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What makes the boo noise?

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  • 24-01-2021 4:18am
    #1
    iQuain
    Registered Users Posts: 34 ✭


    I’d like to think I know a bit about how a car works. I can understand how most technical components work and I’m able to carry out most of the maintenance on my cars myself. However, I still do not for the life of me know what makes the boo sound that you hear coming from the modified cars young lads drive. Help a buddy out here with some knowledge?


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    #2
    Miscreant
    Registered Users Posts: 2,209 ✭✭✭Miscreant


    iQuain wrote: »
    I’d like to think I know a bit about how a car works. I can understand how most technical components work and I’m able to carry out most of the maintenance on my cars myself. However, I still do not for the life of me know what makes the boo sound that you hear coming from the modified cars young lads drive. Help a buddy out here with some knowledge?

    I believe it's a modification to the turbo blow off valve in some of these cars. Usually a diesel golf or A4 or similar. I have heard of it being called a pigeon valve because of the sound it makes.
    Each to their own I suppose. 🙂


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    #3
    Gumbo
    Moderators, Society & Culture Moderators Posts: 38,515 Mod ✭✭✭✭Gumbo


    iQuain wrote: »
    I’d like to think I know a bit about how a car works. I can understand how most technical components work and I’m able to carry out most of the maintenance on my cars myself. However, I still do not for the life of me know what makes the boo sound that you hear coming from the modified cars young lads drive. Help a buddy out here with some knowledge?

    A Dump Valve.

    A blow-off valve, dump valve or compressor bypass valve, is a pressure release system present in most turbocharged engines. Its main purpose is to take the load off the turbocharger when the throttle is suddenly closed.


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    #4
    User1998
    Registered Users Posts: 5,925 ✭✭✭User1998


    That’s something different ^ The ‘boo’ or ‘coo’ is from a straight piped exhaust. You remove the rear back boxes and other bits from the exhaust system and add a section of metal pipe to replace it. When I was younger I removed the backbox off my 1.9 tdi Passat and it ‘cood’ but removing the backbox alone doesn’t make it overly loud. Theres other sections that need cutting out also. Sorry link isn’t working

    https://youtu.be/65_6nVlpxok


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    #5
    CoBo55
    Registered Users Posts: 8,819 ✭✭✭CoBo55


    I thought it was dump valve re-routing but there's no dump valve on the vnt turbo the vag cars use. As was said earlier they remove silencer boxes from the exhaust.


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    #6
    Henry Ford III
    Moderators, Business & Finance Moderators Posts: 17,635 Mod ✭✭✭✭Henry Ford III


    Dump valve. Speaking of which.........


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    #7
    Badger2009
    Registered Users Posts: 328 ✭✭Badger2009


    I always thought it was a mandatory modification to warn other road users that a dope is driving.


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    #8
    Cerveza
    Closed Accounts Posts: 424 ✭✭Cerveza


    Decat and other silencers in the system if needed. The more straight piped you get it the more it choos.


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    #9
    alias no.9
    Registered Users Posts: 6,266 ✭✭✭alias no.9


    Gumbo wrote: »
    A Dump Valve.

    A blow-off valve, dump valve or compressor bypass valve, is a pressure release system present in most turbocharged engines. Its main purpose is to take the load off the turbocharger when the throttle is suddenly closed.

    There's no throttle on a diesel so no dump valve, as mentioned above, modified exhausts in most cases that might be heard these days


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    #10
    Gumbo
    Moderators, Society & Culture Moderators Posts: 38,515 Mod ✭✭✭✭Gumbo


    alias no.9 wrote: »
    There's no throttle on a diesel so no dump valve, as mentioned above, modified exhausts in most cases that might be heard these days

    OP never said anything about diesel?


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    #11
    User1998
    Registered Users Posts: 5,925 ✭✭✭User1998


    Petrol cars don’t make the boo noise, only old diesels do. Dump valve is a different noise


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    #12
    mickdw
    Registered Users Posts: 23,280 ✭✭✭✭mickdw


    User1998 wrote: »
    Petrol cars don’t make the boo noise, only old diesels do. Dump valve is a different noise

    Some of them do


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    #13
    Cerveza
    Closed Accounts Posts: 424 ✭✭Cerveza


    A turbo petrol do


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    #14
    passatman86
    Registered Users Posts: 1,813 ✭✭✭passatman86


    1000's of youtube videos are self explanatory
    There's a difference between diesel and petrol alright


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    #15
    alias no.9
    Registered Users Posts: 6,266 ✭✭✭alias no.9


    Gumbo wrote: »
    OP never said anything about diesel?

    Correct, but they mentioned specifically
    iQuain wrote: »
    the boo sound that you hear coming from the modified cars young lads drive.

    A scene that is dominated by VAG and BMW diesels these days and anyways a dump valve makes a hiss rather than a boo.


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    #16
    dkd21
    Registered Users Posts: 117 ✭✭dkd21


    The sound comes from the exhaust pressure releasing from the variable vane turbo . Its always there but fit a straight pipe and it will allow the sound to exit at the tailpipe instead of being muted by the silencer


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    #17
    User1998
    Registered Users Posts: 5,925 ✭✭✭User1998


    Even on a standard diesel it makes the boo noise but you’d barely notice it


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    #18
    AMKC
    Registered Users Posts: 15,647 ✭✭✭✭AMKC
    Ms


    User1998 wrote: »
    That’s something different ^ The ‘boo’ or ‘coo’ is from a straight piped exhaust. You remove the rear back boxes and other bits from the exhaust system and add a section of metal pipe to replace it. When I was younger I removed the backbox off my 1.9 tdi Passat and it ‘cood’ but removing the backbox alone doesn’t make it overly loud. Theres other sections that need cutting out also. Sorry link isn’t working

    This should be illegal and punishable by 10 years in prison. See how much they would know about doing stupid things like that to perfectly good cars then or if there would even be any cars that could do that too then because they will be all electric by the time they get out of prison.

    https://youtu.be/65_6nVlpxok
    Badger2009 wrote: »
    I always thought it was a mandatory modification to warn other road users that a dope is driving.

    That is the truth. They have a tiny weeny todger so are trying to compensate for in other ways thep poor fools.
    Cerveza wrote: »
    Decat and other silencers in the system if needed. The more straight piped you get it the more it choos.

    The more idioutic and stupid it sounds. Thankfully there has been none of these idiots around here in a while now. Maybe the Pandemic might do one more good thing and kill this trend off for a while at least.

    Live long and Prosper

    Peace and long life.



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    #19
    i57dwun4yb1pt8
    Closed Accounts Posts: 2,655 ✭✭✭i57dwun4yb1pt8


    its the calling sound of the lesser penised spunk trumpet


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    #20
    [Deleted User]
    Posts: 14,344 ✭✭✭✭ [Deleted User]


    What makes the boo noise?

    Other motorists and pedestrians.


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