I can tell you for an absolute surety that it take 10.08v to get the timing rack to move to its max position (13.5mm).
Max fueling was tested on a Bosch bench (with a Bosch controller commanding it) discharging through .7mm injector nozzle (as per Bosch's specs). My maxed & balanced P-pump put out 398cc — which, BTW, corroborates what the bench operator told me. He said a 12mm P-pump can put out about 400cc max.
On the same bench, the same day, under the same conditions, my H-pump put out 687cc. Its peak injection pressure is about 150-200 bar higher than a P-pump, & its cam is a MUCH faster rate (meaning it reaches peak pressure much faster). It also has constant pressure valves that retain pressure in the line just below the pop pressure of the injector,;which reduces dribbling, & the haze associated with it.