Subject	I was under the impression it was just a slower burn
Posted by	CaliguyPurdue (Selin Design) on August 04, 2009 at 5:12 PM
	This message has been viewed 86 times.
In Reply To	There IS definitely a downside to higher octane posted by BobbyT on August 04, 2009 at 03:52 PM
Message	lower octane fuel being less stable burns quicker resulting is a more complete burn during the limited duration of the powerstroke. A faster burn has the same benefit of advancing the timing without the losses associated with starting the burn deeper/earlier into the compression stroke. I've heard the term "over-octaned" used to refer to this issue And as a matter of observation my DD Altima always seems to love 85 octane over 87 when I get a chance to use it. (N/A KA24) www.selindesign.net
Follow Ups	when is race gas needed? - ricky6991 14:19:02 08/04/09 what octane do you normally run? (n/m) - blackomega 14:37:26 08/04/09 I have a ash tune for 91 but i run 93 all the time. (n/m) - ricky6991 14:40:57 08/04/09 sorry not a tune i have just the basic basemap chip from ash (n/m) - ricky6991 14:41:35 08/04/09 I dont know if it is ever "needed". - blackomega 14:55:03 08/04/09 You're right about one thing.. "talking out of my ass" - SlicktopTT 15:11:30 08/04/09 haha - blackomega 15:34:02 08/04/09 Just please be careful with advice. Couple of things would - SlicktopTT 15:49:26 08/04/09 I agree - blackomega 14:26:07 08/05/09 Sounds like you need a tune first of all - dream Z (MD) 15:00:13 08/04/09 116 would kill your power? definatly not true. - zxtuner161 15:04:21 08/04/09 There IS definitely a downside to higher octane - BobbyT 15:52:27 08/04/09 your right that is true, i've never not turned up the boost - zxtuner161 16:02:46 08/04/09 I was under the impression it was just a slower burn - CaliguyPurdue (Selin Design) 17:12:16 08/04/09 Not just a slower burn, but also higher activation energy - BobbyT 21:00:06 08/04/09 not really - aliaZ 22:57:37 08/04/09 Avgas "cheats"--exception that proves the rule - BobbyT 00:26:28 08/05/09 exception that proves what rule? - aliaZ 08:25:42 08/05/09 They're inversely proportional - BobbyT 21:05:08 08/06/09 Bob, we're talking about gasoline here - aliaZ 22:51:53 08/06/09 Please stop... (n/m) - dream Z (MD) 21:25:43 08/04/09 my sincerest apology =] - zxtuner161 00:10:41 08/05/09 yes, i deff need a tune. - ricky6991 15:46:45 08/04/09 putting race gas in your car makes zero difference how the - zxtuner161 15:01:18 08/04/09 ill just stick to normal 93 octane then - ricky6991 15:53:16 08/04/09 Short answer: when your engine is detonating with the - LitlElvis 15:14:06 08/04/09 From Wikipedia - MITTZX 15:42:28 08/05/09
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