My supercharged Audi A4 2.8 12V has ratteling noise at idle. The noise comes from the backside of the supercharger. See the video-link... Is it normal for a twinscrew-charger??? I´m the only one here in bavaria with a supercharged 12V. The car has a very good performance. The only negativ is the noise at idle!

Greetings from bavaria

Heimwerkerking<ul><li><a href="http://www.youtube.com/watch?v=iS2bwgi6GlE">Supercharged Audi A4 2.8 12V</a></li></ul>

If it is, why the noise disapears when the rpm is over 1000??<ul><li><a href="http://www.kennebell.net/techinfo/ford-techinfo/Lightning54only/GearNoise.pdf">Gearnoise</a></li></ul>

In any case, it sounds like trouble.