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From: king@kestrel.ARPA (Dick King)
Newsgroups: net.auto
Subject: Re: turbos and other superchargers
Message-ID: <5004@kestrel.ARPA>
Date: Thu, 20-Feb-86 02:00:27 EST
Article-I.D.: kestrel.5004
Posted: Thu Feb 20 02:00:27 1986
Date-Received: Fri, 21-Feb-86 05:38:03 EST
Organization: Kestrel Institute, Palo Alto, CA
Lines: 23


   From: cuda@ihuxf.UUCP (Mike Nelson)
   Newsgroups: net.auto
   Date: 14 Feb 86 13:38:15 GMT


   While the comment of instant boost for superchargers in drag racing
	is in all  
   practical purposes correct, the most important reason for using a
	supercharger 
   over turbo is the amount of horse power the units can add.  When was the
   last time you saw a V-8 (approx 600) cubes producing 2800 HP with turbos?
   It is very easy to change the gearing on a supercharger to control
	the boost.   
   How could a turbo user modify the amount of boost in a few minutes?

Well, turbos have "dump servos" or "waste gates" that bypass a
proportion of the exhaust past the turbine that depends on the
compressor's output pressure.  Couldn't the setpoint of the waste gate
be changed much more easily than changing the gear of a supercharger?
Seems to me that it could be changed while the car was running,
continuously variable, by a choke-knob-like adjuster!

-dick