| 4.5.1975 | 100 mile Laguna Seca II | 1 | #911 460 9049 | Michael Keyser | | 2nd |
| 4.5.1975 | 100 mile Laguna Seca II | 5 | #911 360 0601 | Bob Harmon | Bob Harmon | 12th |
| 4.5.1975 | 100 mile Laguna Seca II | 9 | #911 360 0610 | Juan Carlos Bolanos | | 30th |
| 4.5.1975 | 100 mile Laguna Seca II | 13 | #911 360 1099 | Randolph Townsend | | 13th |
| 4.5.1975 | 100 mile Laguna Seca II | 14 | #005 0009 | Al Holbert | | 5th |
| 4.5.1975 | 100 mile Laguna Seca II | 23 | #911 360 0727 | Charlie Kemp | Armorall Racing Team | 7th |
| 4.5.1975 | 100 mile Laguna Seca II | 30 | #911 460 9048 | George Dyer | George Dyer | 6th |
| 4.5.1975 | 100 mile Laguna Seca I | 30 | #911 460 9048 | George Dyer | George Dyer | 5th |
| 4.5.1975 | 1000 km Spa | 40 | #911 560 9121 | Bertrams / Wisell | Tebernum Racing | 8th |
| 4.5.1975 | 1000 km Spa | 41 | #911 460 9067 | Schickentanz / Bertrams / Wisell | Tebernum Racing | 6th |
| 4.5.1975 | 1000 km Spa | 42 | #911 460 9052 | Haldi / Béguin | Club Romand | 4th |
| 4.5.1975 | 1000 km Spa | 43 | #911 460 9051 | Ballot-Léna / Andruet | Ecurie Buchet | 5th |
| 4.5.1975 | 100 mile Laguna Seca II | 43 | #911 560 9112 | John Graves | Ecurie Escargot | 19th |
| 4.5.1975 | 1000 km Spa | 44 | #911 460 9040 | Fitzpatrick / Schurti / Schenken | Gelo Racing | 11th |
| 4.5.1975 | 1000 km Spa | 45 | #911 460 9077 | Hezemans / Schenken / Fitzpatrick | Gelo Racing | 9th |
| 4.5.1975 | 1000 km Spa | 46 | #911 360 1045 | Ekberg / Simonsen | Vaeskustugan | DNF |
| 4.5.1975 | 1000 km Spa | 47 | #911 460 9033 | Vanoli / Pallavicini | Pallvano Corse | DNA |
| 4.5.1975 | 1000 km Spa | 48 | #911 360 0885 | Hubert Striebig | Striebig | DNA |
| 4.5.1975 | 1000 km Spa | 50 | | Chateau / Cayeux | Chateau | DNS |
| 4.5.1975 | 1000 km Spa | 52 | #004 0004 | Corthay / Morand | Ecurie Rolloise | DNF |
| 4.5.1975 | 100 mile Laguna Seca II | 59 | | Peter Gregg | | 4th |
| 4.5.1975 | 100 mile Laguna Seca II | 61 | #911 560 9122 | Jim Busby | | 8th |
| 4.5.1975 | 100 mile Laguna Seca II | 81 | #911 460 0016 | Elliot Forbes-Robinson | | 3rd |
| 4.5.1975 | 100 mile Laguna Seca II | 95 | #911 460 9057 | Bob Hagestad | | 24th |
| 8.5.1975 | Renntraining Diepholz | | | Uwe Machel | | ?th |
| 8.5.1975 | Renntraining Diepholz | | | Claus Kathner-Diercks | | ?th |
| 10.5.1975 | 6 h Riverside | 1 | #911 460 9049 | Keyser / Sprowls | Toad Hall/ASCA | 6th |
| 10.5.1975 | 6 h Riverside | 5 | #911 360 0601 | Harmon / Woodner | - | 34th |
| 10.5.1975 | 6 h Riverside | 9 | #911 360 0610 | Bolanos / Jourdain | Toad Hall/ASCA | 9th |
| 10.5.1975 | 6 h Riverside | 23 | #911 360 0727 | Kemp / Baird | Armorall Racing Team | 4th |
| 10.5.1975 | 6 h Riverside | 30 | #911 460 9048 | Dyer / Bienvenue | George Dyer | 30th |
| 10.5.1975 | 6 h Riverside | 43 | #911 560 9112 | O'Steen / Helmick | - | 7th |
| 10.5.1975 | 6 h Riverside | 59 | | Gregg / Haywood | Brumos Porsche | 3rd |
| 10.5.1975 | 6 h Riverside | 61 | #911 560 9122 | Busby / Hiss | Beverly Porsche Audi/Mitcom Inc. | 8th |
| 10.5.1975 | 6 h Riverside | 79 | #911 360 0756 | Callas / Gang | - | 12th |
| 10.5.1975 | 6 h Riverside | 81 | #911 460 0016 | Forbes-Robinson / Minter | Pharr West | 5th |
| 10.5.1975 | 6 h Riverside | 95 | #911 460 9057 | Hagestad / Holbert | Bob Hagestad | 11th |
| 11.5.1975 | MEZ MR CZ Havířov | 13 | | Dušan Velímský | ARC Brno | 4th |
| 11.5.1975 | MEZ MR CZ Havířov | 17 | | Willy Rabl | | 2nd |
| 11.5.1975 | Junioren Trophy Zandvoort | 190 | #004 0005 | Hans Halfmann | Tebernum-Porsche-Racing-Team | 2nd |
| 11.5.1975 | Junioren Trophy Zandvoort | 194 | #911 460 9062 | Günther Chrzanowski | Günther Chrzanowski | 1st |
| 11.5.1975 | Junioren Trophy Zandvoort | 198 | #911 360 0760 | | | DNF |
| 11.5.1975 | Junioren Trophy Zandvoort | | | Claus Kathner-Diercks | Claus Kathner-Diercks | 6th |
| 11.5.1975 | Saarlouis [GT] | | | Richard Leder | Richard Leder | 3rd |
| 11.5.1975 | Mantorp Park | | | Jan Lundgardh | Hässelholms MK | ?th |
| 11.5.1975 | Mantorp Park | | | Roland Larsson | Falkenbergs MK | 2nd |
| 11.5.1975 | Saarlouis [GT] | | #005 0005 | Helmut Kelleners | Jägermeister-Kremer-Team | 1st |
| 11.5.1975 | Saarlouis [Main] | | | Richard Leder | Richard Leder | 2nd |
| 11.5.1975 | Junioren Trophy Zandvoort | | | Ralf-Dieter Schreiber | Ralf-Dieter Schreiber | 4th |
| 11.5.1975 | Junioren Trophy Zandvoort | | #911 460 9023 | Dieter Schornstein | Dieter Schornstein | 3rd |
| 11.5.1975 | Saarlouis [GT] | | | Heinz-Jörgen Dahmen | Heinz-Jürgen Dahmen | 2nd |
| 11.5.1975 | SM Casale | | #911 460 9053 | Edi Kofel | | 3rd |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | 1 | | | | DNE |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | 3 | | | | DNE |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | 4 | | | | DNE |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | 5 | | | | DNE |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | 7 | | | | DNE |
| 18.5.1975 | GP Brno | 9 | | Dušan Velímský | Zetor AMK | DNA |
| 18.5.1975 | Coppa Florio | 47 | #911 460 9067 | Schickentanz / Bertrams / Wisell | Tebernum Porsche Racing Team | 5th |
| 18.5.1975 | Coppa Florio | 48 | #911 560 9121 | Bertrams / Wisell / Schickentanz | Tebernum Porsche Racing Team | 4th |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | | #911 460 9068 | Eugen Kiemele | Eugen Kiemele | ?th |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | | #911 360 0898 | Fritz Müller | Fritz Müller | ?th |
| 18.5.1975 | Coppa Florio | | #911 460 9040 | Hezemans / Fitzpatrick | Gelo Racing Team | DNA |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | | | | | DNF |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | | | | | DNF |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | | #911 460 9078 | Eberhard Sindel | Rallye Gemeinschaft Ulm | DNS |
| 18.5.1975 | Coppa Florio | | #005 0003 | Restivo / Merendino | | DNA |
| 18.5.1975 | DARM Salzburgring [T+2.0/GT] | | | Richard Leder | Richard Leder | ?th |
| 18.5.1975 | Coppa Florio | | | Carducci / Mirto Randazzo | | DNA |
| 19.5.1975 | NTK Zandvoort | 64 | #005 0004 | Cees Siewertsen | Florence Hill | 1st |
| 19.5.1975 | NTK Zandvoort | 72 | | Heinz-Jörgen Dahmen | Porsche Kannacher Krefeld | 2nd |
| 19.5.1975 | NTK Zandvoort | 73 | | Jürgen Kannacher | Porsche Kannacher Krefeld | DNS |
| 25.5.1975 | Euro GT Zeltweg | 1 | #911 460 9040? | John Fitzpatrick | Gelo Racing Team | 8th |
| 25.5.1975 | Euro GT Zeltweg | 2 | | Toine Hezemans | Gelo Racing Team | 10th |
| 25.5.1975 | Euro GT Zeltweg | 3 | #911 460 9052 | Claude Haldi | Porsche Club Romand | 5th |
| 25.5.1975 | Euro GT Zeltweg | 4 | #911 460 9051 | Claude Ballot-Léna | Ecurie Robert Buchet | 3rd |
| 25.5.1975 | Euro GT Zeltweg | 5 | #911 460 9067 | Clemens Schickentanz | Tebernum Porsche Racing Team | 1st |
| 25.5.1975 | Euro GT Zeltweg | 6 | #911 560 9121 | Hartwig Bertrams | Tebernum Porsche Racing Team | 4th |
| 25.5.1975 | Euro GT Zeltweg | 7 | | Kenneth Leim | Team Bla Racing | raced |
| 25.5.1975 | Euro GT Zeltweg | 8 | | Kenneth Leim | Ecurie du Nord | DNA |
| 25.5.1975 | Euro GT Zeltweg | 9 | #911 460 9058 | William Vollery | Gante Racing | DNA |
| 25.5.1975 | Euro GT Zeltweg | 10 | #911 360 1045 | Bengt Ekberg | Team Västkust Stugan | 6th |
| 25.5.1975 | Euro GT Zeltweg | 11 | #911 460 9078 | Eberhard Sindel | Rallyegemeinschaft Ulm | 7th |
| 25.5.1975 | Euro GT Zeltweg | 14 | | Volker Bruchhof | Haralnd Reimann | DNA |
| 25.5.1975 | Euro GT Zeltweg | 16 | #005 0004 | Dieter Quester | Porsche-Kremer Racing | 2nd |
| 25.5.1975 | Euro GT Zeltweg | 17 | | Vittorio Benvenuti | | raced |
| 25.5.1975 | 100 mile Hockenheim | | | Heinz-Jörgen Dahmen | Porsche Kannacher | 1st |
| 25.5.1975 | 100 mile Hockenheim | | #911 460 9068 | Eugen Kiemele | Eugen Kiemele | 2nd |
| 25.5.1975 | 100 mile Hockenheim | | | Gerhard Holup | Gerhard Holup | 3rd |
| 25.5.1975 | 100 mile Hockenheim | | #911 360 1249 | Karl-Heinz Quirin | Karl-Heinz Quirin | 4th |
| 26.5.1975 | 100 mile Lime Rock II | 1 | #911 460 9049 | Michael Keyser | | DNS |
| 26.5.1975 | 100 mile Lime Rock II | 6 | | Hurley Haywood | | DNA |
| 26.5.1975 | 100 mile Lime Rock II | 14 | #005 0009 | Al Holbert | | 1st |
| 26.5.1975 | 100 mile Lime Rock II | 18 | | Bill Schmid | | 11th |
| 26.5.1975 | 100 mile Lime Rock II | 30 | #911 460 9048 | George Dyer | George Dyer | 7th |
| 26.5.1975 | 100 mile Lime Rock II | 43 | #911 560 9112 | John O'Steen | | 6th |
| 26.5.1975 | 100 mile Lime Rock II | 59 | | Peter Gregg | | 2nd |
| 26.5.1975 | 100 mile Lime Rock II | 61 | #911 560 9122 | Jim Busby | | 8th |
| 26.5.1975 | 100 mile Lime Rock II | 74 | #911 560 9123 | Ludwig Heimrath | | 25th |
| 26.5.1975 | 100 mile Lime Rock II | 75 | | Norm Ridgely | | 12th |