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Thread: A little overboost problem!!

  
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    Angry A little overboost problem!!

    During the weekend, i noticed that my cars vacum hose was split. This is the hose from the side of the turbo to the back of the engine, anyways as soon as i changed it and took the car out for a spin, i noticed that my car was overboosting to 20psi. Usually my car runs around 15psi, so you can imagen the shock i got when i saw this. I was just wanting to know if anyone has ever experienced this??? All i can bring it down to is that the ecu is trying to re learn everything again, since i replaced the vacum hose? Since i know the turbo is pretty useless past 15psi i know that the car wouldn't be making any extra power, but its still a concern for the engine internals.

    Has anyone ever seen this??

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    Shane's Avatar
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    I noticed the same thing when my vacum hose split. I just took it that the higer boost figure was always the accurate one and the lower reading i had been seeing was wrong due to air leaking in and depresurising the vacum.
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    If the vac hose was split and it fed the boost gauge then your gauge would have been reading low.
    Tell me what you've done, not what you're going to!

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    Are we talking Z or C 20LET?

    I cant see how a split vacuum hose from the turbo can cause less boost. There are 3 hoses on the C20, one to the standard recirc, one to the actuator and one that feeds the amal valve (and ultimately the actuator) if either of these is split then the actuator would be opening less giving more boost.

    The C20 also takes the map sensor (and normally the boost gauge) reading from the throttle body.

    The Z20 could of course be completely different.

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    i know when my car was boosted they did something to the acuator, maybe because the vac hose was broken when it was tuned it could have caused a problem and may have been boosted too much?

    Only speculating on this however.

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