I think I have a solution for some of you that want to use a turbo setup.
I just return from schooling for Cummins diesel latest 2002 engines, I also
work for Cummins and hold A&P ticket.  Our latest turbo's from Holset are
called the VGT for Variable Geometry Turbo, this turbo does not require a
waste gate and is capable of producing 30 p.s.i of boost at idle which is
close to 60 in.of hg.. It has a VGT controller that is controlled by the
ECM which sense the boost pressure and delta P sensor for the EGR to
function at all conditions, we can eliminate the EGR portion.   I observed
on one test running the engine at idle with a turbo speed of 32,000 rpm and
adjusting the VGT to a turbo speed of 121,000 rpm at idle, and you could
watch the charge air coolers hoses expand from the boost increase.  this
turbo that come in the Dodge available next year and being use now in light
trucks, it  uses a electrical actuator for the VGT,  maybe with a boost
sensor installed in the intake and the EC2 I keep reading about to control
the boost, it can be kept at whatever boost you need or want constant from
idle to max power. One other plus is the turbo is water cooled and small,
and turbos on diesel are pretty much run at 100% duty cycles at all times
on the road.  This turbo is also use in the natural gas engine that run
exh. temp even higher then what the rotary produces.  Well just an idea so
far.....

John