I have a 2008 Mustang GT that has been turned into an SCCA T3 Racecar. Took it to it's first test day, and first session the car ran flawlessly. Second session, the car developed a power steering issue at high RPM. Anything below ~4800RPM, and the power steering works fine. Anything above ~4800RPM, and the steering cuts out completely. It doesn't just lose power steering, but goes into complete steering lock. Steering resumes once the car drops back down in RPM. The rack, pump and lines were original with about 35,000 miles on them. Flushed the system a dozen times, and replaced the pump, but the problem persists.
that is kind of spooky, and almost sounds mechanical, I wonder if there is a loose motor mount allowing the motor or something else to contact and "pin" the steering linkage in place. Definitely something to get figured out before your next run.
I had another thought come to mind, I used to operate a International Military Tractor out on the family ranch, it was bought from a base and the drilling rig cutt off the back where it connected to the PTO and converted to a normal Gannon and Teeth setup for plowing our pastures. It was a diesel and has full hydraulic drive system with 2 speeds on the reduction, it is capable of about 35 MPH, anywho its power steering is very simular to how a car or truck operates, and one time when it ran low on Hydraulic fluid the steering locked up solid, the wheel was literally stuck in place, not even muscling it would move it, and adding fluid fixed it. I wonder if the issue could be similar.
I cannot find the model of our tractor, but it was a custom build for the military with some sort of drilling rig that doubled as a crane originally on the back which was PTO and Hydraulic powered, but it looks nearly identical to this International 660 but ours has extra hardware attached here and there so the 660 was probably the base they added parts to when they made it fit the military's requested capabilities, ours also runs heavy duty truck tires on the front instead of the tractor wheels and tires seen here. The engine looks identical based on its side that is visible, but ours was all dingy camo green flat colored and chipped/worn quite severely. http://gauer001.net/imagesia/1976RWBtractor-50.jpg
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