Subject	Don't forget altitude
Posted by	xtensive on December 30, 2003 at 12:50 PM
	This message has been viewed 23 times.
In Reply To	It is based on the assumption of the type of octane posted by MikeH(Twin GT35BB Incon Z) on December 30, 2003 at 12:02 PM
Message	Altitude plays a big part in things too. We only get 91 octane in CO but can run a bit more timing on 91 octane because our air has less oxygen. Mike
Follow Ups	Serious question about the 4 ECU tuning thread. - Stealth021 11:36:56 12/30/03 I would never recommend or try to run 17 psi on 91 octane - Chip(GMS Racing) 11:49:13 12/30/03 To give you a better idea, ask the Cali guys how much can - Chip(GMS Racing) 11:51:47 12/30/03 More like 13 PSI. Calif went from 92 to 91 in early 2002 :-( (n/m) - Got Z? 12:06:42 12/30/03 Wow, even worse than I thought. (n/m) - Chip(GMS Racing) 12:14:40 12/30/03 That's at 72 deg F ambient. Worse on hot days. - Got Z? 23:23:00 12/30/03 I feel better about my very conservative 91 octane program. - Chip(GMS Racing) 10:56:20 12/31/03 I have three semi melted pistons from running 18 psi - MikeH(Twin GT35BB Incon Z) 14:25:10 12/30/03 Agreed. (n/m) - Chip(GMS Racing) 14:35:12 12/30/03 I ran 17psi all day long, no probs on 91octane, but - JayTTZ 15:12:06 12/30/03 It is based on the assumption of the type of octane - MikeH(Twin GT35BB Incon Z) 12:02:01 12/30/03 Don't forget altitude - xtensive 12:50:10 12/30/03 People will answer here for you, but you SHOULD read that - SeedyROM (ZCON 2K4!) 13:12:19 12/30/03 I hope Devin gets a chance to chime in too. (n/m) - MatD 13:15:37 12/30/03 Personally, I read every response. - Stealth021 13:31:01 12/30/03 Here's some food for thought too >>> - AshsZ(In Florida) 16:38:51 12/30/03 It seems from my reading that tuning for a/f is - MikeH(Twin GT35BB Incon Z) 16:58:56 12/30/03 Yeah, my ears... They're priceless to me. =) - AshsZ(In Florida) 17:35:56 12/30/03 interesting test...sounds familiar. - Spee 21:13:06 12/30/03 You win. - Stealth021 11:56:44 12/31/03 That's sarcasm I'd hope. (n/m) - SeedyROM (ZCON 2K4!) 12:26:28 12/31/03 50/50. =) - Stealth021 13:51:23 12/31/03 Hope to answer your question here: - AshsZ(In Florida) 14:08:00 12/30/03 I agree about retarding the timing - Chip(GMS Racing) 14:16:31 12/30/03 Is it possible to for pistons to begin melting without - MikeH(Twin GT35BB Incon Z) 14:26:57 12/30/03 At what boost and fuel do you run 22-23 degrees? What about - MikeH(Twin GT35BB Incon Z) 15:00:39 12/30/03 I run 20-22 at 1.3 Bar daily on 2530s on 93 octane - xybertron 15:08:31 12/30/03 Yeh I'm spiking at 17.5PSI on Devin chip on 92 octane in WA - StormShadow 14:23:20 12/30/03 "My mom can be a tuner too" (n/m) - AshsZ(In Florida) 18:44:19 12/30/03 So, gurus: if you all can tune a car, - dlinn 00:50:46 12/31/03
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