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Thread: lq4 Tune help

  1. #21
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Prormk163 View Post
    Sounds good! I probably won't get a log in until Thursday, it's supposed to be cool here in northern Mn again and rain.
    Should I have done calc.Vet prior to AutoVe? If so I have not done so.
    If you're street tuning, do Calc.VET, and check your results.


    ( the names of the methods have been chosen to confuse the heck out of every one )

    Be sure to read post #29 here: Summary-Notes

    . . .
    Calc.MAFT:
    - same as AutoVE (corrects VE) but also simultaneously calculates MAF (from corrected VE),
    - can be done with or without CL/LTFT (edit calc_pids.txt to use the appropriate BEN pid),
    - create a map for CALC.MAFT and directly paste this into B5001.

    Calc.VET:
    - same as AutoMAF (corrects MAF) but also simultaneously calculates VE (from corrected MAF),
    - can be done with or without CL/LTFT (edit calc_pids.txt to use the appropriate BEN pid),
    - create a map for CALC.VET and directly paste this into B0101.
    . . .

  2. #22
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    I am street tuning, and was planning on running a maf as the temps here vary so much. I've read pros and cons to both, if I plan to run a maf should I still do calc.vet? Or should I do calc.maf?
    Last edited by Prormk163; April 25th, 2016 at 10:47 AM.

  3. #23
    Joe (Moderator) joecar's Avatar
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    The simplest is to do Calc.VET... see how this goes...

    it will go good if injector data is good, and if MAF/filter combination like each other (no plumbing bends immediately before/after MAF (MAF screen helps), filter baffled from engine heat and fan draft)...


    post picture of your engine bay.

  4. #24
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    Alrighty I will do that! Did I harm anything by doing Auto.Ve first? I wouldn't imagine so since I enriched the table prior to starting the process.

  5. #25
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    No harm in doing either. I just prefer calcvet or calcmaft because it fixes everything in one go.

    Sent from my LG-LS980 using Tapatalk

  6. #26
    Joe (Moderator) joecar's Avatar
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    Should be ok.

  7. #27
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  8. #28
    Joe (Moderator) joecar's Avatar
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    MAF may be too close to filter.

    Filter is not shielded from air movement from fan(s).

  9. #29
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    I do have a shield for it. As far as the maf location, how far should it be from the filter? It must get inaccurate readings because it can't average properly due to turbulence and currents?

  10. #30
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    At least 6"from filters or bends. In your case, right in the middle of that inlet pipe.

    6"gets you near - uniform flow. Turbulent flows are , as you know, random and will remove temperature from the mafs hot wire also randomly-leading to a fluctuating g/s reading in steady state operation.

    Calcvet will still work for the ve table part , but the maf part will be goofy til you fix it.
    Sent from my LG-LS980 using Tapatalk
    Last edited by Jetmech442; April 26th, 2016 at 12:58 PM.

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