| 28.6.1981 | Norisring Trophäe | 54 | 935 | | Gelo-Racing-Team | DNA |
| 4.7.1981 | 250 mile Daytona Paul Revere | 0 | 935 K3/80 | Field / Whittington | Interscope Racing | 7th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 00 | 935 K3/80 | Bill Whittington | Interscope Racing | 33rd |
| 4.7.1981 | 250 mile Daytona Paul Revere | 01 | 911 S | Roehrig / White | | 13th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 05 | 911 Carrera RSR | Tico Almeida | Tico Almeida | 36th |
| 4.7.1981 | Trans-Am Lime Rock | 1 | 911 SC | John Bauer | Larry Green Racing | 5th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 9 | 935 K3/80 | Rahal / Garretson | Garretson Racing | 18th |
| 4.7.1981 | Trans-Am Lime Rock | 12 | 924 Carrera GTR | Al Holbert | Holbert Racing | 2nd |
| 4.7.1981 | Trans-Am Lime Rock | 14 | 924 Carrera GTR | Doc Bundy | Holbert Racing | 3rd |
| 4.7.1981 | 250 mile Daytona Paul Revere | 15 | 911 Carrera RSR 3.0 | Doug Lutz | D. L. Performance Engineering | 29th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 18 | 935 JLP-3 | John Paul, Jr. | JLP Racing | 3rd |
| 4.7.1981 | 250 mile Daytona Paul Revere | 22 | 914/4 | Robert Overby | | 28th |
| 4.7.1981 | Trans-Am Lime Rock | 23 | 911 SC | Bob Zulkowski | Metal Craft Racing | 17th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 24 | 934 | Ren Tilton | | 4th |
| 4.7.1981 | Trans-Am Lime Rock | 36 | 924 Carrera GTR | Paul Miller | Herman+Miller Porsche-Audi | 12th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 38 | 911 | Ron Case | Ron Case | 12th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 46 | 935 J | de Narváez / Haywood | DeNarvaez Enterprises | 1st |
| 4.7.1981 | Trans-Am Lime Rock | 58 | 911 SC | Monte Shelton | Porsche-Audi Northwest | 9th |
| 4.7.1981 | 250 mile Daytona Paul Revere | 84 | 935 M16 | "Jamsal" / Barrientos | Scorpio Racing | 23rd |
| 4.7.1981 | 250 mile Daytona Paul Revere | | 935 K3/80 | John Fitzpatrick | John Fitzpatrick Racing | DNS |
| 5.7.1981 | MN GT Donington | 8 | 924 Carrera GTR | Richard Lloyd | Canon Cameras Racing with GTi Engineering | DNA |
| 5.7.1981 | DRM Nürburgring GP Tourenwagen | 52 | 935 K4 | Bob Wollek | Jägermeister Kremer Racing | 1st |
| 5.7.1981 | DRM Nürburgring GP Tourenwagen | 53 | 935 J | Dieter Schornstein | Vegla Racing Team | 4th |
| 5.7.1981 | DRM Nürburgring GP Tourenwagen | 56 | 935 K3/81 | "John Winter" | Porsche Kremer Racing | 3rd |
| 5.7.1981 | Vila Real | 76 | 935 Aurora | Joaquim Moutinho | Team Miura / Ciprac | 9th |
| 5.7.1981 | DRM Nürburgring GP Tourenwagen | 80 | 911 SC | Peter Bulian | Peter Bulian | 10th |
| 5.7.1981 | Vila Real | 83 | 935 A4 | Robert Giannone | Robert Joseph Giannone | 1st |
| 5.7.1981 | Vila Real | 84 | 935 Aurora | Ruffino Fontes | Maconde | raced |
| 5.7.1981 | Vila Real | 85 | 935 K2 | Jorge Petiz | Venêncio - Ponto Verda | raced |
| 5.7.1981 | Vila Real | 86 | 911 S | Maurizio João Marques | Maurizio João Marques | DNA |
| 5.7.1981 | DRM Nürburgring GP Tourenwagen | | 930 | Matthias Lörper | | 11th |
| 5.7.1981 | Erding | | 935/77A | Franz Gschwender | Franz Gschwender | 2nd |
| 12.7.1981 | 6 h Watkins Glen | 0 | 935 K3/80 | Field / Whittington | Interscope IMSA Racing, Inc. | DNF |
| 12.7.1981 | 6 h Watkins Glen | 00 | 935 K3/80 | Field / Whittington | Interscope IMSA Racing, Inc. | unused |
| 12.7.1981 | 6 h Watkins Glen | 7 | 935 | Heimrath / Heimrath, Jr. | Heimrath Racing | DNF |
| 12.7.1981 | 6 h Watkins Glen | 8 | 935 JLP-2 | Paul, Jr. / Paul | J.L.P. Racing | unused |
| 12.7.1981 | 6 h Watkins Glen | 9 | 935 K3/80 | Mears / Garretson / Rutherford | Garretson Racing | 3rd |
| 12.7.1981 | 6 h Watkins Glen | 11 | 935 K3/80 | Fitzpatrick / Busby | John Fitzpatrick Racing | 4th |
| 12.7.1981 | 6 h Watkins Glen | 13 | 911 Carrera | Southard / Altman / Altman | Southard Motor Racing | 9th |
| 12.7.1981 | 6 h Watkins Glen | 18 | 935 JLP-3 | Paul, Jr. / Paul | J.L.P. Racing | DNF |
| 12.7.1981 | 6 h Watkins Glen | 21 | 914/6 | Aschenbrenner / Moennick | Alps Restoration, Inc. | DNF |
| 12.7.1981 | 6 h Watkins Glen | 22 | 935 K3 | Hinze / Whittington / Henn | Marty Hinze Racing | 5th |
| 12.7.1981 | 6 h Watkins Glen | 23 | 911 | Lax / Lausberg | Stephen Lax Racing | DNF |
| 12.7.1981 | 6 h Watkins Glen | 26 | 911 Carrera RSR | Selby / Roe | Roe/Selby Racing | 10th |
| 12.7.1981 | 6 h Watkins Glen | 30 | 935/78-81 | Moretti / Rahal | Momo Accessories, Inc. | 6th |
| 12.7.1981 | 6 h Watkins Glen | 33 | 934 | Frank / Bartling | Toyota Village | DNF |
| 12.7.1981 | 6 h Watkins Glen | 36 | 924 Carrera GTR | Miller / Miller | Herman and Miller Porsche-Audi | DNF |
| 12.7.1981 | 6 h Watkins Glen | 43 | 935 K3/80 | Akin / Siebert / Candy | Bob Akin Motor Racing, Inc. | 8th |
| 12.7.1981 | DRM Salzburgring | 52 | 935 K4 | Bob Wollek | Jägermeister Kremer-Racing | 2nd |
| 12.7.1981 | DRM Salzburgring | 53 | 935 J | Dieter Schornstein | Vegla-Racing-Team | DNA |
| 12.7.1981 | DRM Salzburgring | 59 | 935/77A | Franz Gschwender | Franz Gschwender | 5th |
| 12.7.1981 | DRM Salzburgring | 62 | 935 K3/81 | | Porsche Kremer-Racing | DNF |
| 12.7.1981 | 6 h Watkins Glen | 74 | 911 | Hulse / Speakman | | DNF |
| 12.7.1981 | 6 h Watkins Glen | 79 | 924 Carrera GTR | Winters / Bergstrom | Promotion Ltd./Whitehall Capital | DNF |
| 12.7.1981 | DRM Salzburgring | 80 | 911 SC | Peter Bulian | Peter Bulian | DNA |
| 12.7.1981 | 6 h Watkins Glen | 86 | 935/80 | Haywood / Leven | Bayside Disposal Racing | DNF |
| 12.7.1981 | 6 h Watkins Glen | 91 | 934 | Vincentz / Van Every / Wood | Electrodyne, Inc. | 7th |
| 12.7.1981 | SM Hockenheim | | 924 Carrera GTR | Peter Zbinden | | ?th |
| 12.7.1981 | SM Hockenheim | | 935 RSR | Urs Schweizer | Scuderia Basilea | ?th |
| 12.7.1981 | SM Hockenheim | | 934/5 | Pierre Schärer | | ?th |
| 12.7.1981 | SM Hockenheim | | 935 | Antoine Salamin | | ?th |
| 25.7.1981 | Trans-Am Road America | 1 | 911 SC | John Bauer | Larry Green Racing | 3rd |
| 25.7.1981 | Trans-Am Road America | 7 | 924 Carrera GTR | Ludwig Heimrath | Heimrath Racing | 17th |
| 25.7.1981 | Trans-Am Road America | 14 | 924 Carrera GTR | Doc Bundy | Holbert Racing Inc. | 39th |
| 25.7.1981 | Trans-Am Road America | 23 | 911 SC | Bob Zulkowski | Metal Craft Racing | 34th |
| 25.7.1981 | Trans-Am Road America | 30 | 930 | Werner Frank | Toyota Village Inc. | 23rd |
| 25.7.1981 | Trans-Am Road America | 36 | 924 Carrera GTR | Paul Miller | Herman and Miller Porsche Audi | 37th |
| 25.7.1981 | Trans-Am Road America | 57 | 930 | Monte Shelton | Monte's Motors Co. | 1st |
| 26.7.1981 | 100 mile Sears Point | 0 | 935 K3/80 | Ted Field | Interscope Racing | 19th |
| 26.7.1981 | 100 mile Sears Point | 00 | 935 K3/80 | Ted Field | Interscope Racing | T-car |
| 26.7.1981 | 100 mile Sears Point | 04 | 911 Carrera RSR | Rene Rodriguez | T & R Racing | 11th |
| 26.7.1981 | 100 mile Sears Point | 1 | 935 K3/80 | John Fitzpatrick | John Fitzpatrick Racing | 22nd |
| 26.7.1981 | Sears Point [GTU] | 3 | 914/6 | Jon Longmire | Jon Longmire | 30th |
| 26.7.1981 | Sears Point [GTU] | 6 | 911 | Bob Barnes | | 29th |
| 26.7.1981 | Sears Point [GTU] | 8 | 911 | John Johnson | John Johnson | 10th |
| 26.7.1981 | 100 mile Sears Point | 9 | 935 K3/80 | Bobby Rahal | Garretson Racing | 18th |
| 26.7.1981 | 100 mile Sears Point | 12 | 935 M16 | Bruce Canepa | Bruce Canepa | 9th |
| 26.7.1981 | Sears Point [GTU] | 22 | 914/4 | Wayne Baker | Personalized Autohaus | 1st |
| 26.7.1981 | 100 mile Sears Point | 24 | 911 Carrera | Brent Regan | | 13th |
| 26.7.1981 | Sears Point [GTU] | 24 | 911 | Larry Chmura | | 9th |
| 26.7.1981 | 100 mile Sears Point | 30 | 935/78-81 | Gianpiero Moretti | Momo/Penthouse | 4th |
| 26.7.1981 | 100 mile Sears Point | 31 | 911 Carrera RSR | Tom Alan Marx | RSR Associates | 25th |
| 26.7.1981 | Sears Point [GTU] | 31 | 911 | Charles Longmire | | 32nd |
| 26.7.1981 | Sears Point [GTU] | 39 | 911 | Greg LaCava | | 8th |
| 26.7.1981 | Sears Point [GTU] | 45 | 914/6 | Ray Ratcliff | Autosport Technology | 11th |
| 26.7.1981 | 100 mile Sears Point | 46 | 935 J | Mauricio de Narváez | DeNarvaez Enterprises | 5th |
| 26.7.1981 | 100 mile Sears Point | 49 | 911 Carrera RSR | Bob Copeman | R. C. Copeman Racing | 29th |
| 26.7.1981 | 100 mile Sears Point | 58 | 911 Carrera RSR | Chuck Kendall | Kendall Racing | 14th |
| 26.7.1981 | Sears Point [GTU] | 62 | 911 SC | Bill Koll | Kegel Enterprises | 2nd |
| 26.7.1981 | Sears Point [GTU] | 73 | 911 | Jerry Demele | | 12th |
| 26.7.1981 | 100 mile Sears Point | 86 | 935/80 | Hurley Haywood | Bayside Disposal Racing | DNS |
| 26.7.1981 | 100 mile Sears Point | 96 | 911 Carrera | Al Thomas | | 23rd |
| 1.8.1981 | DRM Hockenheim GP | 52 | 935 K4 | Bob Wollek | Jägermeister Kremer Racing | DNF |
| 1.8.1981 | DRM Hockenheim GP | 53 | 935 J | Dieter Schornstein | Vegla Racing Team | 7th |
| 1.8.1981 | DRM Hockenheim GP | 54 | 935 K3 | Jürgen Lässig | Wera-Meissenberg-Team | DNF |
| 1.8.1981 | DRM Hockenheim GP | 65 | 935/77A | Claude Haldi | Claude Haldi | DNF |
| 1.8.1981 | DRM Hockenheim GP | 66 | 935 J | Jochen Mass | Joest-Racing | 3rd |
| 1.8.1981 | DRM Hockenheim GP | 67 | 935 J | Volkert Merl | Spot-Oil-Racing | 4th |
| 1.8.1981 | DRM Hockenheim GP | 68 | 934/5 | Pierre Schärer | Schaerers Schmuckschächtli Racing | DNF |
| 1.8.1981 | DRM Hockenheim GP | 72 | 935 K3/81 | "John Winter" | Porsche Kremer Racing | 5th |