Does anyone here know about ackerman calculations?

[DMXF]

As part of a complete optimization of my suspension/steering alignment, I'm trying to determine % ackerman by toe change measurements, not geometric 2D drawings. I've created a curve of increased inside wheel angle vs steering input off my car and applied the equations shown near the beginning of this site: http://www.smithees-racetech.com.au/ackerman.html

I can calculate the R radius dimension from the outside wheel and then see whether the angle of the inside wheel is greater or less than what the equations show (equal to would be 100%?), essentially generating something like the curves shown on this site where I'm using a 0 deg Rear Slip line: http://students.washington.edu/denny...e/TOEFIG03.TIF The problem is this % ackerman varies with outer wheel angle, like shown in this last site where the R dimension changes with steering input. Does anyone know how to determine what the % ackerman is by this steering measurement approach? Is there a specific value of R at which 100% ackerman is defined?