PORSCHE RACING HISTORYRen Tilton (USA)
1981 : Daytona 250 Miles Paul Revere - 2nd in class
1 February 1981 - Daytona 24 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 38 | Porsche 911 T | 1290486 | GTU | Ron Case (USA)/Dave Panaccione (USA)/Ren Tilton (USA) | Case Racing | 47th | 14th | 65th | 169 laps - Gearbox |
21 March 1981 - Sebring 12 Hours - World Championship for Drivers and Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 24 | Porsche 934 | 930 670 0168 | GTO | Jack Refenning (USA)/Ren Tilton (USA)/Peter Welter (USA) | Jack Refenning (USA) | 37th | 15th | 24th | 139 laps - DNF |
4 July 1981 - Daytona 250 Miles Paul Revere - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 24 | Porsche 934 | 930 670 0168 | GTO | Ren Tilton (USA) | 4th | 2nd | 9th | 60 laps |
29 November 1981 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 24 | Porsche 934 | 930 670 0168 | GTO | Jack Refenning (USA)/Ren Tilton (USA) | 42nd | 20th | 24th | 43 laps |