A few of us on here race a bit.... Kritter, WoodyW and myself raced the Socal Cup this year. There is a few races coming up that I wanna run including the "Triple Crown Series": Bonelli, Fat-tire and Southridge....
really depends on alot of factors.... tires, weight, bike, terrain, wanting a cush' ride or rolling speed.... depending on whre I ride I vary from 30psi to 35-36..... All in what you are comfortable with
As for tire pressure...start at 30 for anything 2.0 and up and ride up a large driveway ledge(2 or so inches) completely square at 5 or so mph....remove 2 psi at a time until you hit rim then bump back up 1. I run less in the front since pinch flats with a suspension fork really dont happen unless you screw up bad.
If you are tubeless you can go lower since you dont have to worry about pinchflats.
I Thought this would be of interest to you. My buddy is selling a helmet I would buy it but my noggin is too big.
I just wanted to let you know that I have a bitchen helmet for sale on craigslist that I thought you or one of your buddies might be interested in. Search for: Troy Lee Designs D2 Bicycle Helmet w/ Custom Paint. It's listed for $300 firm but make me a reasonable offer and we'll go from there. Let me know if you're interested. Thanks.