B series engines have journal bearing turbo's which spool up very late. They merely add 20 to 30% more power to the engines original power so there is no real power just a lot of heat under the hood.
I believe whether moving or stationary the engine should produce the same amount of boost.
The reason i say this a moving car with a snorkel on a NA engine has a small factor of forced induction, a NA engine without a snokel has no forced induction. When a turbo is hooked up it uses exhaust gases to spin the turbine. From your post i interpret a staionary engine will produce less exhaust and a moving engine will produce more?
I believe that is not the case, turbo's use exhaust to propel the turbine and the turbine is connected to shaft and the shaft is connected to the compressor. So the speed of the turbine is parallel to the speed of compressor. So lets say we have a turbine and compressor of exactly the same size (most turbo's don't), so this equates to that the amount of exhaust going into the compressor is parallel to the amount of air the compressor is pushing in.
Now when a stationary turbo engine is revving at 2000 revs and is sucking in 70 liters of air per minute, a engine on the move will be sucking 70 liters of air per minute too.
Rotary pumps have mechanical governors opposed to inline one's which have vacuum ones. So you have a boost compensator which operates via pressure for a rotary pump. So when you have a surge from 5 psi to 10 psi the boost compensator will allow more fuel. There is no external factor here which involves more air being pushed into the engine when a engine is moving unless you have a mighty big snorkel and if you do manage to create a vacuum while running a turbo you will have some real serious issues with a engine.
I am a bit rusty on explaining things, but i think you get the idea what i am trying to say here. Maybe you can share your views on this, because i simply cannot understand how a stationary engine will suck in less air than a moving one.
I've had the experience of seeing small diesel turbo gensets running upto 18psi.
And this is not an attack.