Hey I have a 2000 ford lightning and i recently changed the crankshaft pulley to add 6lbs of boost. Around the same timeframe i noticed my supercharger starting to make a light rattling/grinding noise that comes and goes. I am not familiar with chargers that much and dont know if that is normal or if it something i should be worring about. any advice?

 

When does it make the noise? At idle, under boost, etc?