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Thread: Limp mode at part throttle 6.1 Vortech v7

  1. #1
    Tuner in Training
    Join Date
    Aug 2020
    Posts
    20

    Limp mode at part throttle 6.1 Vortech v7

    Hi

    I have been chasing a problem on my Magnum for a long time and I cant pin point the problem,

    car goes in Limp at part throttle when going in low boost cruising on the high way mainly on third to 5th gear ,
    There is no code, just the lighting bolt in the dash, had to stop,, put in park, turn off key, open door and restart
    and car will drive fine until I go part throttle again but only after a long drive on the highway.

    It will do the same at the first burnout at the track on the first pass of the day only, then I am good for the day at the track doing multiple pass.
    on my way back home, after 15 minutes drive, It will go in limp again at part throttle and light boost.

    I can do hours of driving without problem If I stay out of boost.

    Have Change the Throttle body with no change.
    I am sure it is tune related.

    Anyone have a clue where to look in the tune ?
    this tune work very well at the track and on the street at the exception of this problem

    do not have any log when the problem occur since it happend mainly on the street

    magnum read 08102022 3 bar sensor new injector setting ve done.hpt

    2006 magnum SRT8
    405 forge motor
    Stock MMX 85 throttle body
    Vortech V7 on cog belt
    20 PSI of boost
    about 1000hp

  2. #2
    Tuner in Training
    Join Date
    Aug 2020
    Posts
    20
    Same tune without boost (belt off) doesn’t cause any problem at part throttle

  3. #3
    Advanced Tuner
    Join Date
    Jan 2022
    Posts
    904
    sounds like a logging issue

  4. #4
    Advanced Tuner
    Join Date
    Feb 2016
    Posts
    431
    Try enable sensed map - table 2100

  5. #5
    Tuner in Training
    Join Date
    Aug 2020
    Posts
    20
    Quote Originally Posted by Hemituna View Post
    Try enable sensed map - table 2100
    That had worked, no more limp at part throttle, thanks

    Enable map on the other hand is causing a really bad throttle hang over 4K rpm for about 1-2 second,
    Had to shut down ignition at the end of the strip and almost ran out of brake !
    Idle is also very bad,

    Any advise on how to solve this issues?

  6. #6
    Tuner in Training
    Join Date
    Nov 2016
    Location
    Austria/Europe
    Posts
    46
    Did you solve the problem? I got a Procharger on my Hemi and my TB always opens at crusing, also have to shut down ignition and very hard for the breaks.