The SC IC pump will in all probability not work at any point. Its spindle may be turning but the impeller will be broken into pieces and no longer attached to the motor spindle. The lack of power is due to the SC clutch not engaging due to the overly high temperature of the IC due to the lack of cooling.
The new Bosch IC pumps, with the part number 0392022010, have as yet not had problems.

 

Guys I don't think it's my ic pump, the vehicle ran great even at wide open throttle with my stock pulley just a week ago with supercharger working perfectly, I do have a replacement johnson pump for it on the shelf, but that is not it, maybe it's just the fact that the power increase from the sc pulley is making my tires break loose even more lol but it just feels different, my slk32 currently has the tcu tune from EC, the SL55 amg intake with k&n filters, and now the 65mm pulley:

1. are you guys all replacing your drive belt at the same time you replace pulley, anyone has slippage problems after smaller pulley upgrade but not replacing belt?

2. do you guys notice a change in how the traction control light flashes easily after the smaller pulley upgrade, with traction control off? even under moderate acceleration? i understand this could be due to the power increase and my tires just breaking loose easier, but would make me feel better if you guys have the same thing? I can always upgrade my tires to stick better with the additional hp/tq.

3. Does the ecu tuning help with the pulley upgrade? meaning overall smoothness and response, these engines run so nice and smooth, and now mine feels like it's just quite not right.

I am trying to determine if my pulley is still an issue, or if I should move on, i still have a sl55 fuel pump to install, and then my EC ecu tune. Can a couple of you guys tell me what your actual gap is on your supercharger pulley?

 

Guys I figured it out, for those experiencing the same issues here is what I did.

I started over, put the stock pulley back on with the three original shims, checked the gap as I know it worked just fine, guess what, NO GAP, pulley not binding, spinning freeley, but no gap at all, not that I could tell or measure with a gap gauge anyway, so I pulled the stock pulley off, put the new one on with the same three shims, and no go, pulley was binding, so I added the one extra shim i got from eurocharged, and no more binding, so I put everything back and all is good, slk hauls ***, supercharger engages properly now. What's weird is that's what i did in the first place and had issues, maybe the pulley needed to run on the vehicle first and get some tension put on it, been driving it all weekend and all is good so far.

bottom line no measurable gap, just enough to spin pulley by hand and not have it bind worked for me.