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Thread: Boost problem Z20net

  1. #1
    Regular Member blue estate's Avatar
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    Default Boost problem Z20net

    Done the seraches on here for possible issues causing this.. found nothing i already know of

    Basically its like driving a car without a turbo at times!? Boost up to 5psi.. if im lucky sometimes 10psi.. when she was running good i get about 16psi

    No fault light has come up when the car is runing poo.. but seems to be running naff all the time now

    I have replaced both the small boost sensors about a year ago.. on top of the actuator and the one at the front of the engine... could these go belly up again? Are they man enough to be running with BSR stage 3 or will this not make any difference?

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    Regular Member sberrow's Avatar
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    Im running a derivative of stage 3 bsr and i go through boost sensors like they were made from butter, every 4-6k miles. the further i get away from bsr map the better it gets. do make sure you get the sensors the right way round. ie the right part no. in the right place.

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    Regular Member sberrow's Avatar
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    does it rest after you turn the egnition off and on??

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    Regular Member blue estate's Avatar
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    I swapped the sensors one at a time to make sure i didnt mix em up.. i know what im like lol

    It is ok to start with on a new journey after ignition off, then plays up again after that

    Might go get a new pair of sensors then as its about that kind amilage i have covered.. thanks

  5. #5
    Ex Vec-C Admin Deztroyer's Avatar
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    also the integrated recirc dump valve diaphragm/spring may be weakened or split ... there is a repair kit from VX which is about £100

    part no 55558271 this was the primary cause of mine when we initially though it was the recirc valves
    once replaced i didn't loose boost or drop into lhm during overtakes

    mine had hairline splits on the edges allowing air to escape at the most inopportune moments

    0-Large smile ......every time it's driven

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    Regular Member mann3210's Avatar
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    how do you know if your turbo is playing up? iv noticed some times my car is performing superb but some days it feels like its holding back ever so slightly still very sweet but just not as great as the better days lol

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    Regular Member blue estate's Avatar
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    Quote Originally Posted by deztroyer View Post
    also the integrated recirc dump valve diaphragm/spring may be weakened or split ... there is a repair kit from VX which is about £100

    part no 55558271 this was the primary cause of mine when we initially though it was the recirc valves
    once replaced i didn't loose boost or drop into lhm during overtakes

    mine had hairline splits on the edges allowing air to escape at the most inopportune moments
    I can still hear 'dumping' from the engine.. would it still do this if what you said was split in anyway?

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    Ex Vec-C Admin Deztroyer's Avatar
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    Quote Originally Posted by blue estate View Post
    I can still hear 'dumping' from the engine.. would it still do this if what you said was split in anyway?

    yep ... it would just be dumping the boost early before optimum pressure is reached

    0-Large smile ......every time it's driven

  9. #9
    Regular Member blue estate's Avatar
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    Ordered the two sensors again.. cheapest first as you say lol.. hope that sorts my little rocket out

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    Regular Member Jezzy's Avatar
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    Quote Originally Posted by deztroyer View Post
    also the integrated recirc dump valve diaphragm/spring may be weakened or split ... there is a repair kit from VX which is about £100

    part no 55558271 this was the primary cause of mine when we initially though it was the recirc valves
    once replaced i didn't loose boost or drop into lhm during overtakes

    mine had hairline splits on the edges allowing air to escape at the most inopportune moments
    Dez, was your problem intermittent or did it happen every time?

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