My thinking was this - with a supercharger (or a turbo, for that matter), you are essentially fooling the engine into thinking it's bigger than it really is, all the time (not like a turbo). I forget which type of SC is which, but whichever one runs constant boost (Eaton?) would give you added power throughout the rev range, with essentially the same power and torque peaks, with the same driveability and smoothness that the sr20 engine is noted for. Plus, you'd still get to take advantage of other mods like headers, useless with a turbo, and cams, which from what I've read on this board and elsewhere depending on the grind don't do much for turbo applications.
I think a supercharger, ideally integrated with the intake manifold, and probably driven via a rod across the front of the block (ala the Vortech unit), at maybe 6-8 lbs of boost, would give significant horsepower gains without sacrificing driveability or reliability. Lack of turbo lag, for me, is a real plus; I don't drag, but I really enjoy the twisties
and have long been interested in autocross and want to try it out when I can get together the money and the intestinal fortitude...
As far as integrating the SC with the intake manifold, this might be more feasible for the 93-94 and up engines with the plenum higher in the engine bay. I wonder if Bog Boost and his custom intake manifolds is watching this thread?
Unfortunately I am currently without income (thanking my lucky stars that my wife has a job and we're not in any trouble) and am not able to pursue this idea. I'm sort of testing the waters; any takers? 2002G20Sport?