[kepone]

i only have one thing to add here ( there is plenty that is unsaid, but i dotn feel like typing it all )

there are 2 different designs of turbos, not one.. there is your typical turbo, and the ball bearing turbo. and a true ball bearing turbo has superior response to any supercharger, the ability to reach maximum boost ( anything from 15-50 psi depending on the engine and the size of the ball bearing turbo ) before 1800 rpm..

an example of this is the incon systems turbo.

there is a lot that hasnt been said on boost vs compression and thermal/volumetric efficiency, and the use of intercoolers etc etc.. but ill put that up another day..