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Thread: E38 idle tuning

  1. #291
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    Ok I will try that.

    What impact does and B1652 have?

  2. #292
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    I'm on my phone but B1652 should be max idle air for drive conditions. It's the hard limit the blade can open in effective area, regardless of min idle values. This could help with the flair if you close the cap between min idle air values and max area.
    00 Silverado Z71, LQ9 w/ LS3 heads, BTR cam, Whipple 2.9@8#, 4l80E

  3. #293
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    Does efilive have 'minimum idle rpm vs vehicle speed'? I see TC has it but how important is it for idle tuning?

  4. #294
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    I'd like to thank all the real tuners on this thread who've contributed such great info. It was very helpful in making a noticeable improvement in the idle quality of the LS7 in my '12 Z06.

    Thank you all.
    Hib Halverson
    just another f'ing "Tuner In Training"

  5. #295
    Joe (Moderator) joecar's Avatar
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    Hi Hib, hope you're doing well, good to hear your car runs well.

  6. #296
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    Quote Originally Posted by joecar View Post
    Hi Hib, hope you're doing well, good to hear your car runs well.
    From a calibration standpoint, I've got the idle and part throttle driveability much better then when I picked-the car up after the engine work.

    The engine has a terrible oil consumption problem, however, and I'm having a dialog about the problem via email with Katech, the guys who built the motor.
    Hib Halverson
    just another f'ing "Tuner In Training"

  7. #297
    Joe (Moderator) joecar's Avatar
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    Let us know how it goes.

  8. #298
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    Thanks Joel (Hymey), Swingtan, Ringram and other contributors to this thread
    I am just finishing off an 06 Z06 with 239/251 @ 0.050 on a 111.5LS cam, FAST intake, Headers, cat delete and exhaust with factory mufflers.
    The car made 570hp/510ftlbs at the tire, pretty stout
    I have done a bunch of E38's but this one had me challenged on the idle and startup. Going through this has it nearly sorted.
    I haven't drilled the blade or modified B1650 yet.
    It idles great, steady at 850RPM and likely would idle lower.
    The only challenges I have at this point are a bit too long crank at hot start (haven't modified B1602 so am going to kick it up a bit) and the car surges at part throttle below about 220.
    For the surge is the B5122 Coast Down Spark the most likely culprit or should I be looking elsewhere.
    Thanks
    Eldon

  9. #299
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    06_Z06_1Dec2018_0007.efi
    06_Z06_1Dec2018_0008.efi
    2006_Z06_12605731_1Dec2018.ctz
    The car works amazingly on the road course however the surging below 2000 RPM is irritating. When it is surging the throttle blade and the timing can be seen to move in the logs but I am chasing my tail what is driving it. Cal and logs attached. Any thoughts.

  10. #300
    Joe (Moderator) joecar's Avatar
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    Hmmm, might be spark advance related.

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