chocolatehauler,
BX brochure states that the relief is set @ 1780 psi. Sorry, but I don't know the location of the relief adjustment. Don't forget the warranty. I notice too that the fel can run out of oompf sometimes. At first I thought it was underpowered. After thinking about it they are probably just trying to protect the machine from being overstressed, or limiting pressure so that an inexperienced operator can't get into too much trouble. It'd be great to find out their reasoning for the pressure limit.
good luck,
DaveL