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Thread: Very weird turbo noises #with audio# - 2.0 TFSI CDNB

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  1. Question Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Hello guys.
    I hope someone can help me with a problem that bothers me now for WAY too long. I'm willing to spend some $$ for successful (!) help.
    It's a whistle / squeak that comes from the turbocharger or near associated parts.
    The sound itself is various. Have it about 2 years now.
    It does not occur in idle - only under load. IHI Turbocharger.

    Heres the soundfile:
    Youtube Video
    Weird Turbo Sound - A4 2.0 TFSI CDNB - YouTube

    If I push the gas pedal very carefully it starts later in RPM. If I floor it it starts almost immediately.
    I can make the sound start at about 1200 RPM - stays all the way up if i keep accelerating.

    Some things i noticed:
    Its more quiet when the oem airfilter-box is installed. Much more louder with open airfilter (mushroom). But sound is present in both cases.
    I thought the turbo starts at 2200 RPM or something? So why does it occure even at 1200 RPM?
    Could it be some loose gasket? Which one? How to check?
    Intercooler and associated hoses are not leaking. (checked it with pressure tool)
    In the soundfile you can hear something that almost sounds like a short turbo flutter when I step from the gas and quickly accelerate again. Could that be a hint to the issue?
    I dont think I have perfomance drop. If the turbine would scratch at the walls of the turbocharger wouldn't I have a big drop in horsepower?

    I really hope we can find the issue together. Thanks.
    If you need more information about something, please post here !
    Last edited by patzii123; 12-07-2018 at 08:57 AM.
     
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  2. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Possibly an exhaust gas recirculation connection gasket leak, I can’t get your audio file to work.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  3. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Quote Originally Posted by Crasher View Post
    Possibly an exhaust gas recirculation connection gasket leak, I can’t get your audio file to work.
    Here's an youtube video !
    https://www.youtube.com/watch?v=ggXeGSQA4yg

    I hope you can get that to work.
    Last edited by patzii123; 12-07-2018 at 08:54 AM.
     
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  4. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Quote Originally Posted by patzii123 View Post
    Here's an alternative download.
    Zippyshare.com - Soundfile_Turbo.mp3

    I hope you can get that to work.

    That site looks very dodgy to me. I would be very careful about following the link...

    MF.
    2016 A6 Saloon BE Ultra S tronic - Floret Silver, Tech Pack Advanced, Parking Pack Advanced, Heated F+R Seats & Wheel, Electric Seats, Matrix LED, Ambient Lighting, Speed Limit Display, Twin Spoke 20", Folding Memory Mirrors.
     
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  5. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Quote Originally Posted by MFGF View Post
    That site looks very dodgy to me. I would be very careful about following the link...

    MF.
    What?
    Zippyshare is just a regular and much used filehoster.
    I dont want to put malware on peoples pc's - i want a solution to the issue of my car haha..
    You dont even have to download the mp3 - the play button is already on there !
     
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  6. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Quote Originally Posted by patzii123 View Post
    What?
    You dont even have to download the mp3 - the play button is already on there !
    That's what I did. When I pressed the play button my browser redirected to a new full-screen window with a very suspect looking dialog supposedly trying to force me to upgrade to a new version of Firefox. It was impossible to exit the page normally - I had to kill the process for the browser and clear my cache (the page kept re-appearing when launching the browser again). It wasn't a regular upgrade dialog you'd normally see, and I'm on the latest version already. I won't be going back to that site again. It might be legit, but it didn't look that way to me. Just wanted to warn others...

    MF.
    2016 A6 Saloon BE Ultra S tronic - Floret Silver, Tech Pack Advanced, Parking Pack Advanced, Heated F+R Seats & Wheel, Electric Seats, Matrix LED, Ambient Lighting, Speed Limit Display, Twin Spoke 20", Folding Memory Mirrors.
     
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  7. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Quote Originally Posted by MFGF View Post
    That's what I did. When I pressed the play button my browser redirected to a new full-screen window with a very suspect looking dialog supposedly trying to force me to upgrade to a new version of Firefox. It was impossible to exit the page normally - I had to kill the process for the browser and clear my cache (the page kept re-appearing when launching the browser again). It wasn't a regular upgrade dialog you'd normally see, and I'm on the latest version already. I won't be going back to that site again. It might be legit, but it didn't look that way to me. Just wanted to warn others...

    MF.
    In that case I would recommend you to install Adblock Plus in your browser - blocks ads and pop up windows.

    I edited the link to a youtube video now. You can watch it here -
    Weird Turbo Sound - A4 2.0 TFSI CDNB - YouTube
     
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  8. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
    #8
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    Well that's 4 minutes 21 seconds of my life I won't get back!
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  9. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
    #9
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    Quote Originally Posted by Crasher View Post
    Well that's 4 minutes 21 seconds of my life I won't get back!
    Well.. what the hell did you expect?
    Many thanks for the helpful post, really appreciate it.

    Today I checked the turbine with an endoscope because there's a 90 degree turn right before it.
    If somebody still wants to help - check out these images: https://imgur.com/a/imOIIMA
    Looks like I can check the turbine off the list, right? I dont see any traces or anything.
     
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  10. Re: Very weird turbo noises #with audio# - 2.0 TFSI CDNB 
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    Quote Originally Posted by patzii123 View Post
    Well.. what the hell did you expect?
    I expected to be able to here something, all I could hear was background noise and the wind.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
    0 0 0
     

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