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Thread: Blend tuning and histogram questions

  1. #1
    Tuner in Training
    Join Date
    Nov 2024
    Posts
    36

    Blend tuning and histogram questions

    I have individually tuned the MAF and my VE table. I also heard about "blend" tuning as in tuning both at the same time. I want to make sure my tune is correctly set up for it, and also I am a little confused on my VE histogram. At ~14.7 AFR it will populate as if it is running lean and I am getting confused. Histogram is straight from Goat Rope Garage. Is the point of the VE histogram not to get you as close to stoich (14.7 right?) as possible? Thanks for any advice and if you send me to a long thread to read I will do so.
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  2. #2
    Advanced Tuner
    Join Date
    Oct 2004
    Posts
    686
    Your log is running in open loop, but you have not cleared your LTFTs. You have to use the scanner controls to manually clear them after a reflash, or they persist, which changes your fueling by whatever percentage they have learned from the last time you were in closed loop.

  3. #3
    Tuner in Training
    Join Date
    Nov 2024
    Posts
    36
    Do I need to clear LTFT every time I flash a new tune or only after entering open loop from closed loop?

  4. #4
    Advanced Tuner
    Join Date
    Oct 2004
    Posts
    686
    Every time you flash a new tune you need to clear them. That is, unless you have a reason to want the old trims to persist, such as flashing a change that is not related to fuel tuning. Or if you have only been running open loop and there are no fuel trims.