Originally Posted by Itsmeagain
But surely a 400bhp capable T34 is capable of that 400bhp on a 2litre or a 10litre, itd be at lower revs when it maxes it out on the 10litre, but itd max it out all the same.
No, the turbocharger flows depending on the pressure. Too high of a pressure can either mean more air flow or less air flow, depending on the compressor efficiency map.
Now, the engine must be able to draw enough air in to make the power. A smaller engine will need more psi to make the same power than the larger engine with the same turbocharger, but it could even make less power as higher psi usually leads to hotter air.