PORSCHE RACING HISTORYJo Siffert (CH)
1970 : Daytona 24 Hours - 2nd overall : Sebring 12 Hours - 2nd in class : Targa Florio - 1st overall : Spa 1000 km - 1st overall : Watkins Glen 6 Hours - 2nd overall : Can-Am Watkins Glen - 2nd : Zeltweg 1000 km - 1st overall
1 February 1970 - Daytona 24 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 917 K | 917-014 | S | Jo Siffert (CH)/Brian Redman (GB) | J. W. Engineering (GB) | 2nd | 2nd | 2nd | 679 laps |
21 March 1970 - Sebring 12 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 917 K | 917-013 | S5.0 | Pedro Rodríguez (MEX)/Leo Kinnunen (FI)/Jo Siffert (CH) | J. W. Automotive Engineering Ltd. (GB) | 4th | 2nd | 5th | 244 laps |
21 March 1970 - Sebring 12 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 14 | Porsche 917 K | 917-009 | S5.0 | Jo Siffert (CH)/Brian Redman (GB)/Leo Kinnunen (FI) | J. W. Automotive Engineering Ltd. (GB) | DNF | 2nd | 211 laps - Accident Damage |
12 April 1970 - Brands Hatch 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 9 | Porsche 917 K | 917-004 | S5.0 | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive Engineering Ltd. (GB) | DNF | 5th | 176 laps - Accident |
25 April 1970 - Monza 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 8 | Porsche 917 K | 917-009 | S5.0 | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive Engineering Ltd. (GB) | 12th | 9th | 1st | 158 laps |
3 May 1970 - Targa Florio - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 12 | Porsche 908/03 | 908/03-008 | P3.0 | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive Engineering (GB) | 1st | 1st | 1st | 11 laps |
17 May 1970 - Spa 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 24 | Porsche 917 K | 917-014 | S5.0 | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive Engineering (GB) | 1st | 1st | 2nd | 71 laps |
31 May 1970 - Nürburgring 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 20 | Porsche 908/03 | P3.0 | Brian Redman (GB)/Jo Siffert (CH) | J. W. Automotive Engineering (GB) | DNF | 1st | 22 laps - Oil Pressure |
16 June 1970 - Le Mans 24 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 20 | Porsche 917 K | 917-004 | S5.0 | Jo Siffert (CH)/Brian Redman (GB) | John Wyer Automotive Engineering (GB) | DNF | 3rd | 156 laps - Engine |
11 July 1970 - Watkins Glen 6 Hours - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 917 K | 917-014 | S5.0 | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive Engineering Ltd. (GB) | 2nd | 2nd | 1st | 308 laps |
12 July 1970 - Can-Am Watkins Glen - Can-Am - Canadian-American Challenge Cup
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 917 K | 917-014 | Jo Siffert (CH) | John Wyer Automotive (GB) | 2nd | 12th | 87 laps |
11 October 1970 - Zeltweg 1000 km - International Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 23 | Porsche 917 K | 917-031 | S5.0 | Jo Siffert (CH)/Brian Redman (GB) | J. W. Automotive (GB) | 1st | 1st | 5th | 170 laps |