01-30-2010, 10:38 AM
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#18 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Greenville NC
Posts: 2,883
Drives: 370Z Sport
Rep Power: 978
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Quote:
Originally Posted by Zaggeron
unless you change your compression ratio you won't realize any advantages to higher octanes. Remember octane is not a measurement of energy potential -- it measures a fuel's resistance to premature detonation. Higher octanes mean you can safely compress the gas further. But you can't take advantage of that just by filling up with higher octane
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Well.......That's not entirely true. With today's adaptive ECU's, the knock sensor will allow the advance of timing up to the point of detonation then back off slightly for maximum power and efficiencies. Higher octane allows more timing to be advanced with a result in slightly more performance. Cooler Intake temps also allow this advance. I've posted numerous charts and graphs on this in the past so I'll spare you that. The 370 ECU has proven to be very adaptive which is one reason it responds so well to mods without re-tuning and will respond to higher octanes as well, at least up to the max adjustment range within the ECU programming. . As an example from the Audi camp, the difference between a 93 octane program and a 100 octane program on a 1.8T motor is roughly 15-20 hp. The differences between the programs are are primarily timing advances...
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Last edited by Modshack; 01-30-2010 at 10:46 AM.
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