Strange noise

2006 AUDI A3
160,000 MILES • 2.0L • 3 CYL • 2WD • MANUAL
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SCOTTTAY
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I have the car listed above tdi sport. When the car has been driven for a bit and is warmed up sometimes under acceleration i get a noise appear. Only way i can describe it is as a whining noise. As you accelerate more the pitch of the noise gets higher and sometimes will totally stop. But when i change gear it starts again when i accelerate. From what I have read it is the turbo, but also been told it could be a bearing of some kind. Any help would be great.
Feb 18, 2019 at 5:59 AM
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SCGRANTURISMO
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Hello,

If the sound you hear sounds like a "swoosh", then all's that is is the sound of the compressed air topping out as you change gears. I have a centrifugal supercharger on my Mustang and it is almost identical to a turbo, the only difference being a turbo spins its compressor wheel with exhaust gas and a supercharger uses the serpentine belt to spin the compressor wheel. You will also get a whine when accelerating from either one these power adders as the compressor wheel rpm's pick up. Want to do something fun? Go to a turbo/supercharger rpm calculator online and see how fast it's compressor wheel spins. The answer might shock you. I hope this helps.

Thanks,
Alex
2CarPros
Feb 18, 2019 at 11:04 AM