I found this information at the link below. That same link has good setup information under the COT Setups and tips for nascar 08 and 09
thread.
I hope this helps someone, but I find at the superspeedways that I run 46.5s at tona and 48.6s at dega. i like the track bars at 9.666, left and right and i shift the front bias back 1 or 2 percent and then go a little up on the wedge. this stops the car from pushing(pulling to the wall in the center of the corner) and allows you to maintain better speed in the corners. if you apply this to martin6martin's set you be a tad quicker