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Originally Posted by weasel56
The pressure assist is speed based, not rpm based. Controlled by controlling valve positions. Also the teeth on the cross bar in the rack are different widths from the center towards the ends... this is becoming hard to describe as how involved our steering systems are, so I am geting tempted to scan some pages from the "chassis dynamics/undercar technologies" books obtained during training. But I can be lazy... Any specific areas of the steering system you need info on?
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As far as I know there are three types of power assist steering types: input based on engine speed, vehicle speed, tire torque/slip. In some places I've read that the Servotronic system is vehicle speed based, others that it's based on the tire slip.