Camping at PIR is more like a party than camping.
There is lots of noise. Usually the loudest noise ends at midnight. There is tons of smoke (not JUST Tony Stewart.... lol). It's great if you like to party.
For places to park.... less partying and better roads for walking... as you are pulling in to the rv area, park to the left, not to the right, of the main street (the yellow, brown, or blue sections).
The market is great... prices are just a tiny bit higher, not much, as you might expect.
The tram system is wonderful for getting you to where you want to go.
To help with the noise, if you are traveling with a group, it's good to group into a U or Square formation.
The spaces are not rigid at all... the early bird gets the worm :) If you arrive early, say, by Wednesday, you should have your pick of spots. Take as much room as you need.... set up what you can so somebody else won't park and crowd you.
The first time I went, if I knew about the noise, and Nascar Nutty people (said in the fondest of terms), then I would have enjoyed it more. I've since been a couple more times, and enjoyed it quite well.
It's definitely an experience I am glad I had!
Here is a link to a map....
http://www.phoenixraceway.com/~/media/FAA7A2870C9B451796BC1A4C1FB3AB0F.ashx