255 HP - Yowser!!! (tries to imagine 2250 lb PV with 255 HP - :^D )

Some types of superchargers don't pump as efficiently at low rpms - but I guess those are the more 'centrifugal' types - I guess John's kit is using some sort of positive displacement with very tight tolerances if it pumps full pressure (or even close) at very low rpm's?

Have you seen how the variable CR works on some of the newest Saab engines? In an attempt to solve the peak boost = low CR to avoid detonation -vs.- low throttle = high CR for efficiency and throttle response problem. They split the block between the crank and the cylinders. A hinge is placed along one sode of the block and a computer controlled actuator (or several?) is placed on the other. Under low boost/off throttle conditions the block hinges closed a little so the pistons go higher and a higher CR is obtained. As the boost climbs the hinge opens to lower the CR dynamically. Best of both worlds! (Cost, complexity, longevity, future repair costs, etc disregarded!)

http://www.saab.com/main/GLOBAL/en/vepsilon/