João Barbosa Grand-Am Rolex Series results at Barber
| Year | Race # | Start | Finish | Class | Class Rank | Car # | Team | Engine | Owner | Qualifying Time | Laps | X Led | Laps Led | Points |
| 2003 | 4 | 15 | 3 | GTS | 1 | 31 | Capt Craz Soap | Mosler MT900R | Mosler | 5:48.823 | 96 | 0 | 0 | 35 |
| 2004 | 11 | 17 | 30 | GT | 11 | 33 | Maserati of Washington | Maserati Light GT | Ferrari of Washington | 1:27.992 | 79 | 0 | 0 | 20 |
| 2008 | 10 | 17 | 7 | DP | 7 | 59 | Brumos Porsche/Kendall | Porsche Riley | Brumos | 1:24.067 | 103 | 0 | 0 | 24 |
| 2009 | 8 | 15 | 9 | DP | 9 | 59 | Brumos Porsche/Kendall | Porsche Riley | Brumos | 1:24.306 | 108 | 0 | 0 | 22 |
| 2010 | 3 | 10 | 10 | DP | 10 | 9 | Action Express Racing | Porsche Riley | Action Express | 1:21.705 | 106 | 0 | 0 | 21 |
| 2011 | 3 | 10 | 7 | DP | 7 | 9 | Action Express Racing | Porsche Riley | Action Express | 1:25.764 | 104 | 0 | 0 | 24 |
| 2012 | 2 | 8 | 7 | DP | 7 | 9 | Action Express Racing | Chevrolet Corvette DP | Action Express | 1:26.488 | 101 | 0 | 0 | 24 |
| 2013 | 3 | 5 | 9 | DP | 9 | 9 | Action Express Racing | Chevrolet Corvette DP | Action Express | 1:19.858 | 84 | 0 | 0 | 22 |
