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Thread: negative ltft and positive stft after cam swap

  1. #1
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    negative ltft and positive stft after cam swap

    Like the title says. Short terms are showing positive but the long terms are buried negative. I pulled some fuel out using ANN method and it runs worse. I'm guessing the ltft are wrong? Do I need to hook a wide band up here already? Just trying to get it running right before it hits the dyno. Could the o2s be trash? Q.CHARGER.002.hptq.001x2.hpl

  2. #2
    Advanced Tuner coanan's Avatar
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    Quote Originally Posted by JASON11WS6 View Post
    Like the title says. Short terms are showing positive but the long terms are buried negative. I pulled some fuel out using ANN method and it runs worse. I'm guessing the ltft are wrong? Do I need to hook a wide band up here already? Just trying to get it running right before it hits the dyno. Could the o2s be trash? Q.CHARGER.002.hptq.001x2.hpl
    Your tables don't match. bold must match in each table

    inj pulse width vs fuel mass and fuel mass vs inj pulse width. this one you open by clicking side, then paste in.
    Last edited by coanan; 08-06-2020 at 12:56 PM.
    2018 Trackhawk PCM/TCM tune by Dusterhoff.
    Flex Fuel, MMX faux 95mm TB, GripTec 2.85, 10% ATI lower, FIC1200, ARH 1 7/8 w/cats, 180 T-stat

    13 Chrysler 300S, RAM BGE 412 stroker, cam motion 232/246 619/619 118 +4, ATI 18% OD pulley
    Whipple Gen5 3.0, 2.50 upper pulley, Smooth Boost controller, FIC 1200 inj. Nick W 108mm TB, FORE dual return fuel system, E85, FTI 2800 stall(SRT83380), SHR WAR Viking trans and valve body, Getrag 3.73, 1 7/8 kooks w/hi-flow cats, 3" Magnaflow Cat-back 943rwhp

  3. #3
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    I'll try that again. Forgot about the inverse table.

  4. #4
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    I updated them and I'm still gettin the same issue

  5. #5
    That's a vct problem turn off nn and all vct tables to be able to make adjustments on your ve. Otherwise the vehicle will pull major timing because your cams moving and causing fuel swings. Or work with the new nn tuner up to you

  6. #6
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    I think we had one of the o2s switched around. It dialed right in after that. Now we need to fix the idle