Since Race is now now only available through Start a Match, we have changed what constitutes a ranked Race match. All settings outside of Basic and Match Management will now cause the match to be unranked, and thus ineligible for leaderboard inclusion.
To check out the current top racers, select Race Leaders from within the Community tab, and select an arena. To participate, simply finish a ranked Race match, and your score will be saved. Have fun, and set some personal bests!
Source: Quake Live