[Flying Toaster]

I have an autox event coming up in 2 weeks and will be running R6's for the first time. Those with experience with this tire (or A6's), what is a good starting point for tire pressure? I realize the R6 will be hard to heat up for an autox, but I got them from a friend, couldn't refuse. My plan is to go for a 5 minute ride down the street & back to try pre-heating them. Here is my setup:

-73 911 weighing in roughly 2400lbs?
-21mm/30mm front/rear t-bars
-stock front & rear sways
-2.5 degrees negative in the rear
-1.5 negative in the front
-(I forget my front & rear toe settings, written down somewhere)
-225/45/15 hoosier r6's in the front on 15x7's
-275/35/15 r6's in the rear on 15x9.5's
-The event is in upstate, NY, so morning temp may very well be in the high 40's, low 50's

Thanks in advance. With a good starting point range, I can tweak after each run.