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I'm certainly not an expert on full hydro steering, however in talking to my brother who is currently designing his new rig (front and rear steer Axletech 4000's on 54" ag tires), pump flow seems to be a major concern. Depending on the ram size and stroke, system speed will be determined by flow, so if you're marginal in any way, I imagine that will mess with the hydroboost. The orbital valve displacement combined with the hydraulic cylinder volume will determine the lock to lock.
There are hydraulic prioritization valves, but which do you prioritize...brakes or steering? They're both pretty important.
FWIW, KOH rigs like Hell's Bells (666) running front and rear steer run Howe Performance trophy truck pumps with something like 11GPM flow rates, but that's a $1300 pump IIRC. Other guys with the big Havoc type buggy/truggy applications run more conventional Saginaw type pumps (one or two), and then a separate electric over hydraulic pump for the rear steer, since it only sees intermittent use, but none of the ones I saw up at Mountain Havoc this year were running hydroboost that I could see anyway. Most were manual brakes, and an couple were vacuum assist.
Hydroboost really is the flow "restriction". Minimal headaches with hyd assist but after talking to several companies about hydroboost gpm limitations- they all agreed that any flow over about 2.5-3.0 gpm and the hydroboost is the restrictor.
Van supposedly for a fee of $400 or so, does some sort of flow enhancement on the hydroboost and some on the list here has said it's helped...
Good luck...with my limited knowledge of full hydro-steer systems but knowing a bit more on hydroboost... I'd definitely do what Apogee mentioned which is quite common and run 2 pumps...
Serp belt and custom hand made brackets. For LS stuff there are brackets out there from vendors like Goat Built. Many of the builds I do we have to build custom brackets do to nothing off the shelf fitting in the confines of the allotted space.
In the days before the high flow pumps that we have today sometimes we did 2 pumps to increase the steering speed.