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Corvette
Corvette Performance
High octane unleaded, where to get in the GTA?
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<blockquote data-quote="Afterimage" data-source="post: 273792" data-attributes="member: 7676"><p>Engine is stock and I will say that you are incorrect. Substantial testing by a certain automotive writer that has his own ZR1 and lives in California notes that stock untuned C7 ZR1 PCM system will pull timing even on high octane 93 fuel and will be even worse if running the car hard in hot conditions and a lot worse if your CAC system is not properly bled. When mixing 91 octane fuel (the highest octane they have in California) with 100 octane fuel gives an approximate mixture of 96 octane and that is the sweet spot where the untuned PCM can take advantage of the higher octane and keep the timing cranked.</p><p></p><p>We'll find out next month. I plan to run the car first on fresh 94 PC fuel then dump the new bottle of octane booster in, run it thru the system and we'll see if there is a difference. My dual CAC system is bled so I know my car won't pull timing because of a premature heat soaked SC system. If the MS109 isn't stupid expensive as mentioned above I would get some. GM also mentioned in the OM that if tracking a ZR1 they want you to run 100 octane fuel so up to that octane level the PCM can take advantage of the better fuel you put in.</p></blockquote><p></p>
[QUOTE="Afterimage, post: 273792, member: 7676"] Engine is stock and I will say that you are incorrect. Substantial testing by a certain automotive writer that has his own ZR1 and lives in California notes that stock untuned C7 ZR1 PCM system will pull timing even on high octane 93 fuel and will be even worse if running the car hard in hot conditions and a lot worse if your CAC system is not properly bled. When mixing 91 octane fuel (the highest octane they have in California) with 100 octane fuel gives an approximate mixture of 96 octane and that is the sweet spot where the untuned PCM can take advantage of the higher octane and keep the timing cranked. We'll find out next month. I plan to run the car first on fresh 94 PC fuel then dump the new bottle of octane booster in, run it thru the system and we'll see if there is a difference. My dual CAC system is bled so I know my car won't pull timing because of a premature heat soaked SC system. If the MS109 isn't stupid expensive as mentioned above I would get some. GM also mentioned in the OM that if tracking a ZR1 they want you to run 100 octane fuel so up to that octane level the PCM can take advantage of the better fuel you put in. [/QUOTE]
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Corvette
Corvette Performance
High octane unleaded, where to get in the GTA?
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