Subject	Short answer: when your engine is detonating with the
Posted by	LitlElvis on August 04, 2009 at 3:14 PM
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In Reply To	when is race gas needed? posted by ricky6991 on August 04, 2009 at 02:19 PM
Message	current gas it's running - if no detonation, then running higher octane is a huge waste of money. It's pretty useless to generalize about a direct relationship of octane requirement to boost pressure only. The reason being is that no engine is the same with all the turbo/cam/piston/injector/intercooler/exhaust/ecu tuning/gear ratio combinations that are currently possible, one engine might get away with 25psi on pump premium while the another may only get to 15psi. Even similar combinations can have different octane needs based upon how the driver "drives".
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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