The AC time trial server is currently running Mugello with the Mazda MX-5 Cup and the McLaren 570S if you want to try setting some laps.
It's official content again, and you can use the unlocker below if you're missing any of the DLC.
server: vrg time trial
pass: tfwnodriftfu
leaderboard: http://198.23.223.127:50041/lapstat
DLC: https://mega.nz/folder/BBwxhS6D#4jJIfs6omnJUaJfsnqPqGQ