Boost is the only replacement for displacement, and that's reaching. Boost = more displacement. Displacement is a measurement of how much atomized fuel air mixture that can fit in an engine. When you double that, you double the displacement. At sea level 14.7 psi atmos pressure. A 4.0 will develop 190 hp. At 14.7 psi boost, 380hp. This is a rule of thumb though, you can get way higher #s from the same boost through inter cooling/water ethanol injection etc etc. there is NO lag when turbo matched for the application correctly. A teeeeeny turbo spools CRAZY fast. Think a small Chrysler 2.2. Put that on a 4.0 the exhaust coming out would spool so quick you'd think it was nitrous. That is not the reason I'd choose supercharging over turbo. The ONLY reason to do a supercharger is... Placement. The turbo would be placed LOW on the engine making it susceptible to branches, mud, objects. Not good for wheeling. Pop a hose in the mud, bye bye motor. Just a small amount of info on boost.
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