Question for the techies...
Currently running stock 440cc injectors on a 2JZ GTE with hi flowed, steel wheel turbos (currently at 19psi but looking at 23-25psi as a start with more fuel), 3.5" dump, 4" Apexi exhaust, using twin 040 pumps, and a Sard rising rate regulator set at 75psi (yes, high, but was maximising the stock injectors)

Question is: if I swap to a more appropriate 800cc Sard injector (direct drop in) plus twin feed HKS rail, can I just adjust the injector lag and size in the PowerFC and keep my tune?

My understanding is that the higher fuel pressure makes the injectors behave differently in terms of flow, ie the 800cc will have a different orifice size to the 440's, thus different flow at varying fuel pressure and will thus not be a linear conversion.
I guess the bottom line is I am trying to avoid a heap more dyno time to do the swap and up the boost...just wondering if its safely feasible.