Odd Turbo Noise after heavy use
02-26-2019, 09:45 PM
#1
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Odd Turbo Noise after heavy use
Recently my APR stage 1 2005 TT 225 1.8t has been having some turbo sound issues. After pushing the car hard and holding boost for a while, the turbo starts changing in sound. Normally I hear the turbo from the driver side of the car but this noise comes from the passenger side. Not only do i hear the same usual turbo noise, but a rather raspy, louder and hollower sound arrises, like someone is furiously saying "SHHHHHH". I dont feel any loss of power or boost. After cruising for a bit I can push the car hard again with a normal turbo noise for a few minutes before this sound comes up again. I have numerous ideas for what it could be but have never seen anyone with this problem.
Any help would be appreciated!
Thanks,
Neil
Any help would be appreciated!
Thanks,
Neil
03-03-2019, 04:56 PM
#2
Audiworld Junior Member
Recently my APR stage 1 2005 TT 225 1.8t has been having some turbo sound issues. After pushing the car hard and holding boost for a while, the turbo starts changing in sound. Normally I hear the turbo from the driver side of the car but this noise comes from the passenger side. Not only do i hear the same usual turbo noise, but a rather raspy, louder and hollower sound arrises, like someone is furiously saying "SHHHHHH". I dont feel any loss of power or boost. After cruising for a bit I can push the car hard again with a normal turbo noise for a few minutes before this sound comes up again. I have numerous ideas for what it could be but have never seen anyone with this problem.
Any help would be appreciated!
Thanks,
Neil
Any help would be appreciated!
Thanks,
Neil
The only other time I heard that noise was when I first bought my car and the PO had put on a junk cone filter. The increased airflow created the same "shhhhh" sound, to the point where it was almost vacuum-cleaner like and annoyed me so much I had to put the stock airbox back on. I think the noise now is being caused by a very large boost leak but I stil have investigating to do.
Make sure you check all your turbo hoses for leaks. Otherwise it could be the turbo itself, that would require removal to be sure though.
03-05-2019, 05:01 AM
#3
This is a shot in the dark but I would first check your turbo outlet hose for leaks or loose clamps. it is the red one. I had a boost leak there once every after a timing belt replacement on the roadster. No symptoms other than noise. I tightened the clamps and — gone.
And yes, a diverter valve can do this too. It is just not as close to the turbo and therefore not as likely to be affected by heat.
And yes, a diverter valve can do this too. It is just not as close to the turbo and therefore not as likely to be affected by heat.
Last edited by J. Patterson; 03-05-2019 at 05:05 AM.
03-05-2019, 02:35 PM
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Sounds unique to me as well. I'm dealing with some very typical boost leak noises, primarily from what I believe are a bad diverter valve and maybe a torn TIP. I have to say that the noise you are hearing sounds uncannily like mine...
The only other time I heard that noise was when I first bought my car and the PO had put on a junk cone filter. The increased airflow created the same "shhhhh" sound, to the point where it was almost vacuum-cleaner like and annoyed me so much I had to put the stock airbox back on. I think the noise now is being caused by a very large boost leak but I stil have investigating to do.
Make sure you check all your turbo hoses for leaks. Otherwise it could be the turbo itself, that would require removal to be sure though.
The only other time I heard that noise was when I first bought my car and the PO had put on a junk cone filter. The increased airflow created the same "shhhhh" sound, to the point where it was almost vacuum-cleaner like and annoyed me so much I had to put the stock airbox back on. I think the noise now is being caused by a very large boost leak but I stil have investigating to do.
Make sure you check all your turbo hoses for leaks. Otherwise it could be the turbo itself, that would require removal to be sure though.
03-05-2019, 02:36 PM
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This is a shot in the dark but I would first check your turbo outlet hose for leaks or loose clamps. it is the red one. I had a boost leak there once every after a timing belt replacement on the roadster. No symptoms other than noise. I tightened the clamps and — gone.
And yes, a diverter valve can do this too. It is just not as close to the turbo and therefore not as likely to be affected by heat.
And yes, a diverter valve can do this too. It is just not as close to the turbo and therefore not as likely to be affected by heat.
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