Subject	Here's some food for thought too >>>
Posted by	AshsZ(In Florida) on December 30, 2003 at 4:38 PM
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In Reply To	Personally, I read every response. posted by Stealth021 on December 30, 2003 at 01:31 PM
Message	This morning on my 20 mile trip to work across I20 I had a mission. Even though I already knew what to expect, for the off chance that I had simply been dreaming all my life and had only convinced myself that I was right, but in fact was wrong, I put it to the acid test. I was cruising at 80MPH, but in 5th gear the RPM was too low to make appreciable boost; I was going to intentionally make it ping. So I dropped into 4th gear and opened the timing/fuel control page of my ConZult and advanced the timing to +5 degrees.. This would make my car run 26 degrees of timing advance under full load on pump fuel. As I was laying into the throttle, I began applying brake until I was WOT and maintaining speed. AT about 16psi or so, it began pinging but boost continued to rise to 19 (where it is peaking) and I stayed in it. It continued to ping very aggressively and I began decreasing ignition timing back until I heard the pinging stop. The moment it stopped I looked at the screen and it was at -2, which would mean it was running 19 degrees of timing advance at the point it stopped pinging. I continued pulling like this, waiting for the poof, but I knew it would not happen. And I repeated this process once again before exiting the interstate. So it appears that when it begins pinging, cylinder components do get hotter and in order to stop detonation, you will actually have to drop it lower than what it would normally be if it were not detonating previously. This is consistent with all points of my theory and my car is still running without any problems. *Now I would not suggest anyone with stock pistons go out and do this. You will break a stock piston quite easily doing this. I really wouldn't suggest anyone do this unless you dont care if you break parts, of which I really dont care if it proves a point. If anyone would like to come by here and I'll be more than happy to demonstrate this, but bring a video camera so we can record it - I dont want to start giving detonation tours to everyone, LOL. [ ashleypowers.com ] [ agpowers@bellsouth.net ] [ Zemulator Information Sheet ] [ Z1 Motorsports Website ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast?
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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