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Thread: Rich idle fic 1200's

  1. #1
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    Default Rich idle fic 1200's

    So I have a p59 3bar sd twin 61mm vs turbos. SS2 cam.The issue is as stated above. I have all injector data put in from FICs site I have tried changing the ve and commanded fuel vs rpm table but afrs are still 12.1-12.5 at idle. I am running 43.5 fuel pressure. Timing is right around 20⁰ at 800rpm. Am I asking too much of these injectors? I also noticed that inj_ms is staying around 2.13ms no matter what I change also.
    I originally thought it might be going into engine protection mode or something like that the way just sticks right in the 12s at idle. Intial start up(first .5 -2secs or so) it's right around 14.1 then slowly gets richer as the idle drops down to around 800. Any help would be great I have ran this car on basically the same ve table when in a maf based tune and it was great. This was the first startup/idle tuning I have done on it.
    Last edited by dmaxguy2008; May 18th, 2020 at 05:10 AM.

  2. #2
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    Default

    Bump

  3. #3
    Joe (Moderator) joecar's Avatar
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    How did you scale the injector data for 3 bar (43.5 psi) rail pressure...?

    Did you enter in all the injector characterization data...?

  4. #4
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    Yes joe all info is in there I actually tried dropping fuel pressure to around 35psi. Unfortunately I overlooked a very important detail called injector dutycyle. Turns out (well as far as i know) you cant command less than 1% DC. Maybe I'm wrong and please correct me if that's the case. But i believe these injectors are just to big to lean the idle out anymore.

  5. #5
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    My guess on the way afrs go from 14.1 in the first couple of seconds of start up to 12.5ish are maybe something to do with cranking airflow tables or some sort transient that I cant figure out.

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