Hi glenn... Im still learning myself , but im running 550 injecters in a rb 20, mines running pretty resonable ( reving out) Im just waiting for the dyno guy to tweak it properly...Im no expert but you can try what ive got so far????at the moment...ive set the base timming at 10* , with the ecu set at 0 .... then put the ecu at 27* .... fuel pressure rate at 40psi with vacum hose off at idle...master fuel at 32 ....fuel row 1 is 50% ...fuel row 2 is 36% ...fuel row 3 is 34% ...etc ... good luck..... the guys on here im sure will sort you out better than i can...but its somthing to try in the mean time.