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Re: Chirping TURBOS-- ANALYSIS
> the Audi 200 Trans-Am has a wide open intake horn that is connected
> 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