My Megasquirt experience is with a V6 motor and there may be some differences. My 3L motor has a plenum and throttle body from a 2.5. The plenum has been modified for better air flow but the butterfly is stock. The original 2.5 motor made a little less than 160 HP and my motor with the same throttle body makes a little over 250 HP, so I don't think the throttle body is a limiting factor. You can always get more fuel by installing bigger injectors but I have yet to hear of anyone successfully controlling bigger injectors with an L-Jet computer. The route to high power with the V6 includes bigger injectors and Megasquirt or other programmable FI.
76 Suzuki GT500
2011 Jaguar XKR
A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
Last edited by alfaparticle; 09-12-2017 at 08:16 PM.