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Thread: Closed loop tuning histogram / maths

  1. #1
    Potential Tuner
    Join Date
    Jun 2014
    Location
    St. Joseph, Mi
    Posts
    6

    Closed loop tuning histogram / maths

    I'm wanting to tune the maf to get my ltft and stft as close to 1% as I can. I currently have a user maths that takes my ltft + stft and then I made a histogram using that maths with maf frequently. Will this work to get the maf scaling close. I know it's not perfect but I don't see why this wouldn't work.

  2. #2
    Potential Tuner
    Join Date
    Nov 2018
    Location
    Reno, NV
    Posts
    3
    You're close, but there's more to it to get accurate data, and it can depend on what car and mods you have, so it's helpful to post those.

    To start, you'll need to disable your VE table (Usually done by setting Dynamic Fueling to a very low RPM). Filtering for ETC > 150 will help too. Once the trims are close, disable LTFT by setting the learn enable to a high temp (~400) and finish using only STFT.
    It also depends on what injectors you have. If you have Siemens 60lb injectors or bigger, you'll likely need to filter for pulse widths greater than 1.2ms because inaccurate short pulse adders can throw off the average values by a lot during decel.