Haven't confirmed, however, If they are anything like the "regular" bots, their rating and time they run will be determined by what rating your car is. For example - have a friend grab a 1630 or below car and have them join a lobby. Typically those lower lobbies are empty and there are bots available. Once confirmed, join your friend in a 1668 car. Once there, race a bot....the bot will be rated much higher than 1630 (and the bots will have different cars on your screen versus your friends screen).