adrenaline bullet f1 just started. Just 3 pro teams for now, 3 races underway in the season. Very active league, with a full rookie competition and 11 in elite.
First season, so all pro teams and elite teams started from scratch. Check it out
You may also consider the American Open Wheel Series. We have just 2 spots left in Pro and our next season starts Sunday night (in America). If it's full and you would like to take part, just let me know. =)