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Originally Posted by sheek360
roots and twinscrews compress differantly, twinscrews compress at the supercharger and roots compress in the intake manifold. ur right about the centis disadvantage on a 8krpm engine. roots and twinscrews boost asap because of the gearing. you cant gear a centi like a roots. number 1 its impossible and 2 theres patent issues. turbos have lag in the begining because, at low rpm, there arent enough exhaust gassses to get it moving, u produce more exhaust gasses at 8krpm vs 3krpm right? a turbos boost isnt as linear than a roots because a turbo isnt rpm dependant. you can only spin a turbo so fast, no matter how hard u try. a roots spin is limited by its pulley size and max rpm. The new eaton tvs blower, coming out in the summer of 07, can spin to 20-22krpm. that means my car, at 7krpm redline, can utelize a 2.2 pulley <total amount of boost is unknown because of the new gearing>. due to that blowers gearing Ill be at a little over 450whp and 4 hundred something wtq. the current roots im running now wont allow me smaller than a 2.5 pulley <about 22-23LB of boost>. IMO, if u need someone to tell u wichone to go for, i say u go aj performance!
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Sheek360, your knowledge of boost is really a great addition to the site, regardless of what you drive.
The twin-screw design sounds great but, unfortunately, I doubt anyone would ever step up and design one for the Civic. I've read that they are more expensive to produce because they must be designed with much closer tolerances so they will properly compress air while a Roots supercharger just "blows" it into the intake (hence, the name "blower).