Let's not move away from the subject at hand. More over, let's not get agressive on this one.. I don't know you and I just need to make sure we discuss on equal terms. I'm no turbo expert like Rara and RedSVT for instance, but I have a fair share of experience with boost on small engines.
I didn't put my foot in my mouth as I never stated that a turbo didn't waste anything.
We are trying to make you realize that turbo spool-up is NOT dependant on RPM's but on exhaust energy. A large engine with a small turbo can make max boost right off idle. The only thing you need from the engine is enough exhaust "power" to spin the turbo at a speed where it produces boost.
.. Which is why you can drive a turbo engine at very high revs, with the throttle partially closed (like cruising on the highway) and it won't make much boost. On the other hand, when you go to WOT, exhaust energy is very strong even in lower revs. There is an "exhaust pressure" threshold where the turbo will start to make boost.
Make sense?
