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Thread: Ideal Target AFR @ Idle
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01-06-2019, 05:42 PM #1
Ideal Target AFR @ Idle
What's the ideal target AFR for idle on a car with a decent amount of overlap?
Last edited by myltwon; 01-06-2019 at 08:27 PM.
1994 Trans Am GT - HPS Ported Heads/Intake, LE Cam, FTI 3600, TP Built 4L60e, Moser 9" w/ 3.90's, BMR Suspension, Formato Tuned
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01-06-2019, 06:14 PM #2Lurker
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01-06-2019, 08:26 PM #3
what info do you need me to provide? mods in sig
1994 Trans Am GT - HPS Ported Heads/Intake, LE Cam, FTI 3600, TP Built 4L60e, Moser 9" w/ 3.90's, BMR Suspension, Formato Tuned
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01-09-2019, 04:05 PM #4
"Usually" the pcm is going to try and maintain stoich, at startup you usually want it a little rich like a choke on a carb, since there is no load on the engine at idle 14-15 is ok. but depending how much overlap you have may be more or less.
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01-10-2019, 07:12 AM #5
So at operating temp I would want leaner than stoich, but at cold start up target stoich?
1994 Trans Am GT - HPS Ported Heads/Intake, LE Cam, FTI 3600, TP Built 4L60e, Moser 9" w/ 3.90's, BMR Suspension, Formato Tuned
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01-10-2019, 09:09 PM #6
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