Suspension Analyzer and Ackerman

[DMSentra]

I'm hoping to get another perspective on the Ackerman readouts while using Suspension Analyzer.
I'm of the understanding that Ackerman does not exist except as a single value, i.e. inches or degrees of toe-out at X turn amount. SA breaks it down into left/right values in degrees and inches per wheel. The crazy part it seems to me is that it lists one or both as being in error as per rotation amount.
What am I missing in that the amount of rotation as a system can be regarded as having Ackerman error?
If I didn't make myself clear, as I am quite prone to do, how can and Ackerman value be telling me that each wheel is turning less and/or more than it shouldas opposed to giving me an error in the difference between the two only? Loren

[johnny yuma]

It is possible due to construction/design of the vehicle ,or chassis twist,accident damage(especially bent tie rod/s) or whatever that the Ackermann is "always" wrong-a bit-except when it flukes a "correct' reading on it's way through from one lock to the other..HOW MUCH it's wrong by is the issue.Also the short lines between the bottom pivots of the steering and the outer tie rod pivots,when extended rearwards on "straight ahead" steering position,should meet at the centre of the rear axle housing for "correct' Ackermann start point.If this cannot be accurately established one way or the other there will be "garbage in-garbage out" issues.

[dtype38]

I'm not an expert DMS, but I would suggest that in any instance of the car turning a corner, there is an ideal angle for both front wheels that place both exactly on the turning circle for the car. If the Ackerman value is not correct then the error can be anywhere from all at one wheel to all at the other, or shared by the both somewherer inbetween. I would guess that what actually happens will depend on the grip at each tyre.