Motorsport Forums 
Discussion of every form of racing.
http://www.motorsportforums.com/10 Tenths Motorsport
Discussion forum on all aspects of motorsport from F1, Touring cars, Bikes, Kart to National and club racing.
http://www.ten-tenths.com/forum/
Racing Message Boards
Includes discussions on sprints, stock cars, midgets, enduros, karts, dwarfs, vintage racing and drag racing.
http://www.4m.net/
Speed Society
Focused primarily on racing topics such as drag, autocross, and road racing. Also covered are shows, automotive trends and the automotive aftermarket. Includes forums for general topics, current events, and news as well.
http://speed-society.com/forum/phpBB2/portal.php
