S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

I did STFA (on2 websites even), so your insight would be appreciated. Grinding sound sometimes???

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Old Aug 28, 2003 | 08:29 PM
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WeißeWagen's Avatar
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Default I did STFA (on2 websites even), so your insight would be appreciated. Grinding sound sometimes???

First, I did STFA but all the grinding noise posts were a little different. Ok, so I just replaced the TBB about a week ago as there was a tear in it. I was driving with the stock chip for a while b/c when I first experienced the loss of boost I took the chip out.

Well, I put the X-chip back in and when I accelerate there is a metallic, grinding type sound heard at around .50 - .60 bar of pressure as I accelerated from 1st or 2nd gear--did not happen any other times. So I swapped the stock chip back in and drove it but there was no sound when I accelerated in the same way.

Was I possibly hearing pinging or something? Has anyone else experienced this. Thanks in advance.
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Old Aug 28, 2003 | 09:23 PM
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Default some people have experinced the wastegate actuator rod making odd sounds. bad turbo would be more

constant. keep on STFAin'
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Old Aug 28, 2003 | 09:27 PM
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Any idea why the sound happens when chipped only?
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Old Aug 28, 2003 | 10:11 PM
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wastegate may be opening more frequently, I never had it happen so I cant give much advice
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Old Aug 28, 2003 | 10:36 PM
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Default does it sound like this?

<ul><li><a href="https://forums.audiworld.com/s4/msgs/1253749.phtml">https://forums.audiworld.com/s4/msgs/1253749.phtml</a</li></ul>
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Old Aug 29, 2003 | 04:39 AM
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Default I had a similair sound when I first bought the car...

It sounded like a metallic ringing sound. I was completely stock at the time and I had my tech ride in the car with me and he claimed that it was the turbos spooling up. (No way...) Then I had an accident and I needed front-end work. Next thing I know the sound is gone and hasn't come back since! (knocks on very large piece of wood....) But like the others have said, I think it had something to do with the wastegate opening and closing as it only happened under hard acceleration.
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Old Aug 29, 2003 | 07:04 AM
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Default I read a while back that...

... some owners had a sandblaster type effect when chipping.

They replaced the exhaust with a more free flowing one and it went away.

-aurf
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Old Aug 29, 2003 | 08:25 AM
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Thanks for the input guys.
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Old Aug 29, 2003 | 08:30 AM
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Default Re: does it sound like this?

Thanks for the clip Funkadelic. Unfortunately I am at work now and my computer does not have speakers, but I'll check when I get home. One of your other clips has helped me in the past too (the waterpump). BTW, really nice car...I'm your So. Cal twin (except mine's making this stupid noise I guess).
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