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Thanks for the interest guys, feedback is welcome and desired.
To rebut a couple of things. I take your point that roots superchargers are getting better efficiency wise, but the supercharger I am useing is an SC14 supercharger from a 2L toyota straight six. It's capabilities are well known, and I can assure you that the effiency drops with the combinatino of high boost and high rpm. So I reason that my relatively high boost requirement of 12psi balanced out with my low rpm expctation will keep me in a range where an acceptable level of heat is generated. remeber I am not intercooling the second stage (post supercharger) so have to be very carefull with outlet temps here.
Whilst roots superchargers are gerat and give excellent results, and new ones are improving, there will ultimately be a compromise to make when searching for 350hp out of a Alfa 2l motor. To size it suitably, I'd end up with a higher power draw from the charger, and a choice to be made about where the best efficency should lie....with this setup, I have two efficiency isalnds to take advantage of...meaning...hopefully an improved efficeny zone over all. It will improve fuel effiency....and hey, lets face it....I want a challenge and it will be that in spades.....I also LOVE turbos :-)
I did consider boosting the turbo, there are a number of reasons that I did not do it this way, mainly packaging. It will work just fine the way I have laid it out and there is no additional complexity with respect to the valving.
Cheers
Mike
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