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If you go to the Dirt Tour events screen, there are "Free Race" options at the bottom of each event. If you pick those, it should offer to download ghosts of the top times, or people from your friend's list before each race.
And you're given the option to scroll through. You can pick a time that's 30+ seconds behind an average time. I actually did mine on accident. I was just scrolling through to find some good times (during the Shibuya B Tourney) and I accidently selected one of the top 400's and beat it by .12. I believe I placed 233rd in that tourney too. I don't know how some people hacked it down to 10.00. :/