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Car sounding like a hoover #1635592
17/09/2019 16:27
17/09/2019 16:27
Joined: Mar 2015
Posts: 233
France
Yann Offline OP
Making a profit
Yann  Offline OP
Making a profit

Joined: Mar 2015
Posts: 233
France
Hi,

I’ve recently noticed that my car is noisy when flooring the throttle, above 2500-3000 RPM (once the turbo starts its magic) and sounds like a hoover. If I release the throttle it’s OK.
I checked all the intake pipes (from the turbo to the airbox, from the airbox to the throttle body), cleaned them, refitted them and tightened them correctly but it still sounds like it’s sucking/releasing air somewhere. Maybe it’s normal but I doubt as I don’t remember hearing this sound before.

What could cause this noise ? I noticed the exhaust tailpipe is perforated by rust on the welding but it’s probably not related.

Thanks

Re: Car sounding like a hoover [Re: Yann] #1635604
18/09/2019 05:06
18/09/2019 05:06
Joined: May 2011
Posts: 2,379
Caston, Norfolk
Blueboyracer Offline
Club member 1435
Blueboyracer  Offline
Club member 1435
Competition Level

Joined: May 2011
Posts: 2,379
Caston, Norfolk
Have you checked the filter in the airbox?
It could be an exhaust leak on the downpipe area too


If you want to talk to me send me an email or use a modern social media channel, links in my profile
Re: Car sounding like a hoover [Re: Yann] #1635608
18/09/2019 10:45
18/09/2019 10:45
Joined: Sep 2007
Posts: 593
Freedom
Master_Mariner Offline
Club member 583
Master_Mariner  Offline
Club member 583
Enjoying the ride

Joined: Sep 2007
Posts: 593
Freedom
Is your car still running the original (plastic) dump valve?

Are the hoses to it/from it all attached tightly? A leak there could cause some noise.

Regards

MM

Re: Car sounding like a hoover [Re: Master_Mariner] #1635660
20/09/2019 12:33
20/09/2019 12:33
Joined: Mar 2015
Posts: 233
France
Yann Offline OP
Making a profit
Yann  Offline OP
Making a profit

Joined: Mar 2015
Posts: 233
France
Originally Posted by BBR
Have you checked the filter in the airbox?
It could be an exhaust leak on the downpipe area too

I didn't check the air filter, will do that next time. Good idea on the downpipe, I removed some nuts few months ago, maybe I messed up with something.
Originally Posted by Master_Mariner
Is your car still running the original (plastic) dump valve?

Are the hoses to it/from it all attached tightly? A leak there could cause some noise.

Regards

MM

Yes, it's the original valve, the hose are tight, one is less tight but it has always been like that.

I was wondering if a faulty dump valve or wastegate could be the cause of the noise ?

Re: Car sounding like a hoover [Re: Yann] #1635781
26/09/2019 14:08
26/09/2019 14:08
Joined: Sep 2007
Posts: 593
Freedom
Master_Mariner Offline
Club member 583
Master_Mariner  Offline
Club member 583
Enjoying the ride

Joined: Sep 2007
Posts: 593
Freedom
Most have upgraded to a metal dump valve - as the plastic one wears out eventually.

Regards

Re: Car sounding like a hoover [Re: Yann] #1635836
30/09/2019 17:30
30/09/2019 17:30
Joined: Mar 2018
Posts: 1
Canada
K
krtek Offline
Newbie
krtek  Offline
Newbie
K

Joined: Mar 2018
Posts: 1
Canada
Mine is doing the same thing, sounds literally like a vaccuum cleaner going around the track. I've noticed it won't hold boost past 17PSI and the acceleration is uneven when past 80% throttle.

Re: Car sounding like a hoover [Re: Yann] #1635862
01/10/2019 05:47
01/10/2019 05:47
Joined: Dec 2005
Posts: 1,672
Didcot - Oxon
RusH Offline
Club Member 1771
RusH  Offline
Club Member 1771
My life on the forum

Joined: Dec 2005
Posts: 1,672
Didcot - Oxon
I’d say it’s more of a ‘moo’ sound when the standard re-circ starts to fail.

Definitely sounds like the oe unit could be failing.


Coupe now sold!
Re: Car sounding like a hoover [Re: Yann] #1635897
01/10/2019 20:27
01/10/2019 20:27
Joined: Mar 2015
Posts: 233
France
Yann Offline OP
Making a profit
Yann  Offline OP
Making a profit

Joined: Mar 2015
Posts: 233
France
I was on a trackday in August and also had the feeling that the car was missing power and constantly making the noise, maybe it’s worth to change the dump valve (that’s the recirc valve, right ?) then...

Last edited by Yann; 01/10/2019 20:28.
Re: Car sounding like a hoover [Re: Yann] #1635919
03/10/2019 11:36
03/10/2019 11:36
Joined: Jan 2006
Posts: 9,880
SW London
suba Offline
Je suis un Coupé
suba  Offline
Je suis un Coupé

Joined: Jan 2006
Posts: 9,880
SW London
If's it's on the original DV then change it anyway as your first thing to check - the rubber diaphragm will be utterly shot by now - that's what causes the 'mooooo' noise and leak.


Rotary fun - 370 bhp per ton. GT30's are small you know?!??!?!?!
Re: Car sounding like a hoover [Re: Yann] #1635941
03/10/2019 18:36
03/10/2019 18:36
Joined: Mar 2015
Posts: 233
France
Yann Offline OP
Making a profit
Yann  Offline OP
Making a profit

Joined: Mar 2015
Posts: 233
France
I tried blowing through it last month when checking the pipes, it wasn’t leaking, at least for a small pressure...

Re: Car sounding like a hoover [Re: Yann] #1636701
06/11/2019 19:19
06/11/2019 19:19
Joined: Mar 2015
Posts: 233
France
Yann Offline OP
Making a profit
Yann  Offline OP
Making a profit

Joined: Mar 2015
Posts: 233
France
I fitted a new dump valve (Febi 102127, original part number 06A 145 710 from VAG, an improvement of the original part number 034 145 710 from VAG that is equivalent to the original Bosch unit in our cars) and it looks like the old one was defective and leaking ; since I have had the car, there was always a "whooshing" when changing gear in boost, whereas it shouldn't. Now it is quiet. The idle was sometimes too high or fluctuating, especially at red lights or stops in town, now it seems to be lower and stable so I will be able to adjust it properly.

I didn't really get the occasion to check if the car was still making a hoover sound above 3000 RPM.

Last edited by Yann; 06/11/2019 19:23.

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