A few times lately whenever I have the car parked overnight then start it up, there is a grinding noise that comes from the supercharger. It does this for a couple minutes then goes away whenever the car warms up some. Anyother time it sounds normal with no grinding or excessive noise. For a car that is all stock with 12K miles I would not be expecting this at all. Is this normal for the Eaton S/Cs on the LSJs, or have any of you all had your superchargers replaced for what I am describing.

 

mine makes noise almost like a chattering noise but still runs the same and boosts normal..i think all superchargers make noise

 

You can expect that from a supercharger .. its only the rotors so dont worry about it .. its no big deal

 

anyone else notice in like 25 degrees or colder you get more boost. Dont flame i know that the air is denser and all. I am see like 13.5 to 14 psi now, I love it. Back on topic, mine makes it too.

 

Do you have the boost bypass mod done ? or anyother mods?

 

nope

 

With the stock tune it should bypass anything over 12.5 psi . Maybe when cold the bypass valve is sticking , or the gauge is wrong .