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Boost Control issues -- overshooting by 9#

Discussion in 'FAST Support Forum' started by Turbopowered68, Oct 11, 2018.

  1. Turbopowered68

    Turbopowered68 New Member

    Joined:
    Mar 28, 2017
    In need of advice,
    I also have a log
     

    Attached Files:

    Last edited: Oct 12, 2018
  2. Turbobitt

    Turbobitt Member

    Joined:
    Nov 14, 2010
    Since there are so many factors, More info required...
    1 - Boost strategy(open loop, closed loop map or closed loop analog 8 control)
    2 - PID settings if running closed loop control.
    3 - Type of waste gate and solenoid used.
    4 - Boost or Co2 supply to the gate.
    5 - PA(Time based) boost table or TPS based table
    AG.
     
  3. Turbopowered68

    Turbopowered68 New Member

    Joined:
    Mar 28, 2017
    1- Closed - Map
    2- P=89.8, I=69.8, D=69.8
    3- 44mm, MAC 3 port
    4- Turbo
    5- TPS
     
  4. Turbobitt

    Turbobitt Member

    Joined:
    Nov 14, 2010
    In my opinion the PID setting look a little off. I would at minimum lower the D gain to about 30. Maybe try going to 100 on the P gain.
    AG.
     
  5. Turbopowered68

    Turbopowered68 New Member

    Joined:
    Mar 28, 2017
    Thanks
     
  6. Turbobitt

    Turbobitt Member

    Joined:
    Nov 14, 2010
    FWIW my PID settings are 100,60,25. Also, should have asked what your min map KPA value is set at. The XFI won't control boost until that min map value is met. Looking closer at your logs, your min map may be to close to the desired boost set point.
    AG.
     
  7. Turbopowered68

    Turbopowered68 New Member

    Joined:
    Mar 28, 2017
    i just did a test hit
    P slew = 1000
    N slew = 1000
    Min KPA =100
    Overboost =249
    P=100
    I=69.8
    D=20
    Boost target setting 60% = 189KPA = 13 PSI
     

    Attached Files:

  8. Turbobitt

    Turbobitt Member

    Joined:
    Nov 14, 2010
    I think your waste gate spring may be to heavy for the boost levels your trying to achieve. if you look at the solenoid DC, it can't get down fast enough to make a response in the boost pressure. there may not be enough available boost to work against the waste gate and open it. If this is true, there are no PID setting that will fix that.
    AG.
     

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