3.8 pully from 4"..will i need to change belt?

i was told by the tech guy at superchargers.com that the 1st gen jrsc used 4in pullies for 5psi..im running the street kit w a 4in pully and powercard and my boost guage is running steady at 5psi....-joep

I believe take 1/2in off the size you have now. Pretty sure that's what I did

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Originally Posted by AttarixEp

I believe take 1/2in off the size you have now. Pretty sure that's what I did

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the pully on my jrsc says 4" on the side..and my boost guage is pegging out at 5psi.

im about to throw my ac pully on my crank an blow the whole thing up lol