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I plan to build the engine, as in aftermarket pistons/rods/head studs/etc.
By CR I mean compression ratio. Since I am building the engine, I can spec the compression ratio I want. The TS3 uses a 9:1 CR as far as I know. With the Vortech, I wanted to take advantage of a higher CR, if I could, and see what that CR would provide me. It seems that even with a higher CR and more boost, it won't be much faster (if at all) than a TS3-like setup (14-15 psi, 9:1 CR). I knew a high compression Vortech would make less power down low, but I was surprised how much, and how it would likely not be faster even with extra top end.
FWIW, the new S55 in the M3/M4 has a 10.2 CR and runs over 18 psi stock. Aftermarket tunes take it higher. There are supercharger kits out for the S54 (11.5 CR) that run 12 psi of boost at a much greater flow (so aftercooling is less effective).
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