Sean, it would seem to be a bit low on torque numbers ?
Correct Dave. They are much lower torque than a turbo. Where a turbo will whoosh to its wastegate pressure or setting & then hold it to the rpm limit the charger is making boost relative only to the rpm of the engine. Example it only sees the 12psi at 11000rpm at 10000 it sees 10psi & 8000 it sees 8 etc.
Mapping has to also take into account that at 10% throttle at 10000rpm unlike a turbo its still making 10psi because its rpm related where a turbo would not be generating boost at such low load. This is both good & bad. Good because you have instant pickup but bad because you will consume more fuel to keep it rich n safe under the boost & also inlet temps are increased.
The Procharger & the Rotrex chargers being gearbox driven impellers make the power completely differantly to the turbo. I personally prefer the elastic power band of a turbo however the procharger does have strong merits.
Precise throttle controlled power & boost. More control on cornering under boost as its more predictable. On a circuit or hill climb this combo comes into its own & gives the rider much more usability & feel.
Having ridden this bike the best way to describe it is like riding a 2 litre Busa
