rear alignment - notes
#1
04-14-2013, 05:47 PM
rear alignment - notes
disclaimer: this post is for informational purposes only and is not intended as advice to any party to attempt an alignment on their own, with these or any other settings.
continued from:
https://www.jaguarforums.com/forum/x...eels-do-87146/
These notes apply to the oem IRS design as fitted to the X300/X308 and XK/XKR in unmodified form.
The rear toe adjustment has the following observed characteristics which may be helpful to some people:
- full sweep from full toe-out to full toe-in is 3 hex flats
- the sweep is approximately 0.72 degrees
therefore,
- a single hex flat is approximately 0.72/3 = 0.24 degrees
As you can imagine from the above, a change of 0.01 degrees is only an imperceptible nudge on the adjusting bolt and can be upset just by tightening the nut ... even with a backup wrench.
In the end, the adjustment was set at: L = 0.040 degrees and R = 0.045 degrees. The purpose in doing so is twofold. First to address backend wander in freezing slush, and second to reduce rolling resistance. Note that the toe-in is less than the minimum specified by Jaguar. Therefore, these settings are not for people who do not understand exactly what they are doing and how the changes will affect vehicle handling.
continued from:
https://www.jaguarforums.com/forum/x...eels-do-87146/
I *finally* worked out with the aid of a bottle lid as a wheel that if the half shaft is considered a fixed mount, the front of the wishbone is considered a fixed mount, and the rear of the wishbone is considered a movable point, then a toe adustment affects both camber and toe. If there is excessive positive toe, and excessive negative camber, then both will move towards the good side as the positive toe is backed out. How much? Don't know yet.
The rear of the XJR is currently sitting with about 0.4 degrees toe-in and -1.5 degrees camber. The goal is zero'ish toe and if the camber goes more to the vertical, then all is good.
The rear of the XJR is currently sitting with about 0.4 degrees toe-in and -1.5 degrees camber. The goal is zero'ish toe and if the camber goes more to the vertical, then all is good.
The rear toe adjustment has the following observed characteristics which may be helpful to some people:
- full sweep from full toe-out to full toe-in is 3 hex flats
- the sweep is approximately 0.72 degrees
therefore,
- a single hex flat is approximately 0.72/3 = 0.24 degrees
As you can imagine from the above, a change of 0.01 degrees is only an imperceptible nudge on the adjusting bolt and can be upset just by tightening the nut ... even with a backup wrench.
In the end, the adjustment was set at: L = 0.040 degrees and R = 0.045 degrees. The purpose in doing so is twofold. First to address backend wander in freezing slush, and second to reduce rolling resistance. Note that the toe-in is less than the minimum specified by Jaguar. Therefore, these settings are not for people who do not understand exactly what they are doing and how the changes will affect vehicle handling.
Last edited by plums; 04-14-2013 at 06:50 PM.
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