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Thread: E38 idle tuning

  1. #241
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    Ok so I have been working on this process for a few days now and I think I am starting to get this beast of a car to play nice. I have a 417ci LS3 with a supercharger and supporting mods. My AFR at idle is 14.
    5-14.8 my, VVE and MAF are both done just working out this blasted idle. Currently I am running 15*, 11 g/s in B1829, 1.7 B1651/B1652 and with a commanded 900rpm idle it idles rather nice in gear or park. Put it in Reverse or any forward gear and the ETC jumps from 17/18 to 23/24 and the timing drops into the negatives like it's trying to compensate for the increased air flow from the change in throttle angle. If I drop B1652 to 1.5 this condition is much better but not great. One last detail is that the g/s in my data log is 18 at idle and 23+ in gear. So is B1651 in park and B1652 in gear or are the blended to reach a sum total? Am I going about this the correct way or is my logic flawed?

    W~


    Log_1588.efiNew base_0010 VE_0023.tun

  2. #242
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    Here is one that has been keeping me up at night!!

    I am commanding 11 g/s in B1829 and I can take B1651/B1652 from 1.7 to 2.5 and I get the same idle at 1000 rpm and I'm logging 20 g/s in my data log. Where is the extra 9 g/s coming from? I have more then enough head room in B1651/B1652 to let it run on B1829 but its not?

    W~

  3. #243
    Joe (Moderator) joecar's Avatar
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    I'm looking thru your files, but I can't see what is causing the 9 g/s difference.

  4. #244
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    Just reading through a few old posts in here and found this one I posted:
    "Next problem....."Fixing" a poor idle issue on a big cammed VE for a customer.Os: 12612381 Calib: 12612380
    An early Model VE Holden.
    The main culprit is that the biggest ECT TP it will command is 12.7% and thats it even with B1652 at 6 which maxes it out. This is in open loop idle tuning with Min idle airflow maxed out to 63g/s and intergral/proportional set to "0"
    The VE 2012 model I've just finished tuning allows 18.8% with B1652 set to only "3" making cold starts a dream cos you CAN open the throttle further to get the airflow you need.
    Surely there is a setting that can be made available that sets maximum throttle blade angle in idle mode. In earily calibrations this may be set much lower. I've followed exactly the same approach as I always have in setting up the idle."

    Ross did you ever get a chance to have a look at this?> it would save all the "hole drilling" you have to do on the older VE Holdens?

    thanks,
    Mike
    "Just a tune > yeah right !!!! "

  5. #245
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    JeffFinal_Idle5-8.8_max1.45_12.8min_0000-best only ac startup die.ctzHipowerlogidle.efi Can anyone help me out and peek and my logs and cal? Im running a cammed ls3 232/238 111 LSA. First time idle tuning. So far I got the idle stabilized. Although, sometimes start-up with the A/C will cause it to die. Also, timing isnt where i want it to be. Its adding a little bit more than i commanded. My goal is to get a steady lope.

  6. #246
    Senior Member Naf's Avatar
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    Quote Originally Posted by HiPower View Post
    JeffFinal_Idle5-8.8_max1.45_12.8min_0000-best only ac startup die.ctzHipowerlogidle.efi Can anyone help me out and peek and my logs and cal? Im running a cammed ls3 232/238 111 LSA. First time idle tuning. So far I got the idle stabilized. Although, sometimes start-up with the A/C will cause it to die. Also, timing isnt where i want it to be. Its adding a little bit more than i commanded. My goal is to get a steady lope.
    May i have a *.tun file. Its when you save your tune on your laptop not device...
    American Muscle, European Design, Japanese Tactics

  7. #247
    Senior Member Naf's Avatar
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    Ok, this is what i found,

    Return B1845 and 1843 back to stock, then try it with this tune...

    I bumped up your idle timing slightly as well are you min air flow

    I have a 229/242 with a 114 lsa and found when a cam is that big it likes more timing and air flow.
    American Muscle, European Design, Japanese Tactics

  8. #248
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    Default Joel and Simon

    I have gone through the tutorial and have made great progress, but i cannot seem to get it perfect. Are you still looking at tunes and helping to diagnose? I'm not sure how to PM within this forum, so I am making this post. Thanks in advance!

  9. #249
    Joe (Moderator) joecar's Avatar
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    ( you need to make at least 10 posts before you can send a pm... also make sure you enable Receiving PM's in your settings ).

  10. #250
    Lifetime Member hymey's Avatar
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    I apologise for not being on here of late have had some health issues. My new email address is princeperformance@live.com.au . I check emails daily .

    Kind Regards

    Hymey

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