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Thread: truck keeps giving fuel after I lift the throttle

  1. #1

    truck keeps giving fuel after I lift the throttle

    I am having an issue with when I floor the truck and let off it keeps on fueling. It is a gradual slope down after I lift until it gets down to 0 mm3. I tried messing with the main droop and alt. droop settings. I tried raising the values up to like 40 mm3 at 4000 rpm, with the thought that it would be able to take fuel away quicker after I lift but that just made the truck extremely slow. Full throttle barely gave it any fuel. So I put it back down to the setting I have in the tune below and it feels good, but it is a kind of unnerving feeling when you let of the throttle and it keeps on going for a second. Does anyone know what would be causing this or what the droop tables are used for. Thankschananged droop seetings back to 10.20.hpt

  2. #2
    Advanced Tuner
    Join Date
    Jan 2018
    Posts
    683
    Droop settings is part of PID control for regulating the governor it?s tied with.

  3. #3
    Advanced Tuner
    Join Date
    Jan 2018
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    683
    http://www.woodward.com/-/media/publ...6/55/01302.pdf

    This is more geared towards generator speed control application but it?ll give you the bare basics on its theory.

  4. #4
    ok, I kind of get it. So when I put higher values in the table it must just be starting to enable the governor way early? maybe. Do you know what I could mess with to have it return fuel back to just like the minimum fuel to idle after I floor it and let off the throttle? I was looking at my log and after I lifted it is a straight slope down from like the 2700 us to 0 but it took it around 3 seconds to do so. thanks

  5. #5
    Advanced Tuner
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    Jan 2018
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    683
    I haven?t looked at your tune or anything but sometimes it can be from rail pressure hanging high.

  6. #6
    Potential Tuner
    Join Date
    Mar 2019
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    3
    Try changing the deceleration limit in the governors tab. I had this on my manual 06 so I set the rate select rpm to 8000 to keep it from coming on and it seemed to work. I cant log it tho. I was going to pull this tune back over to EFILive to verify.

  7. #7
    awesome that seems like what is probably going on. I just didn't see that table before. Im gonna try it out then I let you know if that fixes it. thanks

  8. #8
    thanks arin, that did it!! It took the fuel out way quicker than before.

  9. #9
    Potential Tuner
    Join Date
    Mar 2019
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    3
    Good! This specific issue was one of the reasons I bought HP Tuners.