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twin turbos?

In thinking about the physics of turbines and looking
at the ways various makers have gotten around some of
the problems, I wonder if anyone has tried a twin
turbo setup on an Audi?

Mazda uses a sequential setup on the RX7. The small
turbo spools up quickly to provide HP down at lower
exhaust pressures while the big one will kick in at
greater exhaust pressures. I believe that both actually
work at higher pressures.

Other than space (and budget) limitations, control
complexity, etc., is there any fundamental reason why
this approach hasn't been developed for Audis?

steve powers ... '95.5 S6 ... '95 620RX/C ... '91 K100RS-16V ... '88 R100S
spowers@spdg.com * stratos product development group * seattle, washington

"I must tell you that these are strong Bavarian beer-carrying horses, not
 the smaller ones of Italy." (Ferdinand Piech)