PORSCHE RACING HISTORYVolkert Merl (D)
1983 : DRM Avus - 2nd overall
1 May 1983 - DRM Avus - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 956 | 956-105 | C | Volkert Merl (D) | Joest Racing (D) | 2nd | 2nd | 1st | 21 laps |
8 May 1983 - Silverstone 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Hans Heyer (D)/Clemens Schickentanz (D)/Volkert Merl (D) | Joest Racing | DNF | 7th | 74 laps - Engine |
19 June 1983 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Volkert Merl (D)/Clemens Schickentanz (D)/Mauricio DeNarváez (COL) | Joest Racing | 4th | 4th | 9th | 361 laps |
24 July 1983 - DRM Diepholz - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 2 | Porsche 956 | 956-105 | C | Volkert Merl (D) | Joest Racing | DNF | 4th |
4 September 1983 - Spa 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Hans Heyer (D)/Volkert Merl (D)/Bob Wollek (F) | Joest Racing | DNF | 12th | 90 laps - Suspension |
2 October 1983 - Fuji 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Bob Wollek (F)/Hans Heyer (D)/Volkert Merl (D) | Joest Racing | 5th | 5th | 4th | 209 laps |