From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Re: supershargers
To: lml
Date: Tue, 15 Mar 2005 20:08:26 -0500
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 <002401c529b6$da64c130$6501a8c0@axs>
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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