I noticed that if you aren't signed in to PSN when you upgrade GT5, the upgrade fails and the machine reboots. If you are logged in, it works fine.
Says that it "fixes" tires in rain and that when you need to change tires based on track water levels may have changed.
I think we were using:
less than 30% - stick with racing tires
30-35% - switch to racing intermediates
65-70% - switch to racing rain
I was just getting used to setting evnets by HP/KG -- though I still think the horsepower breaks in the lobbies are all :fuck ed up. You can't set 300hp or 500hp (GT300 and GT500). You can't set 375hp (classic Chevy HP rating) I've never understood why it couldn't be set in increments of 1 like PP...