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whirling noise

  • 14-12-2011 12:41am
    #1
    teednab-el
    Registered Users, Registered Users 2 Posts: 2,971 ✭✭✭


    I sat into and got a spin from my friends 06-GT golf tdi140bhp remapped from 105bhp. I noticed when he changed gears you could hear very clearly a whirling noise very similiar to that of a police siren. Yes it was like that. I asked him what was that noise and he said that the previous owner put something into the engine to do that. By the sounds of it I thought his turbo was on the way out. Is this a type of valve that was installed or what is it? I know in my tdi car I might hear a whirling noise but its very slight barely noticable. Can someone inform me of this noise that is coming from my friends car? Thanks.


Comments

  • #2
    damo86
    Registered Users, Registered Users 2 Posts: 1,091 ✭✭✭damo86


    had the same, its the turbo! Police siren rings a bell, always looking around me just in case haha.

    early signs for it going boom. Does he have any loss in performance? Slow to build boost? Smoky?

    D


  • #3
    challengemaster
    Registered Users, Registered Users 2 Posts: 16,930 ✭✭✭✭challengemaster


    Just to be clear, it isn't this we're talking about is it?

    https://www.youtube.com/watch?v=CNA0MXu5CpI


  • #4
    teednab-el
    Registered Users, Registered Users 2 Posts: 2,971 ✭✭✭teednab-el


    challengemaster wrote: »
    Just to be clear, it isn't this we're talking about is it?

    https://www.youtube.com/watch?v=CNA0MXu5CpI
    No definately not. When engine is slowing down or speeding up you hear it clearly its like a very slow sounding police siren. More of a whistling noise if anything and you can hear it clearly when car is travelling slowly.


  • #5
    teednab-el
    Registered Users, Registered Users 2 Posts: 2,971 ✭✭✭teednab-el


    damo86 wrote: »
    had the same, its the turbo! Police siren rings a bell, always looking around me just in case haha.

    early signs for it going boom. Does he have any loss in performance? Slow to build boost? Smoky?

    D
    Not that I know of. Car seems to be going fine so far.


  • #6
    MugMugs
    Registered Users, Registered Users 2 Posts: 17,875 ✭✭✭✭MugMugs


    challengemaster wrote: »
    Just to be clear, it isn't this we're talking about is it?

    https://www.youtube.com/watch?v=CNA0MXu5CpI
    Dump valve yer TDI there fella.... why do people do that :/


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  • #7
    teednab-el
    Registered Users, Registered Users 2 Posts: 2,971 ✭✭✭teednab-el


    Jessy12 wrote: »
    sounds like you can hear the turbo spooling.
    Dump valve / BOV is another option where you'll hear it spool followed by a nice whut usssssh, or a flutter depending on which one they've got on.g.php

    This is like a very slow whistle police siren. Sounds like the turbo spooling. It doesn't sound like any valve type system. At Low revs you can hear it clearly. I thought those valve systems only make noise when changing gear, would I be right in saying that? This whirling noise in the cars engine keeps going even without gear changing.


  • #8
    Damokc
    Registered Users, Registered Users 2 Posts: 1,432 ✭✭✭Damokc


    Jessy12 wrote: »
    sounds like you can hear the turbo spooling.
    Dump valve / BOV is another option where you'll hear it spool followed by a nice whut usssssh, or a flutter depending on which one they've got on.g.php

    One of the reasons for Blow Off/Dump Valves is to prevent Flutter. Flutter is when air is pushed back through the spinning turbo in the wrong direction when the throttle is shut. BOV/DV vent this surplus air out so this doesn't get pushed back through the turbo. This fluttering also slows your turbo spinning so thats why these valves are added.


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