Sports Car Club of America announced today that Registration for the 2010 Tire Rack SCCA Solo National Championships has opened at http://www.scca.com.Expecting some 1,200 entries, the Tire Rack Solo Nationals represent the largest competition event in the world. The 38th annual event will be held Sept. 7-10 at the Lincoln Airpark, in Lincoln, Neb.The early bird registration fee of $150 is in effect until Aug. 11. Afterward, the fee increases to $300. Drivers not participating in a Tour or Divisional event will be subject to an additional $180 waiver fee. Further information, including the event supplemental regulations, is available at http://www.scca.com/solonats. In addition to the event registration, Test N Tune registration is also open. Information and a schedule for the Test N Tune course are available on the Nationals event page.