I've had a look at port injector duty cycle calculation.
Will post MatLab script later on the
MatLab thread.
Calculation:
Cycle time ms/cycle
= 1000 ms/s * 60 s/min * 2 rev/cycle / RPM rev/min
= 120000 / RPM ms/cycle
Injector duty cycle %
= 100 % * Port_IPW ms / Cycle_time ms
= Port_IPW * RPM /1200 %
With stock port injectors and stock PI : DI ratio map I am up to about 23% duty cycle at redline and 1.2g/rev load.