Which Octane for L36? - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-20-2006, 12:45 AM   #21
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Quote:
Originally Posted by MACDRIVE
What about the notion of the PCM advancing the timing (less KR) with an increase in octane? I've heard that speculation numerous times on the board.
If you have KR issues, then you will gain power by going with a higher ocatne fuel because the PCM will advance your timing. However, most stock PCM L36 cars shouldn't really get any KR. WIth a PCM most will need premium though.
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Old 11-20-2006, 12:54 AM   #22
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Quote:
Originally Posted by dbtk2
If you have KR issues, then you will gain power by going with a higher ocatne fuel because the PCM will advance your timing. However, most stock PCM L36 cars shouldn't really get any KR. WIth a PCM most will need premium though.
You see willwren, this is what I was talking about.
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Old 11-20-2006, 01:00 AM   #23
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I think he'* referring to a performance PCM with advanced timing at WOT (vs stock timing). In that case you NEED higher octane to stop KR. With stock timing tables, running 93 won't increase your timing over the stock values. The only way timing would be "advanced" would be by eliminating KR and basically returning your car to it'* STOCK power potential.

Do you have KR while running 87? If not, you're not going to gain anything else.
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Old 11-20-2006, 01:07 AM   #24
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Exactly. Max timing on a bone-stock L36 can be achieved without KR on 87 octane.
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