Variable Compression, Variable Displacement you deside

[bruce plecan]

I'd like to hear from a ME type, and know which/why is most
accurate to describe a super/turbocharge engine.  While
compression ratio is a mechanical calculation, and the
engine size doesn't increase due to "boost" the VE does,
so what term most accurately describes what happens to the
engine?.  A rather well known engine builder keeps calling them
variale compression motors, is this accurate?.
  Also what is the limit for VE?.  Seems like a turbo street engine
ala Buick GN gets to 120% rather easily?.
  Would this VE be as easy as using a bar conversion and saing
at 1.5 bar boost it would be 150% VE (turbo apllication),  Yes we
are ignoring intake air heating, but just as a place to start thinking 
about what's going on.
  Something else I'm curious about is once you exceed peak
torque at WOT and are approaching max HP does the pulse
lenght for the injector really need to be much longer?.  Or
since there are more of them per amount of time, things just
kinda work out?. 
Bruce   The guy with the cone shaped hat, and chin strap
            way too tight.