Grind when turning left

hansoac

I have owned my Z for about 3 days now. It is a lightly used (7,250 miles) 09 with Sport Package and the previous owner was a woman 9 (not saying that some women don't like to drive a car hard). I went to leave yesterday and hopped in the car to go, when I started to pull forward and to the left I noticed a nasty grind/rumble type feeling in the steering wheel. I was backed into the spot and didn't have to reverse to get out, just pulled forward. I noticed the same thing happen when I left the place i went to, was backed in and I started the car and as I pulled away I turned to the left and the grind happened again. I also noticed that the tires are a little bit more worn on the outside than the inside/middle of the tire. Any ideas what this could be or has anyone else had this problem?