Changing boost with a smaller crank pulley

[juan]

As above, im wondering if anyone knows much about changing boost by varying the size of the crank pulley?

Is this a stupid idea? are there any problems i might encounter? (I know it will affect how fast the alternator spins but the alternator pulley could be changed accordingly)

[hayesey]

reducing the crank pulley will decrease the rpm of the charger.  I believe the PSD toothed belt kits actually include a slightly larger than stock crank pulley which combined with the charger pulley they supplied gives the equivalent rpm as having a stock crank pulley size and 65mm charger pulley.  I believe the reason for this is that making the toothed charger pulley any smaller would mean not enough teeth on the belt mesh.

what are you trying to achieve? 

[juan]

Its for the pulley system on the eaton, as i was thinking of doing a two part pulley but it turns out this would require a fair bit of work

I think ive realised what to do now, but thanks for the info