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VE tune changed drastically when MAF re-enabled?

This is a discussion on VE tune changed drastically when MAF re-enabled? within the Computer & Tuning forums, part of the LSx Technical Help Section category; Nevermind.... Got VE right on the button (LTFT's = 0-3, just can't seem to get MAF to come around to ...

  1. #1
    TunedByFrost supporter rel3rd's Avatar
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    Question VE tune changed drastically when MAF re-enabled?

    Nevermind....

    Got VE right on the button (LTFT's = 0-3, just can't seem to get MAF to come around to where it's supposed to be...or even close.

    If anyone has any tips or secrets to getting MAF dialed in, I'm all ears
    Last edited by rel3rd; 03-13-2009 at 06:08 PM.
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    Veteran 0rion's Avatar
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    are you using the maf error histogram? copy and paste mult by half?

  3. #3
    TunedByFrost supporter rel3rd's Avatar
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    Quote Originally Posted by 0rion View Post
    are you using the maf error histogram? copy and paste mult by half?
    Not sure? I was using this:
    http://www.hptuners.com/forum/attach...0&d=1228098301

    I was copy/paste special multiplying %, but not by half.

    LTFT's with MAF enabled are anywhere from +8% to +18%

    Truck actually was idling low, and dead spots just off idle, and running like crap after the third reflash, so as I got more aggravated I decided to reflash back to OLSD, where it runs fine, and try again tomorrow on the MAF tweaking.

  4. #4
    TunedbyFrost.com Tuner Frost's Avatar
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    goto

    engine>airflow>dynamic airflow and set High RPM Disable to 1200.

    This will curtail VE blending and put you 'on the MAF' totally by 1200 RPMs to allow you to really nail down the error.

  5. #5
    TunedByFrost supporter rel3rd's Avatar
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    Thumbs up

    Quote Originally Posted by Frost View Post
    goto

    engine>airflow>dynamic airflow and set High RPM Disable to 1200.

    This will curtail VE blending and put you 'on the MAF' totally by 1200 RPMs to allow you to really nail down the error.
    As always, thanks for the tips/advice Frost.

    As per our conversation, I lowered that setting to 0 and it took only 2 tries to hit it pretty much dead on. One "special - multiply % and one multiply by 1/2" fixed her up. On drive home log, I had most MAF Hz cells with several hundred hits, so I had good info to go with. All LTFT's are now 2 or less, except one measly straggler cell at 3, lol.

    Funny thing:
    After I talked to you I realized that I spent all morning "tuning" a MAF that I still had disabled from last night....DOH!!!!! No wonder I was datalogging all morning and no changes seemed to make any difference, LMAO.

    Thanks again!

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