can't control boost

Discussion in 'Modifications & DIY how-to' started by jayjaysti, Feb 10, 2009.

  1. jayjaysti

    jayjaysti Member

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    so my car is acting crazy. is not letting me go over or lower from 15-16psi. i already check for leaks
    and nothing dont know what to do. need help
     
  2. WRXCoupe

    WRXCoupe Active Member

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    List of mods, mileage, duty: severe v.s. not, maintenance? if any? yada yada!
     
  3. Sparta

    Sparta Active Member

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    did u ever get tuned
     
  4. jayjaysti

    jayjaysti Member

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    mods:

    full turbo back
    vf22
    turbo xs FMIC
    AP V1 custom map for the vf22
    K&N short ram intake
    Forge manual boost controller
    just replace all belts in the car

    the car has 86,000
     
  5. Sparta

    Sparta Active Member

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    probably has something to do with it
     
  6. jayjaysti

    jayjaysti Member

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    got a custom map for the vf22 it was runing fine. this start happening right after my cluth started to give out 3 months ago
     
  7. jayjaysti

    jayjaysti Member

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    i try 3 boost controllers and the same
     
  8. GTscoob

    GTscoob Black is Beautiful

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    Did you try the stock BCS and have you reset the ecu recently?
     
  9. jayjaysti

    jayjaysti Member

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    no i havent try the stock bcs and yes i reset the ecu 1 week ago i have a front 02 sensor bad could that be it what driving me crazy is that it wont go over or lower from 15-16 psi
     
  10. GTscoob

    GTscoob Black is Beautiful

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    I'd try the front 02 sensor first, its really easy to swap out and is much more integral to the ECU than the rear, which is just used for comparison readings to see how effective the cats are.

    Have you datalogged the car recently to see what the ECU is seeing differently? If everything is mechanically sound than its something with the tune, ECU, or sensors. Could even be the MAF reading air wrong . . .
     
  11. WRXCoupe

    WRXCoupe Active Member

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    I would guess, boost leak, boost control, possibly check the MAF with the short ram, if the 02 sensor is bad it could be contributing as well.

    I had a boost situation recently and it turned out to be the waste gate. Top Speed started by checking for boost leaks: hoses, connectors, tmic, then the boost controller. We ended up at the turbo through the process of elimination. It turned out to that the waste gate wouldn't hold pressure. If you have the cash I would take it to TS and get it done right. Probably save you time, money and avoid more problems down the road.

    I would check all the hoses connections for a boost leak first.
     
    #11 WRXCoupe, Feb 11, 2009
    Last edited: Feb 11, 2009
  12. goixiz

    goixiz Active Member

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    wont go over or lower from 15-16 psi ???? explain ? so is it stuck at 15-16 psi ?

    connect the WG line to turbo outlet direct (no MBC) = if its still 15-16 then wg issue
    if not than MBC. are the lines to the MBC connected correctly (even only 2 lines)


    custom map ?
    custom for which setup
    what about the BOV ?
     
    #12 goixiz, Feb 11, 2009
    Last edited: Feb 11, 2009
  13. jayjaysti

    jayjaysti Member

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    yes is tock on 15-16 psi. im runing a hks ssq bov full recirculated

    and the map is for the vf22
     
  14. Sparta

    Sparta Active Member

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    your sure your gauge isnt just broken?
     
  15. jayjaysti

    jayjaysti Member

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    i had someone ride with me and check with the AP and it would only go up to 17 psi
     
  16. Mike@TTR

    Mike@TTR Active Member

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    Have you changed out anything since the tune? Added any new parts? If it is a manual boost controller, where is it located?
     
  17. Deke

    Deke Active Member

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    x2, It doesn't make sense to me that your boost won't go any lower than 15 PSI. That means the turbo is perpetually spooled up.
     
  18. Trancetto

    Trancetto Active Member

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    lol stuck at 16 psi. At least you wont have to worry about turbo lag.
     
  19. Mike@TTR

    Mike@TTR Active Member

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    I think he means it is supposed to be a higher boost level, like 19 or 20 and it is only hitting 16-17.
     
  20. UpSideDownDesi

    UpSideDownDesi Active Member

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    yea he's suppose to be boosting higher.
     
  21. goixiz

    goixiz Active Member

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    what a mess
    need to describe issue better so you can get people to help

    bov not able to close ?
    MBC bad ?
    are you sure no boost leak ? damage BOV gasket ?
     
  22. jayjaysti

    jayjaysti Member

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    ok so i try this ^^^ and i went down to 11 psi. so i guess is not the WG
     
  23. jayjaysti

    jayjaysti Member

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    is located close to the oem BCS on top closer to the turbo
     
  24. Doug@DBW Motorsports

    Doug@DBW Motorsports Active Member

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    How did you check it for boost leaks?

    Try pulling the line off the wastegate and see if the boost goes over 15. Just be sure to let out of the gas if it does go over 15psi or else it could end up boosting 20+ psi and breaking something.
     
  25. Doug@DBW Motorsports

    Doug@DBW Motorsports Active Member

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    Is your MBC hooked up by itself with one line coming from the turbo to the MBC and then out of the mbc to the wastegate?
     
  26. integroid

    Supporting Member

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    I have a good needle valve MBC I will sell you for $45 if you need one.
     
  27. jayjaysti

    jayjaysti Member

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    yep
     
  28. jayjaysti

    jayjaysti Member

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    im going to try this and check back on here
     
  29. jayjaysti

    jayjaysti Member

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    ok today out of nowhere i did a 4th gear pull and i hit 19 psi. any one knows how to do a boost leak test
     
  30. jayjaysti

    jayjaysti Member

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    bump:unamused:
     
  31. Mike@TTR

    Mike@TTR Active Member

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  32. Mike@TTR

    Mike@TTR Active Member

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