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Re: Chirping TURBOS-- ANALYSIS

> the Audi 200 Trans-Am has a wide open intake horn that is connected
directly
> to the turbo inlet. Kind of like a speaker megaphone. The A2 Quattros from
> the group B era also could be setup this way with a different air intake
> horn. Without a bypass valve, or even with one and extremely high boost
> levels, the boost charge will blow back through the turbo impeller  (cold
> side) during shifting and this is what causes the chirp chirp chirp sound.
>
  I would like to see this thread expand!  Good info and Ideas.
Also maybe of interest is that a Kawasaki GPZ 750 turbo which I used to own
chirped quite a bit.  As I remember there was only an air filter before the
turbo.
  Dave G
http://www.pelkie.com/mycars.htm