Board Thread:Game Discussion/@comment-27808032-20160627033826/@comment-27945602-20160705044329

I think they check it when one session of WTTT ends. The change was whenever you submit your Time Trial, you also submit your car's PR. Before they give rewards away, they checks the submited PR with your last save data's PR. They would ignore the higher value. If it have been lowered, They can conclude that he or she should have rented the upgrades, or even the car (There would be no car that they used on Time Trial on the latest save data.)