In Reply to: Re: All "compressors" make heat... posted by Shawn Fogg on April 05, 1999 at 11:22:13:
No question that a turbo adds more heat than a supercharger but thinking a supercharger dosen't is just putting your head in the sand (some people DO make this claim and it's just not true).
I have seen a book at Barns & Noble on superchargers (I don't remember the name...) and it talks about the differences between supercharger design (a little, the book is mostly for people doing drag racing with big Detroit iron...). The lycolm (spelling) design (AutoRotor) was made for fixed RPM engines and considered very expensive but proven to be more thermaly efficant than the popular (common) "roots" design. Interesting to read.
I know I am talking about a temrature difference of about 10 to 20 degrees but as you said 11 degrees can make quite a difference.
I did get my chip from Garrett. You know the tack only goes to 7000 and the first time I spun up the car I scared myself and shifted BEFORE his imposed 7000 limit! I should get the car on the track this week so I will make a better determination there.