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  1. S

    Boost Fluctuation only over 4krpm

    Hello. I've changed the bov, the wastegate is an hks gt gate so should be ok but il try and get it off and pull it apart asap
  2. S

    Boost Fluctuation only over 4krpm

    No, I have checked everypipe, clamp etc. There is no sign of a boost leak before 4000rpm when running 18psi.
  3. S

    Boost Fluctuation only over 4krpm

    Hi - I am having a problem with boost pressure fluctuating over 4krpm. The car starts to pull hard from 3200 rpm in high gears, I hit about 18psi on a T63 at 3800, as soon as I hit 4000 rpm I get a quiet chchchch noise and see the boost gauge fluctuating...... Before this, I was out tearing...