Hi Russell, I suspect the errors are due to your camber change on bump and droop, i made a Guage years ago that worked great it was two pieces of plywood big enough to cover the wheel rim , one piece sat on the floor with a weight on it, the other piece attached with three small hinges and formed an L shape. on the verticle piece that was about 3 inches from the rim it had a bolt with a lock nut that leaned against one outer edge of the rim the other side had a a dial tester leaning on the other side of the rim to measure any changes in toe, i think you will find the fore and aft movement of the rack has a greater effect on Ackerman ,on your setup is the inner pivot on the rack in line with the line drawn through the inner top and bottom mounting point , alot of suspensions I have looked at recently the rack inner joint is towards the wheel by about 40mm not on the line through the top and bottom inner pivots. if you get stuck give me a call two heads are always better with the Guage on the side it can bend at the hinge and so follow in and out as your camber changes as the wheel rises and falls .
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