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Resolved Can’t boost past 8psi

Posted by Dawson159, Aug 25, 2018

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  1. Dawson159

    Dawson159 Proven Member

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    Billings, Montana
    My car won’t boost past 8 psi it gets to 8psi then stays there steady no boost leaks or vacuum leaks

    I also took my actuator arm off and moved the wastegate and it moved freely but it acts like the wastegate is getting stuck open

    I have a Hallman mbc hooked up turned all the way down it doesn’t matter if I turn it up
     
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  2. boostdawd

    boostdawd Supporting Member

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    Sounds like your wastegate is the culprit. Do u have another one to try?
     

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    1997 Eagle Talon TSi AWD
    awd · automatic · 2G DSM

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    manual · 1G DSM
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  3. Dawson159

    Dawson159 Proven Member

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    I do not
     
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  4. Dawson159

    Dawson159 Proven Member

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    Billings, Montana
    Wait will a Garrett t25 wastegate work?
     
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  5. Buddy2

    Buddy2 Proven Member

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    Helsinki, Europe
    You could either have faulty wastegate, actuator or incorrect wastegate preload. Check preload and if it wont work check that actuator is working properly. if this does not help take manifold off and check for any psychical damage in wastegate flapper itself. Is car boosting later than it should be? This would indicate incorrect preload or damaged flapper or manifold seals blowing by alot.
     

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    1995 Mitsubishi Eclipse GST
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  6. Buddy2

    Buddy2 Proven Member

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    372  9

    1992 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

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    1992 Mitsubishi Eclipse GSX
    manual · 1G DSM

    669  8

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  7. Vegas Smith

    Vegas Smith Proven Member

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    I'd check eBay or he classifieds for a wastegate instead of taking it all apart.
     

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    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  8. pauleyman

    pauleyman DSM Wiseman

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    oklahoma city, Oklahoma
    If Watergate actuator ever failed you should get infinite boost. Try these steps. Take the arm off. Wire the waste gate shut. Drive the car. Do NOT go WOT. just. Quick stab and see where boost goes. If it shoots above 8 you've got something wrong in the actuatir/control. If it went to 8 and feels faster than before you've got a problem with the boost gauge. Are the mods recent? Did it used to boost well before? What has changed? Do you have the boost controller hooked up correctly? Show us. You can rule out both the hard parts and the control in 10 minutes.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  9. Dawson159

    Dawson159 Proven Member

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    Billings, Montana
    The mods are not recent the 16g was installed about 2 weeks ago which was the most recent one, I was driving it and it suddenly stopped going past 8psi, my ic piping blew off the same day it stopped going past 8 psi (my fault),it used to boost perfectly to 14 psi which is what I had it tuned for,the Mbc is hooked up correctly I’ll show u when I get out of bed.
    I’m probably gonna remove the mbc and run wastegate pressure to elininate that as an issue next
     
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  10. pauleyman

    pauleyman DSM Wiseman

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    oklahoma city, Oklahoma
    Please tell me you did a boost leak check. Check the manifold to turbo bolts also
     

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    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  11. Dawson159

    Dawson159 Proven Member

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    I didn’t get to do anything to it today but yes I did a blt and there is no leaks
     
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  12. Dawson159

    Dawson159 Proven Member

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    Billings, Montana
    Update: I took my boost controller off and it still only went to 8psi so Its definitly the wastegate actuator
     
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  13. Dawson159

    Dawson159 Proven Member

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    Ended up being a broken wastegate actuator
     
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  14. Vegas Smith

    Vegas Smith Proven Member

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    I called it!
     

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    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  15. arrowhead

    arrowhead Proven Member

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    You get the medal, congrats.
     

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    1998 Eagle Talon TSi
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