| 21.3.1981 | 12 h Sebring | 0 | 935 K3/80 | Field / Ongais | Interscope Racing | 44th |
| 21.3.1981 | 12 h Sebring | 00 | 935 K3/80 | Ongais / Field | Interscope Racing | DNS |
| 21.3.1981 | 12 h Sebring | 01 | 911 Carrera | Flaquer / Gonzalez / Dominguez | T & R Racing | DNS |
| 21.3.1981 | 12 h Sebring | 03 | 934 | Pallavicini | Angelo Pallavicini | 69th |
| 21.3.1981 | 12 h Sebring | 07 | 935 | Heimrath / Heimrath, Jr. | Heimrath Porsche | 62nd |
| 21.3.1981 | 12 h Sebring | 09 | 935 K3 | Henn / Gunn / Belcher | T-Bird Swap Shop | 48th |
| 21.3.1981 | 12 h Sebring | 1 | 935 K3/80 | Fitzpatrick / Busby | John Fitzpatrick Racing | 41st |
| 21.3.1981 | 12 h Sebring | 2 | 935 K3 | Hinze / Minter / Whittington | Marty Hinze Racing | 3rd |
| 21.3.1981 | 12 h Sebring | 3 | 935 M16 | Meister / Stommelen / Grohs | Andial/Meister Racing | 4th |
| 21.3.1981 | 12 h Sebring | 5 | 935 K3 | Akin / Bell / Siebert | Bob Akin Motor Racing | 60th |
| 21.3.1981 | 12 h Sebring | 8 | 935 JLP-3 | Paul / Paul, Jr. | JLP Racing | 66th |
| 21.3.1981 | 12 h Sebring | 15 | 911 Carrera RSR 3.0 | Lutz / Panaccione | D. L. Performance Engineering | 32nd |
| 21.3.1981 | 12 h Sebring | 17 | 935 M16 | Romero / Mendez | Pepe Romero | DNA |
| 21.3.1981 | 12 h Sebring | 18 | 935 | Werner Frank | JLP Racing | DNS |
| 21.3.1981 | 12 h Sebring | 21 | 914/6 | Aschenbrenner | Alps Restoration | 76th |
| 21.3.1981 | 12 h Sebring | 24 | 934 | Refenning / Tilton / Welter | Jack Refenning | 37th |
| 21.3.1981 | 12 h Sebring | 29 | 911 Carrera RSR 3.0 | Northam / Soldevilla | Bill Ferran | 57th |
| 21.3.1981 | 12 h Sebring | 30 | 935 J | Moretti / Mendez / DeNarvaez | Momo/Penthouse | 6th |
| 21.3.1981 | 12 h Sebring | 34 | 924 Carrera GTR | Drolsom / Hoskins / Marcus | Drolsom Racing | 30th |
| 21.3.1981 | 12 h Sebring | 36 | 924 Carrera GTR | Bundy / Miller | Herman + Miller P+A | DNS |
| 21.3.1981 | 12 h Sebring | 38 | 911 | Case | Case Racing | 74th |
| 21.3.1981 | 12 h Sebring | 39 | 911 | Higgins / Mead / Johnson | The Foreign Exchange | 38th |
| 21.3.1981 | 12 h Sebring | 43 | 911 Carrera | Gregg / Young / Varde | Bob Gregg Racing | 34th |
| 21.3.1981 | 12 h Sebring | 52 | 911 | Swanson / Cripe / McDonald | Ours & Hours Racing | 33rd |
| 21.3.1981 | 12 h Sebring | 53 | 911 Carrera RSR | Hochreuter / Brezinka / Hirsch | Fritz Hochreuter | 45th |
| 21.3.1981 | 12 h Sebring | 56 | 911 Carrera | Borlase | Rick Borlase | 68th |
| 21.3.1981 | 12 h Sebring | 57 | 914/6 | Baker / Overby / Gilliland | Personalized Autohaus | 50th |
| 21.3.1981 | 12 h Sebring | 58 | 911 Carrera RSR | Kendall / Smith / Aase | Charles Kendall | 5th |
| 21.3.1981 | 12 h Sebring | 62 | 911 SC | Koll / Kline | Kegel Enterprises | 43rd |
| 21.3.1981 | 12 h Sebring | 79 | 911 Carrera RSR | Van Every | Van Every Racing | 67th |
| 21.3.1981 | 12 h Sebring | 84 | 935 M16 | "Jamsal" / Barrientos / Valiente | Scorpio Racing | 26th |
| 21.3.1981 | 12 h Sebring | 86 | 935/80 | Haywood / Holbert / Leven | Bayside Disposal Racing | 1st |
| 21.3.1981 | 12 h Sebring | 88 | 911 | Bitterauf / Moxley / Leo | Klaus Bitterauf | 35th |
| 21.3.1981 | 12 h Sebring | 90 | 935 K3 | Woods / Kent-Cooke / McKitterick | Cooke Woods Racing/Garretson Enterprises | 2nd |
| 21.3.1981 | 12 h Sebring | 94 | 935 K3 | Whittington / Whittington / Whittington | Whittington Bros | 65th |
| 21.3.1981 | 12 h Sebring | 95 | 935 K3 | Whittington / Whittington / Whittington | Whittington Bros | DNA |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 52 | 935 K3/80 | Bob Wollek | Jägermeister Kremer Racing | 2nd |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 53 | 935 J | Dieter Schornstein | Vegla Racing Team | 12th |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 54 | 935 K3 | Jürgen Lässig | Wera-Meissberg-Team | 5th |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 66 | 935/78-81 | Jochen Mass | Joest Racing | 3rd |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 67 | 935 J | Volkert Merl | Spotoil Racing | 6th |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 72 | 924 Carrera GTR | "John Winter" | Porsche Kremer Racing | 14th |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 80 | 911 SC | Peter Bulian | Peter Bulian | DNS |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 82 | 934 | Paul de Cock | Paul de Cock | DNA |
| 22.3.1981 | DRM Zolder Bergischer Löwe | 85 | 934 | Edgar Dören | Hans Obermaier | DNS |
| 22.3.1981 | CI Gr.2/4/5 Vallelunga | | 935 | "Victor" | "Victor" | 1st |
| 22.3.1981 | CI Gr.2/4/5 Vallelunga | | | Tocci | | 6th |
| 22.3.1981 | Hockenheim | | 934/5 | Pierre Schärer | | 2nd |
| 22.3.1981 | CI Gr.2/4/5 Vallelunga | | | Villa | | ?th |
| 22.3.1981 | Hockenheim | | 935 | Antoine Salamin | | 1st |
| 29.3.1981 | Interserie Nürburgring 300 | 0 | 908/80 | Jochen Mass | Joest-Racing | DNF |
| 29.3.1981 | Interserie Nürburgring 300 | 00 | 908/3 Turbo | Volkert Merl | Joest-Racing | DNA |
| 29.3.1981 | Interserie Nürburgring 300 | 43 | 908/3 Turbo | Siegfried Brunn | Dr. Siegfried Brunn | 4th |
| 29.3.1981 | DRM Nürburgring 300 | 52 | 935 K3/80 | Bob Wollek | Jägermeister Kremer Team | 1st |
| 29.3.1981 | DRM Nürburgring 300 | 53 | 935 J | Dieter Schornstein | Vegla-Racingteam | 5th |
| 29.3.1981 | DRM Nürburgring 300 | 66 | 935/78-81 | Jochen Mass | Joest-Racing | 2nd |
| 29.3.1981 | DRM Nürburgring 300 | 67 | 935 J | Volkert Merl | Spotoil-Racing | 4th |
| 29.3.1981 | DRM Nürburgring 300 | 72 | 934 | Helmut Gall | Helmut Gall | 12th |
| 29.3.1981 | DRM Nürburgring 300 | 79 | 924 Carrera GTR | "John Winter" | Porsche Kremer Racing | DNF |
| 29.3.1981 | DRM Nürburgring 300 | 80 | 911 SC | Peter Bulian | Peter Bulian | DNF |
| 29.3.1981 | DRM Nürburgring 300 | 83 | 930 | Bernd Schiller | Bernd Schiller | 13th |
| 29.3.1981 | DRM Nürburgring 300 | 85 | 930 | Matthias Lörper | Kannacher GT Racing | 15th |
| 5.4.1981 | DRM Hockenheim Jim Clark | 40 | 924 | Klaus Assmuth | Klaus Assmuth | DNA |
| 5.4.1981 | DRM Hockenheim Jim Clark | 52 | 935 K3/80 | Bob Wollek | Jägermeister Kremer Racing | 2nd |
| 5.4.1981 | DRM Hockenheim Jim Clark | 53 | 935 J | Dieter Schornstein | Vegla-Racingteam | 4th |
| 5.4.1981 | DRM Hockenheim Jim Clark | 66 | 935/78-81 | Jochen Mass | Joest Racing | 1st |
| 5.4.1981 | DRM Hockenheim Jim Clark | 67 | 935 J | Volkert Merl | Spot-Oil Racing | DNF |
| 5.4.1981 | DRM Hockenheim Jim Clark | 72 | 924 Carrera GTR | "John Winter" | Porsche Kremer Racing | 14th |
| 5.4.1981 | DRM Hockenheim Jim Clark | 84 | 935 RSR | Urs Schweizer | Scuderia Basilea | DNA |
| 5.4.1981 | DRM Hockenheim Jim Clark | 86 | 911 SC | Herbert Krall | MSC Schorndorf | DNF |
| 5.4.1981 | Australian SCC Baskerville | | 911 Carrera | Peter Fitzgerald | | 3rd |
| 5.4.1981 | Australian SCC Baskerville | | 930 | Johnnie Walker | | 2nd |
| 5.4.1981 | Australian SCC Baskerville | | 935/77A | John Latham | | 1st |
| 12.4.1981 | 100 mile Road Atlanta | 0 | 935 K3/80 | Ted Field | Interscope Racing | 7th |
| 12.4.1981 | 100 mile Road Atlanta | 00 | 935 K3/80 | Danny Ongais | Interscope Racing | 4th |
| 12.4.1981 | 100 mile Road Atlanta | 01 | 934 | Chester Vincentz | Electrodyne | DNA |
| 12.4.1981 | 100 mile Road Atlanta | 04 | 911 Carrera RSR | Rene Rodriguez | Rene Rodriguez | 18th |
| 12.4.1981 | 100 mile Road Atlanta | 05 | 911 Carrera RSR | Tico Almeida | Tico Almeida | 19th |
| 12.4.1981 | 100 mile Road Atlanta | 09 | 935 K3 | Henn / Hinze | Preston Henn | 12th |
| 12.4.1981 | 100 mile Road Atlanta | 1 | 935 K3/80 | John Fitzpatrick | John Fitzpatrick | 1st |
| 12.4.1981 | 100 mile Road Atlanta | 2 | 935 K3 | Marty Hinze | Marty Hinze | DNA |
| 12.4.1981 | 6 h Mugello | 4 | 935 K3 | Dören / Lässig | Weralit Racing Team | 12th |
| 12.4.1981 | 100 mile Road Atlanta | 5 | 935 K3 | Bob Akin | Bob Akin | DNA |
| 12.4.1981 | 6 h Mugello | 5 | 935 K3 | Cooper / Wood | Charles Ivey Racing | 2nd |
| 12.4.1981 | 6 h Mugello | 6 | 935 | Bussi / Guérin | Christian Bussi | 4th |
| 12.4.1981 | 100 mile Road Atlanta | 8 | 935 JLP-3 | John Paul, Jr. | JLP Racing | 8th |
| 12.4.1981 | 6 h Mugello | 12 | 908/3 Turbo | Brunn / Jordan | Siegfried Brunn | 11th |
| 12.4.1981 | 100 mile Road Atlanta | 15 | 911 Carrera RSR 3.0 | Lutz / Panaccione | Doug Lutz | DNA |
| 12.4.1981 | Road Atlanta [GTU] | 22 | 914/4 | Wayne Baker | Wayne Baker | 6th |
| 12.4.1981 | 100 mile Road Atlanta | 30 | 935 J | Gianpiero Moretti | Momo/Penthouse | 9th |
| 12.4.1981 | 6 h Mugello | 34 | 924 Carrera GTR | Zbinden / Vanoli / Kofel | Formel Rennsport Club, Zurich | 13th |
| 12.4.1981 | 100 mile Road Atlanta | 34 | 924 Carrera GTR | George Drolsom | George Drolsom | DNA |
| 12.4.1981 | Road Atlanta [GTU] | 52 | 911 | Van McDonald | Ours & Hours Racing | 10th |
| 12.4.1981 | Road Atlanta [GTU] | 54 | 911 | Rene Azcona | Rene Azcona | DNA |
| 12.4.1981 | Road Atlanta [GTU] | 62 | 911 SC | Bill Koll | Kegel Enterprises | 22nd |
| 12.4.1981 | 100 mile Road Atlanta | 90 | 935 K3 | Bobby Rahal | Cooke Woods Racing/Garretson Ent. | 3rd |
| 12.4.1981 | 100 mile Road Atlanta | 94 | 935 K3 | Bill Whittington | Bill Whittington | 13th |
| 12.4.1981 | SM Hockenheim | | | Rolf Madörin | | ?th |
| 12.4.1981 | SM Hockenheim | | 935 | Antoine Salamin | | ?th |
| 12.4.1981 | SM Hockenheim | | 935 | Rolf Fuhrer | | ?th |