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Thread: Low boost problems

  
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    MonkeeBoy's Avatar
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    Low boost problems

    Hey peeps got a problem with my boost levels it usually overboost 11-12 psi and holds 8-9 psi, for anyone who reads my auto-bio knows I that I had and air leak which is allfixed now but since then car isn't boosting right and only goes to 4 psi

    On start up there's quite a bit of smoke comin from the manifold area but that lasts only a second, my mate says it could be a pre-cat not fitted properly or manifolds cracked. But he precat was fitted a while ago. And niot had boost problems. Would bsc have anything to do with low boost levels. The car drives fine but just would boost pass 4 psi any help?
    >>Diary<< Status: ...........Slow and Steady.... may update more often...
    Last Updated: 27/10/2014

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    Bump... Anyone?
    >>Diary<< Status: ...........Slow and Steady.... may update more often...
    Last Updated: 27/10/2014

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    Unhappy

    Last bump before I lose hope and throw a Molotov through the window of my car and be at peace... Nah only joking but this will be the last bump though
    >>Diary<< Status: ...........Slow and Steady.... may update more often...
    Last Updated: 27/10/2014

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    If there is smoke coming from the front, it suggests either a cracked manifold or turbo oil seals have gone. I would have thought with a cracked manifold you would still get more than 4 psi of boost.
    Black Astra Coupe Turbo

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    BurrTony's Avatar
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    When you said the car drives fine did you mean for a car only producing 4psi or the same as it always has?

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    you could drop pre cat and check the play in shaft and see if you can see any cracks?use your phone to record with light on if cant get in there to see.

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    Quote Originally Posted by BurrTony View Post
    When you said the car drives fine did you mean for a car only producing 4psi or the same as it always has?
    It only boosts to 4psi when it's usually holding at 8-9psi and when I say it drives fine I mean it pulls normally (like qauter throttle) and here's no hesitence and no lumpy idle. I even drives fine when I put my foot down, it's that it sleet feel like it pullin as hard that's when I looked at the boost gauge reading 4psi
    >>Diary<< Status: ...........Slow and Steady.... may update more often...
    Last Updated: 27/10/2014

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    So you are either loosing boost or not making it. It could be a whole range of causes but if its happened suddenly I would check your waste gate is operation correctly and isnt jammed half open.

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