PORSCHE RACING HISTORYPorsche 956 - Chassis No. 956-105
10 April 1983 - Monza 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Rolf Stommelen (D)/Clemens Schickentanz (D)/Hans Heyer (D) | Joest Racing | 3rd | 3rd | 7th | 170 laps |
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 |
10 December 1983 - Kyalami 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C | Dieter Schornstein (D)/"John Winter" Louis Krages (D)/Bob Wollek (F) | Joest Racing | 4th | 4th | 9th | 228 laps |
23 April 1984 - Monza 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Volkert Merl (D)/Dieter Schornstein (D) | Schornstein Racing Team | 6th | 6th | 13th | 155 laps |
13 May 1984 - Silverstone 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Dieter Schornstein (D)/Volkert Merl (D)/"John Winter" Louis Krages (D) | Schornstein Racing Team | 9th | 9th | 16th | 198 laps |
17 June 1984 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Volkert Merl (D)/Dieter Schornstein (D)/"John Winter" Louis Krages (D) | Schornstein Racing Team | 5th | 5th | 17th | 339 laps |
15 July 1984 - Nürburgring 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Volkert Merl (D)/"John Winter" Louis Krages (D)/Dieter Schornstein (D) | DS Porsche Racing Team | 10th | 10th | 18th | 194 laps |
29 July 1984 - Brands Hatch 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Volkert Merl (D)/Dieter Schornstein (D)/"John Winter" Louis Krages (D) | Schornstein Racing Team | 9th | 9th | 11th | 217 laps |
2 September 1984 - Spa 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Hans Heyer (D)/Dieter Schornstein (D)/"John Winter" Louis Krages (D) | Joest Racing | 8th | 8th | 10th | 137 laps |
16 September 1984 - Imola 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Hans Heyer (D)/"John Winter" Louis Krages (D)/Dieter Schornstein (D) | Joest Racing | 7th | 7th | 12th | 190 laps |
3 November 1984 - Kyalami 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Henri Pescarolo (F)/Dieter Schornstein (D)/"John Winter" Louis Krages (D) | Joest Racing | 9th | 3rd | 3rd | 187 laps |
2 December 1984 - Sandown Park 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | "John Winter" Louis Krages (D)/Paul Belmondo (F)/Dieter Schornstein (D) | Joest Racing | 11th | 10th | 10th | 184 laps |
14 July 1985 - Hockenheim 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 10 | Porsche 956 | 956-105 | C1 | Klaus Niedzwiedz (D)/Kees Kroesemeijer (NL) | Porsche Kremer Racing (D) | DNF | 10th | 55 laps - Gearbox oil pump |
11 August 1985 - Mosport 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 11 | Porsche 956 | 956-105 | C1 | Ludwig Heimrath, Jr (CDN)/Ludwig Heimrath, Sr (CDN)/Kees Kroesemeijer (NL) | Kremer Porsche Racing (D) | 4th | 4th | 6th | 234 laps |
1 September 1985 - Spa 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 10 | Porsche 956 | 956-105 | C1 | Marc Surer (CH)/Kees Kroesemeijer (NL) | Porsche Kremer Racing (D) | 11th | 10th | 7th | 108 laps |
1 June 1986 - Le Mans 24 Hours - World Sports-Prototype Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 956 | 956-105 | C1 | Pierre Yver (F)/Max Cohen-Olivar (MOR)/Hubert Striebig (F) | Porsche Kremer Racing (D) | DNF | 22nd | 160 laps - Withdrawn After Gartner's Accident |
29 June 1986 - Norisring 100 Mile - World Sports-Prototype Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 11 | Porsche 956 | 956-105 | C1 | Franz Konrad (A) | SAT Porsche Kremer Team (D) | 12th | 11th | 12th | 73 laps |