to move from the theory to practice, just connect Conzult or NDS and read the Duty Cycle in real time, I can not try with my Z
But, I have an example with my 200sx S14, engine SR20DET,
it was equipped with a complete exhaust system without catalyst, fuel pump walbro, flywheel 6kg, intake filter Apexi, intercooler Silvia S15, delete EGR, spark plug irridium IK24, Boost controler Greddy profect b2 with 15PSI of boost, injectors OEM 370cc, a Eprom Horsham.dev to configure the set
With 15PSI, my injectors OEM 370cc had a duty cycle between 90 and 95%