The turbo also has parasitic losses. The exhaust has to be pumped through
the turbine. They both have pros and cons. Supercharger advantages include
boost there all the time and consistent with engine rpm, does not lag. Also
exhaust heat does not get transferred into the incoming air. A Downside is
they take up room and need to be positioned so engine can drive it.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Rob
Sent: Friday, July 08, 2011 3:17 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Superchargers?

I've often wondered about the 'why' with a supercharger.
The supercharger takes horsepower off the front end (parasitic) to operate
and a turbocharger gets it's power from the engine waste. I can see why the
supercharger was used on the Pratt & Whitney R1820 but on an engine with a
(relatively) easy to tap exhaust stream why use a supercharger?
Just wondering ...

Rob
becida@comcast.net

At  7/6/2011 08:13 AM, Don Hanson wrote:
>   Anyone have any experience with superchargers on a VW?
>Turbochargers get all the ink..everyone talks about Turbo Subies and Bostig
transplants.