It's definitely higher than what a lot of others run them at. Had read best results come from using the most psi as possible while still getting good grip (more psi gives less rolling resistance). From the previous Gtech testing it seemed a ~2 sec 60' time was achievable with 25-30psi in the Hoosiers, and that time point was what it looked like would be needed to get into the mid 12's. The slush box tranny really reduces the violent start compared to dumping a clutch in a stick so ... used more psi.
Could probably break boost higher rpm's and run lower psi's to improve the 60' and improve the ET. But dang, that's a lot of stress on things.
2011 335d 11.8 sec 120 mph 1/4 mile NHRA certified track
2004 Ram Cummins with lots-o-mods