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Just wondering how many 06 / 07 Z06 owners are using 100 octane vs the more easily found 92 octane.

Do you feel there is a significant difference in performance?

Are you using additives to boost the octane?

Any negatives to using 92?
 

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OEM Tune on the C6 Z06 includes tables for both 91 and 93 Octane fuel. My car is tuned for 93 Octane and I am careful about what fuel I put in the car. I used 100 Octane Sunoco at a track day and could not tell any performance difference from 93 Citgo.

:cheers:
 

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OEM Tune on the C6 Z06 includes tables for both 91 and 93 Octane fuel. My car is tuned for 93 Octane and I am careful about what fuel I put in the car. I used 100 Octane Sunoco at a track day and could not tell any performance difference from 93 Citgo.

:cheers:
You have to have the entire tank with 100 octane (no mixing) and to run the car on 100 before the track day, preferably consume a tank of 100 gas before. The auto-adjustment of ECM for using higher octane is very slow.
Another option would be to reset the ECM using LS7edit or similar so it would start with aggressive timing.

More than this, if you want to take full advantage of 100 octane gas you must have the ECM re-flashed with a specific tune/program.
Especially when using Sunoco gas which has 15% ethanol.
After that you will be able to tell the difference at the track.
 

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Mixing

I have been mixing 4 gallons of 100 octane with every fillup to get an octane rating of 93-94 since I picked up my car in September of 2005. I have been told those running on 91 octane will not develop full Horsepower even thought the car will run.

I also have a Diablo Tune which leans out the fuel a bit so I was told to stick to the mixing. I also understand that running above 93 will do no harm but will provide no additional gain.

I'm not an expert on this and am making no personally guaranteed claim but I do lots of research and listen to guys who have more racing experience than I do.
 

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I have been mixing 4 gallons of 100 octane with every fillup to get an octane rating of 93-94 since I picked up my car in September of 2005. I have been told those running on 91 octane will not develop full Horsepower even thought the car will run.

I also have a Diablo Tune which leans out the fuel a bit so I was told to stick to the mixing. I also understand that running above 93 will do no harm but will provide no additional gain.

I'm not an expert on this and am making no personally guaranteed claim but I do lots of research and listen to guys who have more racing experience than I do.
I am not saying that mixing is bad. Any octane increase is good. :thumbsup:

You are right that more than 93 octane would bring no benefits with the stock ECM program. A specific tune is required for benefiting from higher octane. With such a program and 100 octane gas I say that even 40 HP increase is possible.
 

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new 2006Z06

out here in CA we don't have 92 or 93 or even 95 octain. I use 100 octain and find that my z06 is a bit snapper then with 91.
 
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