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  1. #1
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    Alex Rauld
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    Default 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

  2. #2
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    Default

    Quote Originally Posted by myltwon View Post
    What's the ideal target AFR for idle on a car with a decent amount of overlap?
    Need more info

    Sent from my VS996 using Tapatalk

  3. #3
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    Default

    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

  4. #4

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    "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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    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

  6. #6

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    Quote Originally Posted by myltwon View Post
    So at operating temp I would want leaner than stoich, but at cold start up target stoich?
    stoich is 14.7, you really want it a little richer especially in cold weather.

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