Numbers are from my mathematical model which I've been developing/tuning since I first joined the SLK32 clan last June2012.
For fuel - I've based it upon AFR=12
Inlet volume is based up on 90% Volumetric Efficiency (constant irrespective of cfm at this stage) x engine capacity per rev of 3.6L (includes null space at 9:1 CR) x 6000rpm c x temp and pressure - normalised back to atmospheric temp and pressure.

max CFM for SC....There's a little black magic here which I havent quite disected.
I think I've determined we run the IHI 1600 jobbie as opposed to the 2300 one used in the V8's.
I believe 1600 relates to 1600cc per rev. so at 15,000rpm for a 62/155 setup = 9.6m3/min x 35cfm/m3 = 850cfm. so its trying to pump 850 cfm into a motor which is only taking 600 or so = pressure buildup.
The pressure buildup places a back pressure on the SC and hence it doesnt actually deliver the 850 - but it does pressurise the air.
The efficiency/burn at which it can do this tails off from the sweet spot which is about OEM spec of 12500rpm and you start simply generating heat instead of volume.
Check out Boost monkeys traces in an alternate thread.

b22b