After a 20 minute first session at the Autobahn CC south course, my off track pressures were 42 psi front and rear with slightly higher pressures on the driver's side.
I bled them down to 40 psi and after the second 20 minute session, they were back up around 41.5 to 42 psi.
I checked the pressures the next morning when things had cooled down in the garage and about 75ºF out and the pressures read 32/33 in the front and 34.5/33.5 psi in the rear. I started the track session at 34 front and 35 rear (1 psi under the door jam pressures).
I guess next time I will run them even lower when I set them cold and make sure to keep letting air out.
Any other hints or tricks would be welcome.
2011 E90 M3 Jet Black/Black
ZPP, ZCP, ZTP, ZCW, 6FL, PDC, shades, 6MT