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Thread: E38 idle tuning

  1. #311
    Joe (Moderator) joecar's Avatar
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    I got home late... thanks hymey and LastCall for your replies, I appreciate you help

  2. #312
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    This is a customer's car, right?

  3. #313
    Senior Member auspeed's Avatar
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    With the later OS, the hard limit in the tune for idle has been increased from 60 to 200.
    By hard limit you mean the throttle can be pushed open further for idle via the corresponding parameters?
    Last edited by auspeed; December 5th, 2018 at 03:33 PM.

  4. #314
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    Thanks Hymey and Lastcall for the input.
    Thought I would update.
    I tried your cal Lastcall and the surging got worse. It did pull the timing down nicely. Amazed me as I thought you were onto something.
    So I logged all the EST pids and found that it is Torque Reduction Spark Retard that is pulling the timing however I still don't see what is causing it. I even maxed BTM and Throttle Tip In on the odd chance.
    Kym_5Dec2018_0002.efi
    2006_Z06_12605731_5Dec2018_mod1_0003.ctz
    Kym_5Dec2018_0004.efi

  5. #315
    Joe (Moderator) joecar's Avatar
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    Try setting BTM Limit to min (i.e. most negative).

  6. #316
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    Thanks Joe
    Still surging

    I have spent a ton of time on this. Earlier today I reread this entire thread as well as any other info I could find and thought I had it and was just being a dummy and not remembering some of the steps in this thread. Or so I thought, I am at a loss.
    I finally eliminated the SEMRET by 0ing B2522 Torque Reduction Max. I am a bit concerned this will reduce the traction control any ideas?

    I ended up with redoing the Min Idle Air and Max Idle Air B1651 and B1652. I was thinking I had missed and that if I put B1651 real low like 0.7 or 0.6 it would stop the surging as it wouldn't allow it to go into idle mode. But this seems to also control the idle air max at idle in neutral.
    I have even gone so far as putting it into Open Loop with no short or long terms and setting the MAF to come in at 1000RPM.

    I am at a loss as to where to go from here.
    Any help would be greatly appreciated
    Attached Files Attached Files
    Last edited by TurboCamaro; December 28th, 2018 at 03:15 PM.

  7. #317
    Joe (Moderator) joecar's Avatar
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    Which V7 build version are you running...?

  8. #318
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    HI Joe
    V7.5.24
    Is there anyway to see/log the idle airflow like commanded air, actual air, Integral, Proportional, etc

  9. #319
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    How do you see so many frames in the log . I can only see like 100 frames when i log...how do you squish them?
    What idle speed should I shoot for on a stock cam?
    Reason I ask is the closer I get to 550rpm using B1652 to reduce idle speed the rougher is seems to idle.
    I zeroed 1845 and 1843
    63 g/s in b1829
    First start after idle trim reset ....runaway idle to 1000rpm
    Used 1852 to bring idle down started with 1.1 went down to .75 still 630rpm
    Ran best at .8 702rpm
    It's too much rpm tho I think 702 it's a stock cam...
    Should I zero 5130 my timing is fluctuating between 3and9 degrees...
    Should I command more base spark b1504

    How do I know if I need to add or subtract from 1652 if my spark advance is lower than what is commanded in b5104

    Or just change b 1821 to a higher rpm and hope that 5128 5129 5130 5131 don't disrupt timing while trying to dial the idle air mix in?

  10. #320
    Senior Member Naf's Avatar
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    If you are runnin a stock cam, why are you messing with the settings?

    Start from stock and massage it smoother. Idle 2 is when you are pressing on the brake, and idle 1 is when you idle in park. You will have to adjust the throttle follower to be just below your final airflow. it will cause the rpm to scream (B1604) lower this then adjust the min airflow, and if you are stockish, go for 600-750rpm at 18-22 deg of timing advance.

    For logging there is a setting you can adjust, go to edit, then properties,and click on the logging tab. Increase the frames there

    I have a moderate cam and i use most of the stock settings, just allowed it to breathe a little more and fluctuate a little less. My only problem is when i shift out of gear into park the rpm drops from 725rpm to 400 then fluctuates. Its a work in progress.
    American Muscle, European Design, Japanese Tactics

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