thanks Guys

I went back to my turbo mate and challenged him with your comments Dave.
His response was pretty good.

He said doesnt matter what people say will work, I was referring to inefficiency. He then said its easy to prove, an engine has a max CFM which you can then plot against a compressor map.

We calc'd it using something along the lines of
CFM = RPM x CID/3456 divided by VE

(was last night over the phone so cant remember the exact numbers)
I do remember we used 1.4 liter engine @ 7000rpm and around 80% effiency

That resulted in around 250 CFM

he then plotted on a GT2560R, 60 comp ar and .6 rear

looked like this




I then sent through some of the dyno pics from other turbo A series off the site.

What do you know, if you look at them for about the first 4000 RPM there graphs are almost like a non turbo, then BAM