[s-cars] Sequential Turbocharging

[Richard Tanimura]

A mechanic friend who does Porsches built what I think might be just as
interesting. He had a sequential blower and turbo. The
blower/compressor/supercharger gives him a lot of grunt at low RPMs.
Probably more than and further down than a small turbo can give. He has
built a mechanical control somewhat like a heart valve. When the pressure
from the turbo exceeds the pressure from the blower, the valve switches over
and the blower cuts out.

You could use a very small turbo in the first stage but the parasitic losses
caused by pushing gas through a small restrictor (hotside of the first
turbo) would be a negative factor for getting real push out of the second
stage. Both ideas are fun. Looking forward to seeing somebody try some
solutions.

Richard


On 1/6/06, Dave Forgie <forgied at direct.ca> wrote:
>
> Steve:  I think I saw the BMW sequential turbo thing on Top Gear.  I was
> also thinking about this and how Toyota did that with the early 1990's
> Supra.  I think one of the problems that would have to be over come is
> getting space to locate the two turbos with out one of them being too
> close to something that burns.  Maybe something small like a K04 for the
> lead turbo and something bigger like a K27 (26??) for the upper end.
> Software would be the second challenge.
>
> Dave F.
>
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