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Thread: LTFT issues

  1. #1
    Tuner in Training
    Join Date
    Jun 2019
    Posts
    13

    LTFT issues

    Currently I?m having an issue with my LTFT at idle and WOT but it isn?t constant. They start out at -7ish then after idling for a bit they climb up to -20 Would could cause this? Very new to HP tuners so any help would be appreciated. What tables do i need to mess with in order to fix this

  2. #2
    Potential Tuner
    Join Date
    Jul 2019
    Posts
    3
    I'm experiencing the same thing. 12' zl1 (LSA)
    I'm starting to do my own tuning and it seems to be the VVE table that is causing this. I have some bolt ons (2.55" upper SC pulley, kooks headers, CAI, E85 conversion with boost a pump)
    In my tune, E67 ECU, I'm using the VVE under 2500 rpm then MAF above that. So idle is controlled by the VVE. At idle I'll go between a Lambda of 0.77 to 0.84 (I'm commanding 1.0) so I'm slowly bringing down my VVE table to get it closer to 1.

    You can use LTFT (if you stay out of PE) or a wideband to make your adjustments and build the VVE table in the scanner.

  3. #3
    Are you using a wideband? Are you running. sD or maf?

  4. #4
    Tuner in Training
    Join Date
    Jun 2019
    Posts
    13
    I?m currently running SD

  5. #5
    Potential Tuner BigMatt's Avatar
    Join Date
    Jun 2016
    Location
    Delaware
    Posts
    7
    Vacuum leak. I just went through the same thing with my Camaro. My bypass actuator had torn causing a big vacuum leak and ltft to go +25