Miata Mailing List: September 1994, Message #48
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   From: Kevin Graboski 806 1032 
Subject: Re: Additions to turbo/super post
   Date: Fri, 2 Sep 1994 13:14:43 -0400

Harvin A. Sauls emailed me and wrote:

	I think you will find that both superchargers and turbos will require
	higher octane fuel than stock.  Boost is boost no matter how you get it.

To which I respond:

Well I have to agree that boost is boost, but the temperature of the intake
charge is also a factor. The higher the temp the greater the propensity for
pinging/detonation. The Bell system raises the temp of the intake charge 10
degrees over ambient, whereas the Downing system raises it 76 degrees over
ambient. This would imply that the second is more susceptable (sp?) to the
problem. Yes/no/maybe?

	kevin
	kevin@kentek.com