i thought about this last night as soon as i shut my computer off, since his measure is in bar he is comparing how the engine acts like a pump.. in which case the comparison is against "optimal" efficiency. (air compressors only operate at one rpm)..


so if you have a firefly, 3 cylinder .9l making 51 kw at 5500 rpm = 12.3 bar all those vtec boys will have metro envy..


plus these are all stock configurations..


just for fun, dahlback racings gti:

2.1l making 527.6 kW @ 5.780 r/min = 52.16 bar...