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View Full Version : Question Very weird turbo noises #with audio# - 2.0 TFSI CDNB


patzii123
09-07-2018, 10:46 PM
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 (https://www.youtube.com/watch?v=ggXeGSQA4yg)

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 !
Crasher
10-07-2018, 09:03 PM
Possibly an exhaust gas recirculation connection gasket leak, I can’t get your audio file to work.
patzii123
11-07-2018, 08:32 AM
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 (https://www89.zippyshare.com/v/zPoeJgMx/file.html)

I hope you can get that to work.
MFGF
11-07-2018, 10:45 AM
Here's an alternative download.
Zippyshare.com - Soundfile_Turbo.mp3 (https://www89.zippyshare.com/v/zPoeJgMx/file.html)

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.
patzii123
11-07-2018, 10:57 AM
That site looks very dodgy to me. I would be very careful about following the link...

MF.
What? :D
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 !
MFGF
12-07-2018, 08:43 AM
What? :D
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.
patzii123
12-07-2018, 08:55 AM
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 (https://www.youtube.com/watch?v=ggXeGSQA4yg)
Crasher
12-07-2018, 09:32 AM
Well that's 4 minutes 21 seconds of my life I won't get back!
patzii123
13-07-2018, 08:05 AM
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.
Crasher
13-07-2018, 01:22 PM
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.
FrenchAudi
13-07-2018, 03:04 PM
I expected to be able to here something, all I could hear was background noise and the wind.

That's all I heard too.

And I was down for half an hour sorting out the hijacking of my browser by what seemed to be malware. I had to reset thre times before I found a way around it.

AND I don't like being told to install something to avoid a problem with a link someone has posted.