the rest of the tank full of 91 to blend up a tank of 93. I do this on weekends when I plan on doing some spirited driving, and then daily drive it on 91 the rest of the week.

[ChevyRules]

Originally Posted by cmitchell17

Yes you can try it. I noticed I could not eliminate knock with 89. I only have 87, 89, and 93 around here. I also tried mixing 89 with half 93 to make 91 and it still knocked.

Why were you using 89 and mixing 89 with 93 to get it to 91? 93 is perfectly fine for the car and is the recommended gas.

[Egon]

We had a similar discussion in the 1LE section a few days ago, you should check it out. http://www.camaro6.com/forums/showthread.php?t=493850 As others have already said here there is no advantage to running 100 octane in a car designed/tuned for 91/93, its just a waste of money.

Even if the car was tuned for 100 octane exclusively you would not see much more than a few HP increase due to the fact that the engine is already designed to achieve peak cylinder pressure on 91/93 and you can't increase peak cylinder pressure without forced induction or changing cyl geometry. (to increase compression ratio) So save your money.

[ctrlz]

Originally Posted by nick_casper

You will make the most power with the lowest octane that does not cause knock. That said we are talking imperceivable differences.

First part... absolutetly agree!
Second part... your wallet will notice the impact!

[TJay74]

Originally Posted by Oil Man

The Gen-V LT1 is tuned for 93 octane. Running a higher aggregate octane rating is a waste of money.

If you live in a place (like I do) where 93 isn't available at the pump, you can mix 4.25 gallons of 100 octane with the rest of the tank full of 91 to blend up a tank of 93. I do this on weekends when I plan on doing some spirited driving, and then daily drive it on 91 the rest of the week.

This is exactly what I do as we don't have 93 here in Oklahoma. I do have 100 octane just down the street from me. Though from the info I found on the tank size the mix ration is closer to 6 gallons of 100 to the rest of the tank will get you to 93.6 octane.

So with that OP, 4-6 gallons of 100 octane and the rest being 91 octane will get you to around 93, but I wouldn't run pure 100 octane as the higher the octane the slower the fuel burns as this is how it combats spark knock.

So as said, higher octane fuels burns slower and could potentially produce less performance if it is not needed.

[slick3]

Unless you are simply trying to reduce the chance of knock, no it's a waste. At the race track (road course.) You could add a few gallons to raise the overal octane rating of your fuel and reduce the chance of detonation. No other logical reason to run it is coming to mind