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Thread: Idle Tuning How-To & Guide (w/pictures)

  1. #41
    Senior Tuner Ben Charles's Avatar
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    Nate if you need help send me a PM, this guide is good only to get you started, still a lot to it that you have to know what to do.

    I do email tunes on here all the time.

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  2. #42
    can i adjust idle spark on the run using vcm controls just like idle speed?
    09 CTS-V A6

  3. #43
    i tried to adjust spark with vcm controls,, but the car almost stalled when i disabled adaptive spark,, why?
    and vcm only allowed me to reduce timing,, absolute and plus were inactive,, please advise,,
    Last edited by kj217; 04-30-2013 at 11:22 PM.

  4. #44
    Senior Tuner Ben Charles's Avatar
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    Kj what computer are you using

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  5. #45
    Quote Originally Posted by Ben Charles View Post
    Kj what computer are you using
    a pc with win7,,

  6. #46
    Senior Tuner Ben Charles's Avatar
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    Well not your actual PC, but the computer you have in your car. I take it that your a GEN 3 computer since your posting here and not a Gen 4??

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    96 TA Blown/Stroked, 4L80E/Fab 9
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  7. #47
    Quote Originally Posted by Ben Charles View Post
    Well not your actual PC, but the computer you have in your car. I take it that your a GEN 3 computer since your posting here and not a Gen 4??
    its an E67,, but am posting to this thread assuming its still applicable,,

  8. #48
    Senior Tuner Ben Charles's Avatar
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    Thats a Gen 4 computer, you should ONLY be able to minus spark. Becareful though b/c spark will only minus to whatever the higher of the idle or high octane spark.

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    96 TA Blown/Stroked, 4L80E/Fab 9
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    Custom Mid Engine chassis, AKA GalBen C

  9. #49
    Quote Originally Posted by Ben Charles View Post
    Thats a Gen 4 computer, you should ONLY be able to minus spark. Becareful though b/c spark will only minus to whatever the higher of the idle or high octane spark.
    i see,, but why it almost stalls if disabled adaptive spark?

  10. #50
    Senior Tuner Ben Charles's Avatar
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    IF you disable spark and it tries to die, airflow is wrong. You know the idle is right when you don't have to count on spark to make it idle correctly. To be honest fuel as the biggest impact on idle from what I have seen.

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    96 TA Blown/Stroked, 4L80E/Fab 9
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    Custom Mid Engine chassis, AKA GalBen C

  11. #51
    Quote Originally Posted by Ben Charles View Post
    IF you disable spark and it tries to die, airflow is wrong. You know the idle is right when you don't have to count on spark to make it idle correctly. To be honest fuel as the biggest impact on idle from what I have seen.
    should i take idle airflow up?
    09 CTS-V A6

  12. #52
    Senior Tuner Ben Charles's Avatar
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    Give it a shot

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  13. #53
    Quote Originally Posted by Ben Charles View Post
    Give it a shot
    what if MAF idles @ 3450Hz?
    09 CTS-V A6

  14. #54
    Senior Tuner Ben Charles's Avatar
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    That's fine depending on how big the tube is. Since it idles that high you probably have a round a 3.25inch tube with a 85mm style maf

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    96 TA Blown/Stroked, 4L80E/Fab 9
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  15. #55
    Quote Originally Posted by Ben Charles View Post
    That's fine depending on how big the tube is. Since it idles that high you probably have a round a 3.25inch tube with a 85mm style maf
    its actually a 4" pipe with 100mm MAF,,
    09 CTS-V A6

  16. #56
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    I used this idle tuning guide before,works great. Thank You!!!!
    But last week,I was working on a LS1 T/A with a mild 222/226 cam,and it did not worked at all.
    Once the VE and MAF were dialed in.
    I had to add 40-50% of base running airflow for it to idle correctly.I got it 90-95% OK,but not 100% perfect.
    Couldn't figure out why it needed the extra airflow for it to idle.
    But I noticed that their was a hole that was drilled in the TB about 1/4 inch or a bit bigger. I'm guessing this is the issue.
    Any suggestions to fix it 100% ? Or just keep guessing the base running airflow?
    The way it is now,when I log the idle adapt (STIT) sometimes it's as much as -50's, and example,the idle desired airflow is 1.2 and I have to set the base running airflow to 1.5-1.7 for it to idle.
    Thanks in advance.

    Edit:I also tried to add 4-5% of fuel on the VE table and MAF at idle.Redid the idle tuning,the base running airflow and the desired airflow matched perfect and it idled perfect.So I was wondering if I should fix it this way?
    Last edited by Motion427; 05-05-2013 at 07:32 PM.

  17. #57
    Senior Tuner Ben Charles's Avatar
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    Sometimes Idle desired is NOT what the engine really wants, its just a calculation. IF a hole in the TB is too big or the throttle plate is open too far you'll get a really low idle desired. If Idle trims are swinging that much I would say fuel is way off and possibly timing. Also remember Idle desired will always follow IAC.

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    96 TA Blown/Stroked, 4L80E/Fab 9
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  18. #58
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    Thanks for the reply.
    Idle timing is set at 24 degrees.
    The VE table is 0 to -2 accross the board and I adjusted the MAF to match the VE.
    Unless theirs an issue with the MAF at idle.
    Because at first,I had tuned the car from idle to 4000RPM in SD only,everything was great including the idle,but when I reenable the MAF, that's when I started to have idle issues.The MAF was off a bit, so I thought I' d adjust the MAF to think,it would cure it.But it did not.So I took the intake out and that's when I notice the drilled TB.

    The customer is very happy with his car,it run's 10 times better than before.Don't know if the previous tuner had a bad sensor or something but it didn't idle at all and was pig rich everywhere.
    But I know that's theirs an idle issue and I would like to fix it 100% and not 90% or less.I can get the car back,recheck the VE,etc... to see if I did an error somewhere.

    One thing,I haven't check if the TB got re-adjusted,The IAC were around 180-200 on a cold start (coolant temps at 40F). And 60-80 range at 190F.
    Last edited by Motion427; 05-06-2013 at 05:42 AM.

  19. #59
    Quote Originally Posted by Motion427 View Post
    Thanks for the reply.
    Idle timing is set at 24 degrees.
    The VE table is 0 to -2 accross the board and I adjusted the MAF to match the VE.
    Unless theirs an issue with the MAF at idle.
    Because at first,I had tuned the car from idle to 4000RPM in SD only,everything was great including the idle,but when I reenable the MAF, that's when I started to have idle issues.The MAF was off a bit, so I thought I' d adjust the MAF to think,it would cure it.But it did not.So I took the intake out and that's when I notice the drilled TB.
    i was under the impression that MAF will not kick in anywhere before 4k rpm,, or you enabled it for the entire rpm?
    09 CTS-V A6

  20. #60
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    I thought maybe if I would post the tune it.somebody might notice something.
    Sorry,I don't have a log at this time.
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