[s-cars] What Are These Noises!

[Jim Bonnet]

Matt Moly wrote:

>My recently (2 months ago) chipped 95 S6 has gradually
>gotten more and more vocal since the change. It now
>makes a total of three totally new noises which I am
>sure are familiar to some of you veterans. The first
>one is a kind of metallic whine/crackling noise that
>seems to come from the engine in any gear when ever
>the car is revving from about 1800 to 2200 rpm, and
>only sounds when the engine is accelerating. I don't
>notice any change in the way the power is delivered
>though, it just sounds really bad. The second noise is
>this metallic clanking that sounds only when I upshift
>while pushing the car about 60% or more. It seems to
>be some stress noise that is only produced when the
>engine suddenly has to go from highest power band
>(5000 to 6000 rpm) to beginning of boost (3300). It
>really doesn't seem to affect the way the car
>accelerates, but just sounds like something is wrong
>and might end up really hurting the car later on.
>The last noise is pretty typical, although I don't
>know much about it, so I'm asking just for the sake of
>learning. It's this whoop-whoop-whoop sound that comes
>on whenever I lift off the gas under boost (especially
>from 1st to 2nd, and 2nd to 3rd). I have heard other
>heavily modified Jap cars make this sound before and
>have been told it is the waste gate that makes the
>sound. Is this true? And what is happening that makes
>the noise? Any help on the subject would be GREATLY
>appreciated. Thanks.
>
>
>
Matt-- In your case this last noise is probably a dead turbo-bypass-valve.

Clank while shift maybe tranny mounts or muffler banging on something?

metallic whines while driving? I dont think Id drive it until I figured
out what that is! could be tranny? cv joints? wheel bearings?

Jim