I'll be taking my 90 535i to its 1st driver's school later this month. It has sport springs and shocks, stock sway bars, and 15" wheels with Comp T/A VR4 tires in 225/60. (Please don't lecture me on wheel size or tire choice; I blew my budget for this year on the suspension so I'm just using what I got with the car for now.) The track (Lime Rock) is a 3rd-4th gear momentum course. What would you suggest for starting tire pressures?