Originally Posted by garek
You'll be fine with the current set for 1 track day.
As for becoming an expensive hobby, if you become addicted to it like many of us, well, it can be. You'll go through tires and brake pads regularly. I change the oil after 3-4 track days, which is also $120 per change. So it all adds up, but you have to pay to play.
Actually, paying for the track time is the cheapest part.
Do you have PS2's now? Like others have said, they're not very good for the track. They get greasy after a couple of laps, and they're expensive. I'm currently using Bridgestone RE-11s, and I've been really happy with their performance so far. I'll probably try Yokohama AD08s next.
I just got new PS2's and didn't think I would need dedicated track tires going a couple of times but it makes sense. I would hate to wear these out just for the track so all of you have made a good point. Here is a really stupid question and its probably already been answered but what is the ideal tire pressure for the track and I remember reading that it should be different for front and rear and then how often should I be checking it through the day. I have so much to learn, I have to go back and read everyone's info and take notes I am afraid.