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Posted for "terrence o'neill" <troneill@charter.net>:
George,
Thanks. I think I understand. If the rpm is relatively constant, and
the power varied mainly by manifold pressure, then the wheel is working
against the throttle backplate at low manifold pressure and realtively high
crank rpm.
Has anyone tried mechanically linking the throttle to a variable
wastegate on the manifold between supercharger and carburetor?
I was thinking that this way possibly the more-opened-up wastegate could
let the pressure blow off when the throttle was pulled back, and increase the
blow-off level as the throttle was opened.
Terrence
Terrence,
If you are not able to control the speed of the compressor wheel - - then you
have to figure out some other way to regulate the output pressure.
All other ways besides speed control introduce substantial inefficiencies.
The beauty of the exhaust gas turbine driven compressor wheel is that the use
of the pressure controlled feed back waste gate control to by-pass the
exhaust around the turbine wheel provides an automatic optimization of the
speed of the compressor to match it to the needs of the engine for manifold
pressure.
It becomes a nice "closed loop" and automatic control system for the
compressor.
Regards, George
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