I can suddenly hear my turbo...?

[willssss]

Driving to work this morning, I noticed something that sounded distinctly like a very quiet blow-off valve after letting off the gas around 3-4k rpm. I have never noticed this before and though it sounds cool, I worry it might be signs of a wearing turbo bearing. Is this a reasonable concern or am I being paranoid?

The car is a 2007 A4 2.0T with 90k miles on it. I just gifted myself a cat-back exhaust for xmas. I've had it on for a round 600 miles and have only just now noticed the sound.

Thoughts?

[Jeevan]

we are not witches to help you out here without giving any info or accurate symptoms/codes. your question is very vague. make a video and post it here.

[willssss]

we are not witches to help you out here without giving any info or accurate symptoms/codes. your question is very vague. make a video and post it here.

I tried to record the sound, but it was difficult to hear. Ill plug in the VAGCOM and see what it tells me. The car isn't yelling at me, currently.

[Jeevan]

if you have air compressor at home, test the turbo waste gate arm first.

[Spetznaaz]

Mine makes a slight woosh, like air being released, if i accelerate then quickly lift off the pedal. I assumed it was normal, perhaps not. It may be placebo affect but after i fitted a new diverter valve the other day the woosh sounds seems a bit quieter.

Quite curious what this turns out to be..

[willssss]

if you have air compressor at home, test the turbo waste gate arm first.

I do not have one at home nor do I know anyone with one. Maybe I can rent one...

[Jeevan]

I do not have one at home nor do I know anyone with one. Maybe I can rent one...

dude, you seriously need to find a mechanic. your answer says it all.

[lumberwood]

dude, you seriously need to find a mechanic. your answer says it all.

Easy dude, let's try a more welcoming tone instead. No need to jump down his throat for not having access to an air compressor.

OP, it would be helpful to provide some concrete details about what's going on. Let us know what you find with VAGCOM if anything. If you can pull in a helper, try to get a video of the sound, perhaps from the engine compartment near the turbo itself.

[Jeevan]

Easy dude, let's try a more welcoming tone instead. No need to jump down his throat for not having access to an air compressor.

OP, it would be helpful to provide some concrete details about what's going on. Let us know what you find with VAGCOM if anything. If you can pull in a helper, try to get a video of the sound, perhaps from the engine compartment near the turbo itself.

i told to find mechanic because he said he told that he would rent air compressor. My comment is not harsh by any means. it depends on how you take it.

[Theiceman]

i told to find mechanic because he said he would air compressor. My comment is not harsh by any means. it depends on how you take it.

I kind of feel you were harsh with him since your first post.... The message received is the message sent.
Ease up.

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[Theiceman]

The job of the diverter valve is to take the compressed air between the turbo and the closed throttle body and redivert it back before the turbo.
It is used most when you let off quickly. Check this area closely.

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[Jeevan]

I kind of feel you were harsh with him since your first post.... The message received is the message sent.
Ease up.

Sent from my SM-G973W using Audizine mobile app

you are right, my apologies :)

[gavin_j]

I'm going to agree with theiceman.
The diverter valve has a rubber boot that tears(suddenly even). Driven mildly, that may not even throw the MIL right away. This problem can definitely reflect your symptom.

This job can be done with minimal tools and small hands if you're willing. There should be lots of DIYs around as it's a very very common issue.

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[Spetznaaz]

With regards to the above ^ Should there be a slight woosh with a brand new dv? I'm starting to wonder if i somehow managed to do it wrong, if that's even possible.

OP - DV guide: https://www.audizine.com/forum/showt...l-Installation

The electrical harness was a right pain in the backside for me but someone's now posted a video of how to get it off. Also, if you do this and find a way to get a torque wrench on all 3 bolts, please do let me know how as i hate not having bolts torqued to spec.

[Theiceman]

With regards to the above ^ Should there be a slight woosh with a brand new dv? I'm starting to wonder if i somehow managed to do it wrong, if that's even possible.

OP - DV guide: https://www.audizine.com/forum/showt...l-Installation

The electrical harness was a right pain in the backside for me but someone's now posted a video of how to get it off. Also, if you do this and find a way to get a torque wrench on all 3 bolts, please do let me know how as i hate not having bolts torqued to spec.

i would imagine with stock parts it is absolutely silent.. i hear nothing with my car .. but then again i dont have the greatest hearing.
But if you went to an aftermarket upgraded part maybe there could be some sound..

[Spetznaaz]

That is a bit worrying ^, i replaced with the piston style OEM / Pierberg. My original diaphragm one looked in perfect condition as well (75k miles).

[EvolutionArmory]

It’s completely normal to hear a little chirp on occasion with a stock DV and turbo. With my car, K04, stock DV and air box I hear a little chirp on rare occasions. It’s just a little back pressure once and a while in certain low speed conditions.

If you hear your turbo constantly when it’s stock then you have an issue. Most likely a torn DV if it’s the old diaphragm style.

[Jayz691]

That is a bit worrying ^, i replaced with the piston style OEM / Pierberg. My original diaphragm one looked in perfect condition as well (75k miles).

The revised diaphram(rev g) are better, imo and lots of others, than the piston style(rev d). Anyway, was tgere any loss in power when this happened? And have you logged anything?

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[Spetznaaz]

The revised diaphram(rev g) are better, imo and lots of others, than the piston style(rev d). Anyway, was tgere any loss in power when this happened? And have you logged anything?

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Yeah from what i read, the diaphragm is better but much more prone to failure due to the nature of the design. I want to eventually get a DV+ which i read needs the piston style one.

Well i got the car back in May and it's always made the slight woosh. My first turbo car (last car was 110bhp fwd, this is 220bhp awd) so i'm not sure what the power was supposed to be like. Had it scanned a couple times (no vag-com myself yet) and no error codes. After fitting the new DV i felt like the woosh was a bit quieter and the car felt a bit quicker to boost and just more responsive in general however the placebo effect is a powerful thing. Old DV looked pristine mind.

[Jay-Bee]

Yeah from what i read, the diaphragm is better but much more prone to failure due to the nature of the design. I want to eventually get a DV+ which i read needs the piston style one.

GFB DV+ will fit on either DV revision, once you remove the basket/piston/diaphragm setup they are the same solenoid unit.

[willssss]

dude, you seriously need to find a mechanic. your answer says it all.

I live in an apartment, having an air compressor is just not gonna happen.

[willssss]

The job of the diverter valve is to take the compressed air between the turbo and the closed throttle body and redivert it back before the turbo.
It is used most when you let off quickly. Check this area closely.

Sent from my SM-G973W using Audizine mobile app

Ill do this over the weekend. I have the most recent rev diverter valve but have yet to put it on, Boston has been cold.

In the mean time, I've uploaded an audio clip I took with my phone under the hood as close to turbo as I could get it without actually exposing it to too much heat. This is the best I could do on my way home from work, but will try again this weekend. Around the 8-9 second mark is the sound I am hearing: https://soundcloud.com/user-877716035/turbosounds