I ran my first points-earning autocross with the IROC yesterday (These cars are a BLAST - sorry off topic).

I started the day with:
Front: 44
Rear: 40

Through a progression of changes, I ended up with tire pressures as follows:
Front: 42
Rear: 30

This is an 88 IROC 5.7TPI running Pep Boys Ultra Z tires.

The rear tires still were not deflecting enough but the fronts were OK... I simply ran out of time in reducing the rear pressures.

What do you guys run?