[RichyUK]

Just looking at my yz2 and rb6 now and I'd say they differ because of the style of rack on each. The rack on the rb6 has the mounting points to cranks along its center line pretty much where as the yz2's rack to crank mounting point is quite offset in comparison. This means the ball stud on the yz2 rack is in line pretty much with the mounting to the cranks, but the rb6 ball stud is offset much more towards the front of the car in realation to the rack to crank mounting point.

Which should explain why it works different on the rb6 and actually shows it doesn't matter which way the cranks swing, it's just down to geometry of where ball studs are in relation to rack/crank mounting points