Miata Mailing List: May 1997, Message #81
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From: 	"john_k..." <kresky@erols.com>

Subject: Re: superchargers

Date: 	Thu, 1 May 1997 12:21:10 -0500







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> From: Koping Hu <kopingh@ilx.com>

> I just finished flipping thru "Supercharged Performance" mag.  It is from



> Hot Rod magazine so obviously it is more for US hotrods than imports, but



> nonetheless it has nice articles.  I'm just wondering why aren't there

any 

> supercharger kits using centrifugal compressors like Paxton or Vortech

for 

> the Miata?  

> 





I think the reason that they are not used is because of design

considerations. Centrifugal compressors are typically designed to run at

maximum efficiency over a rather small rpm range. There are better suited

for turbo charger applications where the turbo rpm will remain in the

proper range (once the boost comes up) and the actual boost will be a

function of the air flow through the engine which will in turn be dependent

upon the engine rpm. In the turbo application, the engine rpm and the turbo

rpm are not 1 to 1 related as they are in a super charger (ie. a fixed

engine rpm gives a specific SC rpm).



   John K...   

                   Miata CA 63076  '97 / Montego Blue / Lth / "PT"

                   BMW CCA 132462  '96 328iS / sport / M Tech /