PORSCHE RACING HISTORYMartin Birrane (IRL)
1973 : Kyalami 9 Hours - 3rd in class
1 April 1973 - Nürburgring 300 Km - European Championship for Grand Touring Cars
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 112 | Porsche 911 Carrera RSR | 911 360 0185 | GT3.0 | Martin Birrane (IRL) | Crowne Racing Ltd. (GB) | 13th | 7th | 13 laps |
24 June 1973 - Euro GT Nivelles - European Championship for Grand Touring Cars
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 911 Carrera RSR | 911 360 0185 | GT3.0 | Martin Birrane (IRL) | Crowne Racing Ltd. (GB) | 36 laps |
8 July 1973 - European GT Championship Estoril - European Championship for Grand Touring Cars
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 19 | Porsche 911 Carrera RSR | 911 360 0185 | GT3.0 | Martin Birrane (IRL) | Crowne Racing Ltd. (GB) | 7th | 7th | 6th | 78 laps |
5 August 1973 - Euro GT Thruxton - European Championship for Grand Touring Cars
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| Porsche 911 Carrera RSR | 911 360 0185 | GT3.0 | Martin Birrane (IRL) | ? | 8th |
2 September 1973 - Monza 6 Hours - European Championship for Grand Touring Cars
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| Porsche 911 Carrera RSR | John Rulon-Miller (USA)/Martin Birrane (IRL) | ? | 31st |
3 November 1973 - Kyalami 9 Hours - South African Springbok Trophy Series
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 3 | Porsche 911 Carrera RSR | G4.4 | Martin Birrane (IRL)/Guy Tunmer (ZA) | Paradise Beach/Swazi Radio/Crowne Racing | 10th | 3rd | 15th | 301 laps |