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Thread: Help with vehicle staying running and cold starts without throttle aid...

  1. #101
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    Quote Originally Posted by statesman View Post
    The low octane timing table isn't referenced during idle conditions.

    Here's a new tune with a slightly lower base spark... Do a RAFIG/RAFPN with this new tune and then do a driving log in closed loop with the A/C on... logging with the old pid list, which has the short and long term fuel trims.
    Here is my newest update to tune with rafig/rafpn done, etc:

    OL4_33WOTSpark_Mod5.ctz

    And logs for rafig/rafpn at full operating temperature after an hour or so:

    Park
    LS1B_0684.efi
    Drive
    LS1B_0685.efi

    Basically a difference of 7.5 g/s according to rafig and maf showing 10.43 g/s
    and 7 g/s according to rafpn and maf showing 9.5 g/s

    So a good bit off.

  2. #102
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    Okay, the slope of your IAC effective area table isn't right for your new throttle body... that's why the amount of error is different between park and drive. We can't just 'shift' the table like most people do... we're going to have to re-calibrate that table to suit the airflow characteristics of your IAC passage. This new tune has a slightly different IAC table slope. It's just a starting point, and we'll make adjustments from there. I'll need logs from your entire rafig/rafpn process... cold to hot. Make sure you include IAC counts in the logs.
    Attached Files Attached Files

  3. #103
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    I could be reading things wrong, but I think you nailed it on the first try.

    Here is my most recent tune with rafig/rafpn done from cold and then hot:

    Mod6OL_33WOTSpark.ctz

    And here are the log files that got me there from your last tune:

    CoolRafpn.efi
    ColdRafig.efi
    HotRafig.efi
    HotRafpn.efi

    Other than having the colder desired airflows since its summer and all of course.

    Looks like the average MAF reading and desired airflow from rafig/rafpn are almost exact.

  4. #104
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    Yeah, it's fairly close when hot but doesn't line up all that well when cold. Here's an adjustment that should get it to line up a bit better. Redo your rafig/rafpn and post the logs again.
    Attached Files Attached Files

  5. #105

  6. #106
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    Did you redo your MAF and VE before or after you did the rafig/rafpn?

  7. #107
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    Quote Originally Posted by statesman View Post
    Did you redo your MAF and VE before or after you did the rafig/rafpn?
    Did rafig before ve/maf change.

  8. #108
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    Okay, it appears that rafig is underestimating your engine's air needs... this sometimes happens with cammed engines but I don't know why. With this new tune don't do any rafig or ve adjustments... just flash and drive. I'd like you to do a log with the a/c on... and log these pids;

    SAE.TP
    SAE.VSS
    SAE.ECT
    SAE.IAT
    SAE.MAP
    SAE.MAF
    SAE.SPARKADV
    GM.IAC
    GM.IACDES_B
    GM.IBPW1
    Attached Files Attached Files

  9. #109
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    Quote Originally Posted by statesman View Post
    Okay, it appears that rafig is underestimating your engine's air needs... this sometimes happens with cammed engines but I don't know why. With this new tune don't do any rafig or ve adjustments... just flash and drive. I'd like you to do a log with the a/c on... and log these pids;

    SAE.TP
    SAE.VSS
    SAE.ECT
    SAE.IAT
    SAE.MAP
    SAE.MAF
    SAE.SPARKADV
    GM.IAC
    GM.IACDES_B
    GM.IBPW1
    Here is the log you asked for:

    LS1B_0708.efi

  10. #110
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    Okay, I'm going to lean out your idle a bit and a couple of small adjustments to your air. I'd like you to log the same pids as your last log.
    Attached Files Attached Files

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