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  1. #11
    Member 292 Rep Points jeff's Avatar
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    Quote Originally Posted by Quisp View Post
    Stock diverter, GFB, ?
    Quote Originally Posted by CanadianGuy View Post
    Spring can weaken overtime and not close the valve. You would see something on the ap when not pulling boost. My next question is if you hear it at idle where/what side of the engine is it comming from?
    To my chagrin I did not look into an upgraded diverter valve when getting my turbo swap parts.......when you say I'd see something on the AP, which monitor do I need to look at? When I said I heard it at idle I didn't mean when the car is sitting there still, but the noise IS there when sitting still and gently revving, and also when coasting with no throttle input. Sounds like it's coming from the driver's side of the engine but I can't verify that since my head isn't under there!

    Now, I looked into the GFB piece and found this video....it only says the sound is gone so you can't hear what it did sound like....however it perfectly describes what I am experiencing as "low rev venting"...

    https://www.youtube.com/watch?v=0Fsc8R6Eqx4
    Hey, check out my build thread!

  2. #12
    Staff Team Staff Team 813 Rep Points CanadianGuy's Avatar
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    Look at the boost measurement. When idle it should be near -10. If higher than -9 diverter valve spring is weaken.

  3. #13
    Member 292 Rep Points jeff's Avatar
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    Quote Originally Posted by CanadianGuy View Post
    Look at the boost measurement. When idle it should be near -10. If higher than -9 diverter valve spring is weaken.
    Just cranked him up, was -9.8 for a few seconds. Gave it a little rev, it settled at -10.2 for a few minutes till I shut it off.
    Hey, check out my build thread!

  4. #14
    Staff Team Staff Team 813 Rep Points CanadianGuy's Avatar
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    Quote Originally Posted by jeff View Post
    Just cranked him up, was -9.8 for a few seconds. Gave it a little rev, it settled at -10.2 for a few minutes till I shut it off.
    That's good. Guess you need the two head approach one in the driver seat hitting the gas and one in the engine listening and poking.

  5. #15
    Member 292 Rep Points jeff's Avatar
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    Quote Originally Posted by CanadianGuy View Post
    That's good. Guess you need the two head approach one in the driver seat hitting the gas and one in the engine listening and poking.
    Haha. I went ahead and ordered a GFB DV+ per @Quisp. Couldn't hurt, with the upgrade I just did i should have anyway for other reasons. We will see if that fixes this noise.
    Hey, check out my build thread!

  6. #16
    Staff Team Staff Team 813 Rep Points CanadianGuy's Avatar
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    Quote Originally Posted by jeff View Post
    Haha. I went ahead and ordered a GFB DV+ per @Quisp. Couldn't hurt, with the upgrade I just did i should have anyway for other reasons. We will see if that fixes this noise.
    Now with even more boost! It's a good upgrade.

  7. #17
    New Member 36 Rep Points WhiteST's Avatar
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    I'm wondering if this is just a normal sound from the turbo. I think I may have the same sound on my x47. Went from 2jr intake to stock, still hear it.

  8. #18
    Member 292 Rep Points jeff's Avatar
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    OK UPDATE...

    Just installed the GFB DV+, noise is gone gone gone.

    Ahhhhhhh......................................



    Conclusion: Upgraded turbo either caused or increased volume of low rev venting which made annoying Gb (piano note) whistle. Upgraded diverter valve is the solution if you want to eliminate this noise, and is a good mod to have in general.

    Hope someone finds this thread and is helped in the future.
    Hey, check out my build thread!


 
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