P Zeros - Track & Street Pressure?

My car came with P Zeros. I've been running them cold at 33 for street. I've also got a DE coming up and wondering what others have found to be the right pressures to be running under both of those conditions. I plan on getting track tires and wheels fairly soon, but this is what I've got for now. I did a good amount of track time at PEC, so I hope to be running a few decent laps, but have no idea where to start with tire pressures. I get up to 38 with spirited street driving, but my gut tells me that's a little high.



Thanks