where as centrifugal while it is constantly creating boost all the same it will lag if you jump on it..
I tend to disagree with this part of your statement... Proper tuning and pulley ratios play a huge role in having a centrifugal perform properly. I would bet comparable PD blower to comparable Centrifugal blower would yield similar results. Where you start to gain an advantage with the centrifugal is in the effeciancy. Centrifugal compressors are notoriously more efficient at moving air than a positive displacement blower. This means then can move a similar amount of air with out heating that air to the same point as a comparable PD blower. The centrifugal blowers will still make plenty of torque down low and have very linear hp curves, I personally prefer
Vortech when it comes to blowers and have used their products without incident for a countless number of years on just about every car I own/ have owned.
Here is the dyno graph from my S550 with a JT trim. Car makes 11lbs of boost and has no other mods with the exception of ID1000 fuel injectors, Boost a Pump and
Magnaflow Catback exhaust. The car makes a ton of torque right of the hit and makes power all the way to 7200 rpms. Our first trip out to the track in this car at over 4,000lbs yielded results of 10.98@131 with more on tap for next year.
Compare this to the stock dyno graph:
FWIW, if you look at small tire racing these days you will find nearly every car out there running Nitrous, Turbo or a Centrifugal blower. You don't start to see the screw blowers and Helix blowers until car are making in excess of 3,000 hp where the compressors on a centrifugal simply can't keep up with a screw at the 50+ lbs of boost level. There is something in the works as far as a Promod Centrifugal but that is likely a year or two away to support over 3,000 hp.