Re: twin turbos?

[PDQSHIP@aol.com]

In a message dated 96-06-05 12:16:22 EDT, you write:

>
>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?

Well the problem is one of two sized turbos becuz you have that 2 and 3 thing
going....  A lot of problems doing this, especially since the space in the
turbine section is a little tight to sequence anyhow.....  Might want to look
at the Lancia Rally car concept, it has more validity to the audi than a twin
turbo would.....
>
>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?
>

2&3 theory is prolly the biggest prollum.....  And engineering nigtmare if
there could be one....

Scott