For anyone that wants to calculate efficiencies on their own, here are the compressor maps:
http://www.lysholm.us/pdf/diagram_lys1600ax.pdf
http://www.vortechsuperchargers.com/...i-trim_map.pdf
To calculate CFM, you can use this link:
http://www.mk5cortinaestate.co.uk/calculator3.php
Pressure ratio (the vertical axis) = [(ambient air pressure + boost pressure) / (ambient air pressure)]... or (1 + ambient air pressure / boost pressure). I used 14.7 psi for the ambient air pressure.
To help out, here are a few data points:
Lysholm
(rpm): PR / CFM / m^3/min
3k rpm: 1.81 / 287 / 8.2
4k rpm: 1.91 / 404 / 11.5
5k rpm: 1.95 / 516 / 14.6
6k rpm: 1.97 / 624 / 17.7
6.8k rpm: 1.99 / 714 / 20.2
Vortech
(rpm): PR / CFM
3k rpm: 1.15 / 182
4k rpm: 1.30 / 275
5k rpm: 1.53 / 390
6k rpm: 1.79 / 568
6.8k rpm: 2.05 / 739