A small update for whoever is following this subject.
2 weeks ago I finished the injectordriver addon board for the mega.
I used the LM1949 injector driver but since it was intended for 1A gasoline injectors it is not good enough for the 12A common rail injectors.
There is a resistor used for measuring Amps which is stock at 0.1ohm and currently I am using 0.005ohm and got 6-10 amps running or so, I did try to use 2 of those resistors parallel but that didn't made a difference so I think the chip thinks it's enough.
However the injectors are working!
Despite the opening "lag" of ~450uS they open and close at my arduino's wish and command!
The lag can be easily worked around in the main program since I am using a delay before injecting, it means that delay will become 450uS shorter...
I did some tests:
And summed them up:
