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Reasons for boost controller failure?

Posted by yepes281, May 10, 2010
Bolt-on Tech - 4G63 intake, exhaust, intake manifold, ignition, fuel system, cooling, etc.

  1. yepes281

    yepes281 Proven Member

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    So ive gone through 3 boost controllers in the past 2 months. Is there anything that would cause boost controller failure?

    2 were turbo xs, and 1 hallman that was only a few months old.
    #1
  2. Gstclipse69

    Gstclipse69 Proven Member

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    What went wrong with them? Did they overboost or under?
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  3. yepes281

    yepes281 Proven Member

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    All overboosting
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  4. LandoAWD

    LandoAWD Retired

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    Verify your wastegate functions properly. TurboXS units actually failing wouldn't surprise me, but a Hallman would.
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  5. yepes281

    yepes281 Proven Member

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    The wastegates working good, im running off wastegate pressure right now.
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  6. LandoAWD

    LandoAWD Retired

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    How were you referencing boost to the MBC?
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  7. yepes281

    yepes281 Proven Member

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    Uhhhh you mean like, side nipple wastegate to side nipple boost controller, bottom nipple boost controller to nipple on turbo?
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  8. ramsack

    ramsack Banned Member

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    are you getting the boost reference for the wastegate from directly off the compressor/j-pipe or somewhere off the intake manifold?
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  9. yepes281

    yepes281 Proven Member

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    Oh directly off the compressor.
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  10. andy4g63

    andy4g63 Proven Member

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    Don't know about the XS MBC, but Hallman, not possible. The reason for this is simple:
    --Isnside Hallman you have a spring and a ball/facing the feeding nipple-from comp. cover/ and then another nipple/90* off the inlet one. As soos as the air overcomes the spring pressure it's going out to the WG... That is it.
    --There are several things to look for, assuming that your WG is 100% working:
    - Both nipples are threaded into the body of MBC. They have on O-ring at the end. It is however possible, that inlet and or outlet nipples got a little loose and you have a minor leak there, but this will cause overboosting you basically bleeding more pressure , before it reaches the WG therefore increasing PSI at which the WG opens.,

    I had a case in which my Hallman/in-cockpit/, got one side a little loose/where the cable was attached and I was doing 28 PSI on pump and certainly I wasn't happy...

    -- Second, there is a bleeder hole on the nipple to the WG- it should be there. If someone put another nipple with no hole, or the hole is closed for some reason, that will cause over boosting, because between shifts the excess air bleeds form there and if this isnot happening you'll be hitting huge spikes in boost......
    #10

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