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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X5 pics

RIP 4.6is.....

2003 4.6is