Cool idea Greg
A baseline run on a Totaly OE car with the "Test" tires would be beneficial
To be fair not only do you have to run the same tires/rims but you also should have the same amount of drop, and alignment settings for each car (Toe and Camber) to have a true test of each C/O setup
Plus take pyrometer readings of the tires and track surface after each run, to weed out any inconsistancies caused by tire/track temps
What also would be cool would be to drop in a GPS based datalogger to plot each cars G's etc at all points in the course.
But I am sure you have allready thought of all that
Drop me a line when you get closer to setting a date for this ... I will see if I can come down and assist if it does not conflict with my Race-crew schedule (and will see If I can steal a MSD Racepack G2X Data Logger)
Moose