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Re: twin turbos?

Remember the Lancia Rally car back in the 80's in Europe, supercharged 
and turbocharged. Supercharger for low rpm and the turbocharger kick in 
at higher rpm.

Anthony Chan, First Hill, Seattle, WA, USA.
92' 100 V6 Tornado Red.

On Fri, 7 Jun 1996, Linus D. Toy wrote:

> Date: Fri, 7 Jun 1996 03:48:52 -0400
> From: Linus D. Toy <linust@interramp.com>
> To: quattro@coimbra.ans.net
> Subject: Re: twin turbos?
> Next time any of you go to a major boat show, or go by a marine engine
> supplier, check out the Volvo supercharged/turbocharged diesels.  I don't
> recall all the details, but they have it set up sequentially, to get low end
> torque as well as high end power.  If I remember correctly, they run SC only
> down low, have a transition where both SC and Turbo run together, then close
> off the SC after a certain point.  Granted, this is much easier with a diesel.
> --ldt
> At 12:58 AM 6/6/96 -0500, Jeremy R King wrote:
> >On Wed, 5 Jun 1996, Graydon D. Stuckey wrote:
> >> On Wed, 5 Jun 1996 ptimmerm@mashtun.JPL.NASA.GOV wrote:
> >> > Turbo Scott said wrt twn turbos....
> >> >   [snip]
> >> > If I read him right, he is implying that the addition of a
> >> > supercharger to the existing turbo system would be a better
> >> > idea.  With other massive turbo apps like tractor pull rigs
> >> > or hydroplanes, they run sequential with cooling at each
> >> > stage.  So you compress, cool, compress again, cool again,
> >> > then run it into the motor.  How about a g60 front ending
> >
> >   [more snipped]
> >
> >I agree with your statements about the sequential setup.  I'm curious
> >about how you would run a parallel system.  Would you have the
> >supercharger feed the motor and all the exhaust go to the turbine to spool
> >it up with the compressor dumping to the atmosphere.  Then switch to the
> >compressor feeding the motor with the same exhaust setup (except that the
> >compressor now feeds to the motor)?  I say "motor" in the southern sense
> >that it actually means "engine".  It wouldn't make sense to run the super
> >and dump the exhaust to the atmosphere (via muffler) and then switch over
> >to a turbo system.  Then there would still be spool-up time.  Seems to me
> >all the control would be in the intake manifold.  Maybe a plenum with two
> >inlets (one from supercharger, other from turbo compressor) that were each
> >valved.  And maybe a clutch system on the supercharger to limit drag at
> >high rpms.
> ----------------------------------------------------------------------
> * linus toy           email:  linust@interramp.com                   *
> ----------------------------------------------------------------------