Gaspar,
I do not remember the "exact" value the ecu showed when I ran the 5 cell pack but I do remember it was very very low. FOr sure, the engine on 2 cells (what I ran first) would only go to 100,000 rpm. On 4 cells would max out at about 150,000 no matter what. When I went to 5 cells, it would go easily to 160,000 but the percent pump voltage showed very low. As suggested in the instruction I installed the bypass and that fixed the problem.

I think different pumps, with varying degrees of efficiency (due to improper tolerances, for instance my hausl was way too tight and the gears rubbing severly so I had to take a .001 clearance cut on the pump face) and in these cheap can motors they use for the pumps, there is much varience too. Can that not explain the fact different people using the same engine/ecu have to use different voltages for pump battery?

regards,
Andrew Coholic