PoneyXpres

I'd like some info about the supercharger on my 2004 SL55.

Is it a roots or screw type?

The supercharger snout pully looks to be a clutch type. Is that what it is? Engages like an A/C clutch is what it may do. If it does, is it possible for it to slip?

Is there torque reduction on shifts?

How is excess boost dealt with?

Anything else you can tell me about the system would be great as well.
Thanks in advance.
John

doltmo

I'm no expert, but I'll take a stab at it. Others please correct me if I'm wrong.

Is it a roots or screw type?
- It's a helical screw type. One screw is metal, the other is some kind of plastic (teflon?). I think there are some cut-away views of the compressor on some of the sales literature.

The supercharger snout pully looks to be a clutch type. Is that what it is? Engages like an A/C clutch is what it may do. If it does, is it possible for it to slip?
- it is an electromagnetic clutch (like the A/C) - controlled by the engine computer. It engages at a certain RPM (I've heard the number 1800 mentioned on other posts). This may cause short "chirp" when the clutch engages as the belt slips until the compressor is up to speed.

Is there torque reduction on shifts?
- huh? I don't understand the question.

How is excess boost dealt with?
- don't know. Do belt-driven superchargers have waste-gates?

PoneyXpres

Thanks for the info.
As far a torque reduction, I want to know if the computer reduces torque to the driveline when gear shifts happen.