Boost leak or wrong procedure of test?

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  • A80Avant
    S2Forum Obsessed
    • Sep 2005
    • 10873
    • Country: Greece

    #16
    i see.i will have to change the hoses that go to the N75 valve and then check the bottom turbo hoses for leaks.i couldnt see a leak coming from anywhere higher.

    so could the leak only reduce my boost on higher revs and give me no other symptom?cause i cannot imagine anything else.the car drives fine...

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    • A80Avant
      S2Forum Obsessed
      • Sep 2005
      • 10873
      • Country: Greece

      #17
      someone told me that the DV valve does not close fully on a turned off engine and it actually does so only in vacuum.Is that possible?Is it possible maybe with this forge valve?

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      • newsh
        S2Forum Obsessed
        • Aug 2003
        • 16226
        • Country: United Kingdom

        #18
        Originally posted by PapVas
        someone told me that the DV valve does not close fully on a turned off engine and it actually does so only in vacuum.Is that possible?Is it possible maybe with this forge valve?
        The vacuum OPENS the valve, its the spring that holds it closed. Anyway, its irrelevant, when you pressure test there is pressure on both sides of the valve so it will only leak if there is a hole in it or one of its tubes.

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        S2 Avant

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        • A80Avant
          S2Forum Obsessed
          • Sep 2005
          • 10873
          • Country: Greece

          #19
          perfect.
          thanks for setting that straight for me newsh!

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