Since nobody has this one going already, I'll start.
Car: 96 Nissan 240SX, (under)prepped for SCCA STU class.
Weight: 2680 w/ driver
HP: 150whp (estimated- 140k miles on stock engine w/ bolt-ons)
Tires: BFG R1 225/45/17 front, R1-S 245/40/17 rear.
Weather: Approx 55deg and windy
Notes: Corded my good front tires on Friday practice and went to an old set of hard compound fronts to finish the weekend. Car was understeering horribly, but I was able to make it turn with judicious application of throttle and steering after turn-in. With better tires, would expect well into the 1:28s.