procharger question

Does any one know were i can find the math eqation to pully ratio to boost. I have the p600b head unit that putts out 6psi of boost but i dont know what size the pully is. Any ideas on what pully size would make what boost. thanks.

You wont get an exact answer on that. Pulley size will give you the impeller rpm. But you have to take that number and a good "swag" to figure out about what it should be for your motor. CI, VE, head/intake flow capabilities, ect ect will determine your amount of boost with a given amount of air.

ic yeah thats what i was reading. thanks any ways.

ok well what about a genneral thing, like does the bigger one make more boost or the smaller one. i found a 2.67 and a 3.33. and do u think that one of those would be to much boost.

The smaller the pulley diameter the higher the impeller rpms. As far as too much that would depends on what size crank pulley you have as well as what is the stock blower pulley size?