My belt recently snapped on my supercharged GSR and I had to drive it home without the blower belt. When I turned it off, and started it back up, it made a loud squeeling sound. I replaced the JRSC belt and properly tensioned it. It still squeels loud when I start it. So I took of the belt and started it without the belt again, and it still squeels at first, then stops while running. Then it squeels again when I shut off the engine. What do you think is wrong with the supercharger? I noticed that there was always grease/oil on the intake manifold, maybe from the supercharger??

 

I have had a belt snap and drove without the JRSC for a day before replacing it and have never had the problem your having. Sounds bad. Good luck!