Subject	It is a built-in safety margin. If you're using a tailpipe
Posted by	Guapo on November 21, 2007 at 2:11 PM
	This message has been viewed 149 times.
In Reply To	where does the 11:1 A/F ratio rule of thumb come from? posted by ZEngineer on November 21, 2007 at 01:56 PM
Message	sniffer, you're losing a lot of accuracy between the combustion chamber and the tailpipe. Also, a dyno will not produce an equal load as a moving car will. And, you need to tune for worse case scenario. If you get a bad batch of gas, you certainly don't want to be running on a 13:1 tune. Then there are weather factors to take into account. It's just a built in safety measure. If you can get more accurate readings and guarantee good gas at all times in controlled weather, then you can up the ratio. Petz #2 "What's the point of having the car if you don't drive it?" - Mrs. Guapo 08/20/05 Jeeeesus Christ - my Dad (after a ride in my Z) 12/26/04 People have the right to freedom of expression. However, people also have the right to point and laugh- aliaZ 04/06/06
Follow Ups	where does the 11:1 A/F ratio rule of thumb come from? - ZEngineer 13:56:49 11/21/07 I don't know the answer to this - awesom-o 14:06:00 11/21/07 It is a built-in safety margin. If you're using a tailpipe - Guapo 14:11:40 11/21/07 understood, thanks. Just a little FYI - ZEngineer 14:18:12 11/21/07 Follow up question - - awesom-o 14:21:19 11/21/07 Guapo's message sums it up nicely - ZEngineer 14:30:38 11/21/07 Odd that you'd have to correct so much. BTW, usually - Guapo 14:34:40 11/21/07 a possible explanation might be - ZEngineer 14:40:05 11/21/07 Hey George, what dual pop intake do you have? - Ash's Z 16:00:31 11/21/07 That's impossible. Our intake doesn't have an imbalance. - ni[X]it 16:58:54 11/21/07 :) (n/m) - Ash's Z 21:43:29 11/21/07 I'm using the JWT replica elbows that used to be available - ZEngineer 17:03:23 11/21/07 I put together a post which made it to FAQ called "The - Ash's Z 21:45:19 11/21/07 duly noted, I'll have to find some sort of hand-held pump - ZEngineer 21:48:29 11/21/07 the accuracy is still bad... - ni[X]it 16:42:45 11/21/07 all the more reason to get a wideband in soon :) (n/m) - ZEngineer 17:04:21 11/21/07 contact me for all the Innovate stuff (n/m) - Seb (specialty-Z) 20:58:16 11/21/07 will do, but I have a little more homework to do - ZEngineer 21:17:58 11/21/07 give us a call for any technical questions - Seb (specialty-Z) 01:13:44 11/22/07 When converting from metric to US units that is 11.5:1.... - RSR 14:21:32 11/21/07 Mostly to do with combustion temperatures. If you try - Ash's Z 15:14:40 11/21/07 Exactly, it's primarily for cooling. - ZCulture 10:09:20 11/22/07 Google says ... - NytWolf 15:22:32 11/21/07 11.5 is safe, nothing over 12 if you run big turbo/boost - timz 15:23:03 11/21/07 "I've never heard her ping" - AZHeat 15:53:31 11/21/07 where are you getting 11.6 from? (n/m) - Devi13 20:38:40 11/21/07 wideband reading (n/m) - AZHeat 00:23:45 11/22/07 yeah on what octane? - Seb (specialty-Z) 20:59:15 11/21/07 Re: yeah on what octane? - AZHeat 00:23:20 11/22/07 Re: Re: yeah on what octane? - Seb (specialty-Z) 01:12:47 11/22/07 I'm running 19psi on sport 500 with 91 octane for over 1yr. - Devi13 02:52:21 11/22/07 I know what pinging sounds like. I have heard pinging - AZHeat 09:19:28 11/22/07 .. - jas0n3485 10:03:09 11/22/07 check primary timing map - Devi13 13:46:48 11/22/07 sounds like you've got your timing maps - Seb (specialty-Z) 16:33:21 11/22/07 Re: I'm running 19psi on sport 500 with 91 octane for over 1 - Seb (specialty-Z) 16:32:28 11/22/07 Actually its very advanced. - Devi13 03:07:52 11/23/07 Re: Actually its very advanced. - Seb (specialty-Z) 13:48:17 11/23/07 intercooler setup - Devi13 14:22:24 11/23/07
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