Thanks guys, i'll speak to the crew at uni about it, though its not technically my issue

Because its not a positve dispalacment type changing the pulley wont really do. Its also being put on a small engine (600cc, though possibly going down to 500) so not having it at boost untill the last few rpm isnt going to be a useful option. I had though that the use of an external wastegate might work and just to put it on the inlet.

I like the idea of using some kind of valve like a ISCV, and i'm sure someone on the project would be able to do the electronics required. making it optimised to produce the max required boost and leaking off wat isnt used would be the easiest option for us. I think we've got a company willing to give us 2 compressors but much has to be done on the matching side at the moment. Im assuming that a pulse type input for the valve would be needed. Does anyone know of any ISCV specifications for such control? We might be getting an ECU off one of the sposors, i guess this could all be taken care of by the ECU if it is complex enough.

As we're running low boost we wont be using an intercooler though the setup needs to be

Restrictor - throttle - charger - engine

Even if we run as little as 1psi of boost it may prove to be adaqute. The current engine is reduced from 100 to 70ish HP because of the restrictor and so the idea behind supercharging is to negate the effects of the restrictor.

Does anyone know how big a hole you need to loose a significant amount of boost? I cant imagine it needs to be very large.

Keep the ideas coming!

Cheers
JAmes.