| 1980 · 19th Annual 24 Hour Pepsi Challenge, Daytona International Speedweay | 11 | 59 | 7. GTX | Brumos Porsche | Peter Gregg · Hurley Haywood · Bruce Leven | Porsche 935/80 T | — | 584 | WSPR historical record |
| 1980 · 6 hours of Watkins Glen | did_not_start | 3 | Gr.5 | Jim Busby | Jim Busby · Rick Mears · Peter Gregg | Porsche 935 | — | | WSPR historical record |
| 1980 · Molson Canadian 1000 IMSA GT Series, Mosport Park | entry_only | 59 | GTX | Brumos Porsche | Peter Gregg | Porsche 935/80 Tu | — | | WSPR historical record |
| 1979 · 1979 24 Hours of Le Mans | DNF | 63 | IMSA GTX | Charles Pozzi / JMS Racing | Michel Leclère · Claude Ballot-Léna · Peter GreggMichel Leclère Claude Ballot-Léna Peter Gregg | Ferrari 512BB-LM | Ferrari 4.9L F12 | 219 | Wikipedia contributors · CC BY-SA 4.0 |
| 1979 · 18th Annual 24 Hour Pepsi Challenge, Daytona International Speedway | 32 | 1 | 6. GTX | Gelo Racing Team | Bob Wollek · Jacky Ickx · Peter Gregg | Porsche 935/77 | — | 342 | WSPR historical record |
| 1979 · Watkins Glen 6 Hours Trans-Am and World Championship of Makes, Watkin s Glen Grand Prix Circuit | 31 | 85 | - | Bruce Leven | Peter Gregg · Hurley Haywood · Bruce Leven | Porsche 935/77 | — | 72 | WSPR historical record |
| 1979 · Watkins Glen 6 Hours Trans-Am and World Championship of Makes, Watkin s Glen Grand Prix Circuit | 42 | 09 | Gr.5 | Preston Henn | Rick Mears · Preston Henn · Peter Gregg | Porsche 93 | — | 7 | WSPR historical record |
| 1978 · 1978 24 Hours of Le Mans | 3 | 7 | Gr.6 S 3.0 | Martini Racing Porsche System | Hurley Haywood · Peter Gregg · Reinhold JoestHurley Haywood Peter Gregg Reinhold Joest | Porsche 936-77 | Porsche 911/78 2.1L F6 turbo | 362 | Wikipedia contributors · CC BY-SA 4.0 |
| 1978 · 17th Annual 24 Hours of Daytona Camel GT Challenge | 1 | 99 | 1. GTX | Brumos Porsche | Rolf Stommelen · Toine Hezemans · Peter Gregg | Porsche 9 | — | 680 | WSPR historical record |
| 1978 · 17th Annual 24 Hours of Daytona Camel GT Challenge | 9 | 59 | 6. GTX | Brumos Porsche | Peter Gregg · Claude Ballot-Léna · Brad Frisselle | Porsche 935/77 | — | 621 | WSPR historical record |
| 1978 · Watkins Glen 6 Hours/Trans-Am Championship, Watkins Glen Grand Prix C ircuit | 1 | 30 | 1. Gr.5 | Weisberg Gelo | Toine Hezemans · John Fitzpatrick · Peter Gregg | Porsche 935/77 | — | 146 | WSPR historical record |
| 1977 · 1977 24 Hours of Le Mans | 3 | 40 | Gr.5 SP | JMS Racing ASA Cachia | Claude Ballot-Léna · Peter GreggClaude Ballot-Léna Peter Gregg | Porsche 935 | Porsche 2.9L F6 turbo | 315 | Wikipedia contributors · CC BY-SA 4.0 |
| 1977 · 24 Hours of Daytona, Daytona International Speedway | 10 | 61 | 5. GTO | Brumos Racing | Peter Gregg · Jim Busby | Porsche 934 | — | 590 | WSPR historical record |
| 1977 · SCCA Trans-Am Championship and 6 Hours of Watkins Glen World Champion ship of Makes, Watkins Glen GP | 6 | 59 | 6. Gr.5 | Brumos Racing | Peter Gregg · Claude Ballot-Léna · John Gunn | Porsche 934 Tu | — | 163 | WSPR historical record |
| 1977 · Molson Diamond Trans-Am Championship and World Championship of Makes, Mosport Park | disqualified | 59 | 1. TA2 | Brumos Porsche | Peter Gregg · Bob Wollek | Porsche 934/5 | — | 243 | WSPR historical record |
| 1976 · 1976 24 Hours of Le Mans | DNF | 41 | Gp.5 SP | BMW Motorsport GmbH | Brian Redman · Peter GreggBrian Redman Peter Gregg | BMW 3.0 CSL Turbo | BMW 3.2L S6 turbo | 23 | Wikipedia contributors · CC BY-SA 4.0 |
| 1976 · 6 Hours of Watkins Glen World Championship of Makes and SCCA Trans-Am Championship | 4 | 59 | 4. Gr.5 | Brumos Kendall | Peter Gregg · Hurley Haywood | BMW 3.5 CSL | — | 170 | WSPR historical record |
| 1975 · Daytona 24 Hours | 1 | 59 | 1. GTO | Brumos Porsche | Peter Gregg · Hurley Haywood | Porsche Carrer | — | 684 | WSPR historical record |
| 1975 · 6 Hours of Watkins Glen World Championship of Makes and SCCA Trans-Am Championship | 7 | 14 | 2. GT | Holbert's Porsche+Audi | Al Holbert · Peter Gregg | Porsche Carrera RSR | — | 141 | WSPR historical record |
| 1974 · 6 Hours of Watkins Glen World Championship of Makes and SCCA Trans-Am Championship | 3 | 59 | - | Brumos Porsche | Peter Gregg · Hurley Haywood | Porsche Carrer | — | 176 | WSPR historical record |
| 1973 · 1973 24 Hours of Le Mans | 14 | 48 | GTS 3.0 | Sonauto BP Racing | Peter Gregg · Guy ChasseuilPeter Gregg Guy Chasseuil | Porsche 911 Carrera RSR | Porsche 2.8L F6 | 298 | Wikipedia contributors · CC BY-SA 4.0 |
| 1973 · 24 h Daytona | 1 | 59 | 1. S3.0 | Brumos Porsche | Peter Gregg · Hurley Haywood | Porsche Car | — | 670 | WSPR historical record |
| 1973 · Watkins Glen 6 Hours | 7 | 59 | 7. S3.0 | Brumos Porsche | Peter Gregg · Hurley Haywood | Porsche Car | — | 168 | WSPR historical record |
| 1972 · Watkins Glen 6 Hours | retired | 59 | GT2.5 | Brumos Porsche | Hurley Haywood · Peter Gregg | Porsche 911S | — | 91 | WSPR historical record |
| 1972 · Daytona 6 Hours | 7 | 59 | 1. GT2.5 | Brumos Porsche | Hurley Haywood · Peter Gregg | Porsche 911S | — | 166 | WSPR historical record |
| 1972 · Sebring 12 Hours | 5 | 59 | 1. GT2.5 | Brumos Porsche | Peter Gregg · Hurley Haywood | Porsche 911S | — | 215 | WSPR historical record |
| 1971 · Watkins Glen 6 Hours | 6 | 59 | GT2.5 19 | umos Porsche-Audi 22 | Peter Gregg · Hurley Haywood | Porsche 914/6 GT ASK US Br | — | 8 | WSPR historical record |
| 1971 · 24 h Daytona Beach | retired | 59 | GT2.5 23 | umos Porsche 26 | Peter Gregg · Hurley Haywood | Porsche 914/6 GT ASK US Br | — | 0 | WSPR historical record |
| 1971 · Sebring 12 Hours | 14 | 59 | GT2.5 28 | umos Porsche Audi Corp. 19 | Peter Gregg · Hurley Haywood | Porsche 914/6 GT ASK US Br | — | 2 | WSPR historical record |
| 1970 · 24 h Daytona Beach | did_not_start | 52 | S | Tony Dean | Tony Dean · Peter Gregg | Porsche 917K | — | | WSPR historical record |
| 1970 · 24 h Daytona Beach | entry_only | 52 | P | Tony Dean | Tony Dean · Peter Gregg | Porsche 908 | — | | WSPR historical record |
| 1970 · Sebring 12 Hours | 13 | 53 | 1. GT2.0 | Brumos Porsche Audi | Peter Gregg · Pete Harrison | Porsche 911T | — | 205 | WSPR historical record |
| 1969 · 24 h Daytona | retired | 59 | T2.0 | Brumos Porsche | Peter Gregg · Sten Axelsson | Porsche 911 | — | 137 | WSPR historical record |
| 1969 · 12 h Sebring | 17 | 53 | 1. T2.0 | Wilbur Pickett | Wilbur Pickett · Peter Gregg | Porsche 911 | — | 192 | WSPR historical record |
| 1969 · Watkins Glen 6 Hours, 22nd Annual Sports Car Weekend at Watkins Glen | 8 | 58 | 1. GT2.0 | Brumos Porsche Corp. | Peter Gregg · Hurley Haywood | Porsche 911S | — | 235 | WSPR historical record |
| 1968 · 24 h Daytona | 9 | 59 | 1. TA2.0 | Brumos Porsche | Peter Gregg · Sten Axelsson | Porsche 911 | — | 589 | WSPR historical record |
| 1968 · 1000 km Nürburgring | 27 | 117 | 4. GT2.0 | Sten Axelsson | Björn Rothstein · Peter Gregg | Porsche 911T | — | 38 | WSPR historical record |
| 1968 · Watkins Glen 6 Hours | 8 | 59 | 1. GT2.0 | Brumos Porsche | Bert Everett · Peter Gregg | Porsche 911T | — | 244 | WSPR historical record |
| 1967 · 24 h Daytona | retired | 28 | P2.0 | North American Racing Team | Jo Schlesser · Masten Gregory · Peter Gregg | Ferrari Dino 206S | — | 338 | WSPR historical record |
| 1967 · 24 h Daytona | entry_only | 27 | P+2.0 | North American Racing Team | Peter Gregg · Jo Schlesser | Ferrari 330P3 | — | | WSPR historical record |
| 1967 · 12 h Sebring | 7 | 38 | 4. P2.0 | Porsche System Engineering | Joe Buzzetta · Peter Gregg | Porsche 906 | — | 215 | WSPR historical record |
| 1966 · 1966 24 Hours of Le Mans | DNF | 33 | S 2.0 | Porsche System Engineering | Peter GreggPeter Gregg Sten Axelsson | Porsche 906 /6 Carrera 6 | Porsche 1991cc F6 | 321 | Wikipedia contributors · CC BY-SA 4.0 |
| 1966 · 24 h Daytona | 10 | 14 | 3. S2.0 | Brumos Porsche Florida | Peter Gregg · George Drolsom | Porsche 904 GTS | — | 589 | WSPR historical record |
| 1966 · 12 h Sebring | entry_only | - | S2.0 | Brumos Porsche | Peter Gregg · George Barber, Jr. | Porsche 904 GTS | — | | WSPR historical record |
| 1966 · 12 h Sebring | 7 | 54 | 1. S2.0 | US Porsche Germany | George Follmer · Peter Gregg | Porsche 904 GTS ASK | — | 2 | WSPR historical record |
| 1965 · Continental 2000 Daytona | 8 | 10 | 2. GT2.0 | Peter Gregg | Peter Gregg · George Barber, Jr. | Porsche 904 GTS | — | 306 | WSPR historical record |
| 1965 · 12 h Sebring | 45 | 45 | GT2.0 | Peter Gregg | George Barber, Jr. · Peter Gregg | Porsche 904 GTS | — | 99 | WSPR historical record |
| 1964 · 2000 km Daytona | 23 | 44 | 4. GT+2.0 | Peter Gregg | Peter Gregg · Harold St. John · DNS - Roland Hutchinson | Triumph TR4 | — | 234 | WSPR historical record |