I urge Perry and crew to incorporate a designated skid pad. Additionally, there should be a designated Slalom (long) area or at minimum a long slalom on the T&T course. These are critical tuning tools.
Thank you Elena, Sandro and Jake, for making this happen, and for being so well-prepared and organized. Those who didn't try this missed the opportunity to practice on the skid pad and measure tire temps and lateral acceleration (Gs.)
The attached picture graphs vehicle speed on the skidpad, (from 5Hz gps data.) It shows a counter-clockwise warm up, then a clockwise warm up, then a counter-clockwise test run. Note the speed increase as the tires warm up. The minimum corner radius was 52.5 ft. I'm guesstimating actual radius at 55+ ft, (2.5 ft off the cones.) Average speed (from gps) was about 29 mph.
Here is lateral acceleration, calculated from the gps speed data. This seems consistent with the 0.95 Gs calculated on-site based on hand-timing the laps. The on-site G value should be lower, since the assumed radius is the minimum 52.5 ft, smaller than the actual value.
||Gs @ 29 mph
Lessons learned: Take all the data, then decide what's important later. I should have taken rear tire temps. Warm-ups in two directions are probably unnecessary.
Next time: Have the adjustable rear swaybar. Bring an assortment of spring rubbers. Test changing driving technique to reduce understeer. Practice making finer adjustments to speed and path. Video/photo the car. Watch another driver in the car. Compare lap times for different radii to show the value of minimizing distance.
[Edit: Fixed Picture]