srothfuss said:I'll refer to Dag's knowledge / experience but the Twin Screw shouldn't run out of any steam. The best part about the KB is that the boost is always on 100%. So there is no need to wait for the blower to spool up.... Meaning your leaving the guy next to you in the dust sooner. KB's website talks about shifting around 6,000 RPM but on the street, I can bet that is all you need.
actually the kb does run out of steam around the 57-5800 rpm range. there are some people who have run them as high as 60-6200 rpm. and over that there isnt anyone really. except for the 03-04 cobra guys. but if this is intended for a fox then thats it. like mentioned earlier the kb is a real good street blower and has 450-500 potential with a well planned out combo. anything over and even the 2.2 wont be any good without some kinda fabbed up intercooler. not trying to detur you if you're leaning that way, but it really depends on the individual. i went with the 2.2 and will hopefully have her together soon, my needs were different though. the car i'm building is a fat pig and i need all the torque to get her off the line. not doing any weight reduction. she is what she is. i had a 1.5 on the car first huffing into a stock 302 and it was fun for awhile but it left me wanting more. so bypass the 1.5 if you go the kb route and get the 2.2, you'll be glad you did. sorry for rambling.