Um, even if someone here was willing to provide one, it wouldn't work. GTPSP's saves are locked, meaning that they are specific and will only work on the PSPs that they were created.
Post in Official GTPlanet Ad-Hoc Party Races: World G1, Lobby 01 and ask for someone to share with you. Also, if you can't get all the cars you want by sharing you can race and earn more credits than you can by grinding alone.