| 16.4.1978 | Benelux Zandvoort | 73 | 935 | Claude Bourgoignie | | raced |
| 16.4.1978 | Benelux Zandvoort | 74 | 935 | Henri van Oorschot | Henri van Oorschot | 1st |
| 16.4.1978 | Benelux Zandvoort | 75 | 935 | Toon Suykerbuyk | | 2nd |
| 16.4.1978 | DARM Hockenheim | | 911 Carrera RS | Richard Weber | R. Weber | 4th |
| 16.4.1978 | DARM Hockenheim | | 911 Carrera | Klaus Utz | Klaus Utz | ?th |
| 16.4.1978 | DARM Hockenheim | | 911 Carrera RS | Jürgen Lässig | Autohaus Max Moritz GmbH | ?th |
| 16.4.1978 | DARM Hockenheim | | 911 Carrera RSR | Fritz Müller | Fritz Müller | ?th |
| 16.4.1978 | DARM Hockenheim | | 911 Carrera | Hans Großmann | Sports Car Club of Stuttgart | 3rd |
| 16.4.1978 | DARM Hockenheim | | 911 Carrera | Erich Schiebler | Erich Schiebler | 1st |
| 16.4.1978 | SM Monza | | 911 Carrera | Athos Severi | | ?th |
| 16.4.1978 | DARM Hockenheim | | 911 Carrera | Karl-Josef Römer | Karl-J. Römer | ?th |
| 22.4.1978 | Giro dell'Umbria | | | di Gioia | | ?th |
| 23.4.1978 | 320 km Monza | 3 | 908/3 Turbo | Reinhold Jöst | Liqui Moly Equipe | 1st |
| 23.4.1978 | GP Zolder | 72 | 934 | Willy Braillard | Jean Pierre Gaban | 1st |
| 23.4.1978 | GP Zolder | 73 | 935 | Claude Bourgoignie | Team Willeme | raced |
| 23.4.1978 | GP Zolder | 74 | 935 | Henri van Oorschot | Scorpio Racing | raced |
| 23.4.1978 | GP Zolder | 75 | 935 | Toon Suykerbuyk | Scorpio Racing | raced |
| 23.4.1978 | GP Zolder | 76 | 935 K | John Lagodny | Screen-Center | 2nd |
| 23.4.1978 | GP Zolder | 77 | 911 Carrera RSR | Pit Weirig | Screen-Center | DNA |
| 23.4.1978 | GP Zolder | 91 | 911 Carrera RS | "Alex" | Excelsior Rombouts Rizla | DNA |
| 23.4.1978 | SM Dijon [Gr.4/Gr.5] | | 911 Carrera RSR | Marco Vanoli | | 4th |
| 23.4.1978 | SM Dijon [Gr.4/Gr.5] | | 911 Carrera | Sarteur | | 7th |
| 23.4.1978 | SM Dijon [Gr.4/Gr.5] | | 934 | Enzo Calderari | | 2nd |
| 23.4.1978 | SM Dijon [Gr.4/Gr.5] | | 911 Carrera RSR 3.0 | Edy Brandenberger | | 1st |
| 30.4.1978 | 100 mile Laguna Seca | 0 | 935/77A | Danny Ongais | Interscope Racing | DNS |
| 30.4.1978 | 100 mile Laguna Seca | 00 | 935/77A | Ted Field | Interscope Racing | 10th |
| 30.4.1978 | 100 mile Laguna Seca | 07 | 911 Carrera RSR | Dave Cowart | Morrison's Inc. | 12th |
| 30.4.1978 | Laguna Seca [GTU] | 1 | 911 | Jim Gaeta | | 14th |
| 30.4.1978 | Laguna Seca [GTU] | 2 | 911 S | Tom Masterson | Tom Masterson | 10th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 2 | 935/77A | Bob Wollek | Vaillant-Kremer-Team | 4th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 3 | 935/77A | Dieter Schornstein | Porsche-Kremer-Racing | 10th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 4 | 935 K2 | "John Winter" | Porsche-Kremer-Racing | DNF |
| 30.4.1978 | 100 mile Laguna Seca | 5 | 911 Carrera RSR | Harmon / Leydecker | Robert Harmon | DNA |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 5 | 935/77A | Manfred Schurti | Jägermeister-Max-Moritz-Team | 8th |
| 30.4.1978 | 100 mile Laguna Seca | 6 | 935 | Bob Bondurant | Barbour Performance | 17th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 6 | 935/77A | Toine Hezemans | Weisberg-Gelo-Team | 1st |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 8 | 935/77A | John Fitzpatrick | Weisberg-Gelo-Team | 2nd |
| 30.4.1978 | 100 mile Laguna Seca | 9 | 935/77A | Dick Barbour | Barbour Performance | 6th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 9 | 935/77A | Klaus Ludwig | Weisberg-Gelo-Team | 3rd |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 10 | 935/77A | Franz Konrad | Konrad-Racing | 5th |
| 30.4.1978 | Laguna Seca [GTU] | 11 | 911 S | Bobbee Nylander | Gary Nylander | 18th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 11 | 935/77A | Reinhold Jöst | Liqui-Moly-Equipe | DNF |
| 30.4.1978 | 100 mile Laguna Seca | 13 | 935 | Hal Shaw, Jr. | Ore House Vail/Bankrupt Inc Racing | 13th |
| 30.4.1978 | Laguna Seca [GTU] | 13 | 914/6 | Darrel Overstreet | Darrel Overstreet | DNA |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 16 | 935 | Volkert Merl | Konrad-Racing | 6th |
| 30.4.1978 | 100 mile Laguna Seca | 16 | 935/77A | George Follmer | Vasek Polak Racing | 1st |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 18 | 935 | Klaus Drees | Klaus Drees | 9th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 19 | 935 | Claude Haldi | Meccarillos Racing Team | 7th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 20 | | Edgar Dören | Edgar Dören | DNA |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 21 | 911 Carrera RS | Karl-Josef Römer | Karl-Josef Römer | 14th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 22 | 911 Carrera RSR 3.0 | Georg Freiberger | Porsche-Kremer-Racing | unused |
| 30.4.1978 | Laguna Seca [GTU] | 23 | 914/6 | Bob Zulkowski | Bob Zulkowski | 11th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 23 | 911 Carrera RS | Gerhard Happel | Norddeutscher-Automobilclub e. V. | 12th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 24 | 911 Carrera | Hans Großmann | Sports Car Club of Stuttgart e. V. | 16th |
| 30.4.1978 | 100 mile Laguna Seca | 25 | 935 | Paul Miller | Vasek Polak Racing | DNA |
| 30.4.1978 | Laguna Seca [GTU] | 26 | 911 | Angel Nardi | Angel Nardi | 24th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 26 | 911 Carrera RS | Jürgen Lässig | Autohaus Max-Moritz GmbH | DNA |
| 30.4.1978 | 100 mile Laguna Seca | 28 | 911 Carrera RSR | Clif Kearns | Vasek Polak Racing | 20th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 28 | 911 Carrera RSR | Matthias Lörper | Norddeutscher-Automobilclub | 17th |
| 30.4.1978 | 100 mile Laguna Seca | 30 | 935 | Gianpiero Moretti | Electrodyne | 7th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 30 | 911 Carrera RSR | Klaus Utz | Hahn Sportwagen GmbH | DNF |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 31 | 911 Carrera | Armin Jahn | Hahn Sportwagen GmbH | DNA |
| 30.4.1978 | 100 mile Laguna Seca | 31 | 911 SC | Greg LaCava | Greg LaCava | 18th |
| 30.4.1978 | Laguna Seca [GTU] | 45 | 911 | Gary Steele | Gary Steele | 13th |
| 30.4.1978 | Laguna Seca [GTU] | 51 | 911 S | John Hotchkis | John Hotchkis | 6th |
| 30.4.1978 | 100 mile Laguna Seca | 55 | 911 Carrera RSR | Howard Meister | Andial Porsche-Meister Homes | 11th |
| 30.4.1978 | Laguna Seca [GTU] | 58 | 911 | Nick Feodorhoff | Nick Feodorhoff | 15th |
| 30.4.1978 | 100 mile Laguna Seca | 59 | 935/77A | Peter Gregg | Brumos Porsche Audi | 3rd |
| 30.4.1978 | Laguna Seca [GTU] | 62 | 914/6 | Bill Koll | William Koll | 12th |
| 30.4.1978 | Laguna Seca [GTU] | 64 | 911 S | Dennis Aase | Dennis Aase | 21st |
| 30.4.1978 | Laguna Seca [GTU] | 76 | 911 | Frank Thomas | Quality Inn of Boise | 4th |
| 30.4.1978 | Laguna Seca [GTU] | 82 | 914/6 | Rodd Harrison | Schneider Autohaus | 3rd |
| 30.4.1978 | 100 mile Laguna Seca | 93 | 934/5 | Don Whittington | Whittington Bros. | 24th |
| 30.4.1978 | 100 mile Laguna Seca | 94 | 935/77A | Bill Whittington | Whittington Bros. | 14th |
| 30.4.1978 | 100 mile Laguna Seca | 95 | 935 | Hurley Haywood | Vasek Polak Racing | 2nd |
| 30.4.1978 | DRM Nürburgring Eifelrennen | | 911 Carrera RSR | Jürgen Konrad | | 11th |
| 30.4.1978 | SM Hockenheim | | 934 | Peter Zbinden | | ?th |
| 30.4.1978 | SM Hockenheim | | 911 Carrera RSR 3.0 | Edy Brandenberger | | raced |
| 7.5.1978 | 100 mile Hallett | 00 | 935/77A | Ted Field | Interscope Racing | 17th |
| 7.5.1978 | Hallett [GTU] | 01 | 911 S | Dave White | | 3rd |
| 7.5.1978 | 100 mile Hallett | 07 | 911 Carrera RSR | Dave Cowart | Morrison's Inc. | 9th |
| 7.5.1978 | 100 mile Hallett | 30 | 935 | Gianpiero Moretti | Electrodyne Inc. | 3rd |
| 7.5.1978 | Hallett [GTU] | 34 | 911 S | George Drolsom | Drolsom Racing | 8th |
| 7.5.1978 | Hallett [GTU] | 42 | 911 S | Tom Ashby | | 9th |
| 7.5.1978 | Hallett [GTU] | 45 | 911 | Gary Steele | | 5th |
| 7.5.1978 | Hallett [GTU] | 51 | 911 S | Dennis Aase | | 1st |
| 7.5.1978 | 100 mile Hallett | 55 | 911 Carrera RSR | Howard Meister | | 6th |
| 7.5.1978 | 100 mile Hallett | 59 | 935/77A | Peter Gregg | Brumos Porsche | 13th |
| 7.5.1978 | Colmar-Berg | 76 | 935 K | John Lagodny | | 1st |
| 7.5.1978 | Hallett [GTU] | 76 | 911 | Frank Thomas | | 13th |
| 7.5.1978 | Hallett [GTU] | 82 | 914/6 | Rodd Harrison | | 4th |
| 7.5.1978 | Hallett [GTU] | 85 | 914/6 | John Hulen | John Hulen | 10th |
| 7.5.1978 | 100 mile Hallett | 91 | 911 Carrera RSR | Werner Frank | Framm Promotions | 7th |
| 7.5.1978 | 100 mile Hallett | 93 | 934/5 | Bill Whittington | Whittington Brothers | 4th |
| 7.5.1978 | 100 mile Hallett | 94 | 935/77A | Don Whittington | Whittington Brothers Racing | 12th |
| 7.5.1978 | Belgium Spa | | 934 | Willy Braillard | | 1st |
| 7.5.1978 | Interserie Colmar-Berg | | 908/3 Turbo | Reinhold Jöst | Liqui Moly Equipe | 1st |
| 7.5.1978 | Jan Wellem Nürburgring | | 911 Carrera | Hans Großmann | Sports Car Club of Stuttgart | ?th |
| 7.5.1978 | Jan Wellem Nürburgring | | 911 Carrera RSR | Georg Freiberger | Georg Freiberger | ?th |
| 7.5.1978 | Interserie Colmar-Berg | | 908/3 Turbo | Bob Wollek | Porsche Kremer Racing | 2nd |