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Thread: Need a basic lesson on idle tune w/cam..

  1. #11
    Lifetime Member TAQuickness's Avatar
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    Quote Originally Posted by Doc
    Thank you TAQuickness. This is one of the primary reasons I went with EFI Live- this community is so helpful and understanding.
    lol - me too


  2. #12
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    I'm thinking the idle timing has to be raised alot.Probly 20-26degree's total.That would smooth out idle and affect startup.

  3. #13
    EFILive Reseller ringram's Avatar
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    Agreed, I found best kpa (ie highest vacuum) on stock engine with around 28deg at idle. Stock was around 20.
    Apparently "The goal with any idle setting is a "lean-best" setting - that is, the leanest possible ratio yeilds the maximum idle vacuum while maintaining the rpm set point." That from a ford tuning site. If you search for "lean best idle" you will see plenty of links.
    Basically you can use bidirectional controls to adjust timing to the best vacuum point. For me it was the difference of 35kpa to 30kpa. Instant consumption dropped 5-10% according to the onboard computer too.
    I also dropped my idle to 635 rpm.
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  4. #14
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    ahh I see now.. thanks!!
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  5. #15
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    Great information !

    edit: So, will increasing timing at idle help with big cam surge and/or stalling?
    Last edited by NOSjohn; March 29th, 2006 at 08:13 AM.
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  6. #16
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    The bi-di controls rock for smoothing out big cam idle. I played with mine for a while, updated the flash, and now my 238/240 .605/.609 112+2 cam purrs like a kitten at 900 RPM. It actually sounds smaller than the ever popular 224/224 cams with a "typical" tune.

  7. #17
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    Quote Originally Posted by TAQuickness
    The RAFIG is the sum of both the short and long term idle trims. RAFIG for in gear, RAFPN for park/neutral. In the map you want RAFxx as the data parameter, ECT for rows, and InGear or PN for column. In order for the RAFxx pid's to work, you will need to select the supporting idle trim parameters as well.

    As for IAC, you should target 65-100 steps for hot idle. I find closer to 100 works better for bigger cams. As for ETC, I don't know. Maybe an ETC guy will chime in
    TAQuickness, I set mine up and had a little problem.. in the column with "Ingear" what is the PID used for this?

    I have RAFIG for data and ETC for rows.
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  8. #18
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    Any ideas?
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  9. #19
    Lifetime Member Bruce Melton's Avatar
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    Default further help please----------

    I was following this thread trying to run a somtimes hot start stall on a 224 cam LS6. I think we need more idle air.

    When logging RAFIPN can someone show me the MAP setup?

    Have the PID loaded and supported but can't figure out, after an embarrasing number of hours how to display the RAFIPN data or MAP.

    Thanks,
    Bruce

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  10. #20
    Lifetime Member TAQuickness's Avatar
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    you will want to copy all the temperature values from B4307 as the rows in your map, and make the column heading Park/Neutral. Row and column parameter will be ECT, and your data parameter will be RAFPN. Be mindful of your units


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