Question about hydraulics and speed

[sparkycuda]

Maybe what is throwing you off is the 140cc/min verses the cylinder size in millimeters. 1cc = 1000 cubic millimeters. A 10mm x 30mm cylinder has a volume of 2355 cubic mm x4 cylinders is 9420 cubic mm. The pump delivers 140,000 c mm/min, so all cylinders could extend fully in less than 4 seconds. In a typical steering setup, pairs of cylinders work opposite of each other - one extends, one retracts - reducing the total volume needed since the rod side has a smaller volume. I would think steering speed should be acceptable since seldom do we need to turn lock-to-lock. Does this help? Let me know if I've misunderstood your specs or needs.
Ken