J871yhk,
I do like a challenge but it would be uneconomical for me to even think about doing this
plus I dont get much time to do these things lately.
It would be a bitch to set up initially and if I am honest I have no interest
in this market as others have already sewn it up!

The problem is solved by having differing injector durations for the same load
(normally all the same) and changing the phasing and/or injection
start poinjt for the port in question.
Its nasty !!!!