Keselowski left JR Motorsports and Phoenix Racing after the 2009 season to drive the full season for the # 12 Dodge in the Sprint Cup Series and the # 29 Dodge in the Nationwide series for Penske Racing in 2010 . Keselowski left JR Motorsports and Phoenix Racing after the 2009 season to drive full time for the # 12 Dodge for Penske Racing in 2010 .