The RB25 made full boost by 4000rpm which was great for barbagallo long track but as soon as I go short track or enter rally sprint events (very tight course) the lag really slowed me down.
Also did a quick calc based on the real GT3076R RB30DET setup like al's and cubes; 3L, 7000rpm, VE 92%, Boost: 18psi gives a pressure ratio of 2.2 and 53lb/min air flow (see no corrections air temp etc are made here) plots to the right side of the 65% efficiency range but these guys are making ~330rwkw happy power