| 5.2.1978 | 24 h Daytona | 07 | #911 560 9114 | Cowart / Mendez / Castellano | Morrison's Porsche | 36th |
| 5.2.1978 | 24 h Daytona | 24 | #911 460 9056 | Frank / Bergstrom | Executive Industries | 15th |
| 5.2.1978 | 24 h Daytona | 32 | #911 460 9048 | Earle / Akin / Knoop | Earle/Akin Racing Associates Inc. | 7th |
| 5.2.1978 | 24 h Daytona | 33 | #911 460 9113 | Fernandez / Paul / Currin | Boricua Racing | 4th |
| 5.2.1978 | 24 h Daytona | 39 | | Pickett / Bonnet / Canepa | Pickett Racing | 62nd |
| 5.2.1978 | 24 h Daytona | 46 | #911 360 0915 | DeNarvaez / Naon / Garcia | Mauricio DeNarvaez | 20th |
| 5.2.1978 | 24 h Daytona | 54 | #911 460 0100 | Tunstall / Behr / Timolat | T&C/Big Apple Racing | 61st |
| 25.2.1978 | Stuttgart Preis Hockenheim | | | Klaus Utz | Hahn-Sportwagen-GmbH | ?th |
| 25.2.1978 | Stuttgart Preis Hockenheim | | | Marco Vanoli | | ?th |
| 12.3.1978 | DRM Zolder Bergischer Löwe | 22 | | Fritz Müller | Fritz Müller | DNA |
| 12.3.1978 | National Montlhéry [Gr.3/Gr.4] | 40 | #911 360 0643 | Georges Bourdillat | | 1st |
| 12.3.1978 | National Montlhéry [Gr.3/Gr.4] | 42 | #911 350 1121? | Anny-Charlotte Verney | | DNA |
| 18.3.1978 | 12 h Sebring | 07 | #911 560 9114 | Cowart / Craw / Castellano | Morrison's Inc. | 28th |
| 18.3.1978 | 12 h Sebring | 3 | | Freeman / Harmon / Leydecker | Bill Freeman Racing | 54th |
| 18.3.1978 | 12 h Sebring | 8 | #911 460 0035 | Beasley / Jennings | Robert Beasley | 62nd |
| 18.3.1978 | 12 h Sebring | 24 | #911 460 9056 | Frank / Bergstrom | Executive Industries | 50th |
| 18.3.1978 | 12 h Sebring | 32 | #911 460 9048 | Earle / Akin / Knoop | Earle & Akin Racing | 5th |
| 18.3.1978 | 12 h Sebring | 33 | #911 460 9113 | Paul / Fernandez | JLP Racing | 4th |
| 18.3.1978 | 12 h Sebring | 46 | #911 360 0915 | DeNarvaez / Naon | Mauricio De Narvaez | 51st |
| 18.3.1978 | 12 h Sebring | 60 | | Berner / Goebbels | Motex Automotive | DNA |
| 18.3.1978 | 12 h Sebring | 68 | #005 0009 | Mendez / Rodriguez / Lopez | Luis Mendez | DNA |
| 18.3.1978 | 12 h Sebring | 91 | | Frank / Schramm | Framm Promotions/W. Frank | 34th |
| 19.3.1978 | 6 h Mugello | 14 | | Kristoffersen / Sindel | Wrangler Racing | DNF |
| 2.4.1978 | 6 h Talladega | 07 | #911 560 9114 | Dave Cowart | Morrison's Inc. | DNA |
| 2.4.1978 | 6 h Talladega | 32 | #911 460 9048 | Earle / Akin | Earle & Akin Racing Associates | 5th |
| 2.4.1978 | 6 h Talladega | 33 | #911 460 9113 | Fernandez / Cowart | Boricua Racing | 4th |
| 2.4.1978 | 6 h Talladega | 46 | #911 360 0915 | DeNarvaez | Mauricio DeNarvaez | 38th |
| 2.4.1978 | National Montlhéry [Gr.4/Gr.5/Gr.6] | 53 | | Georges Bourdillat | | DNA |
| 2.4.1978 | Marlboro Cup Zolder | 77 | | Pit Weirig | | DNA |
| 16.4.1978 | 100 mile Road Atlanta | 07 | #911 560 9114 | Dave Cowart | Morrison's Inc. | 13th |
| 16.4.1978 | 100 mile Road Atlanta | 8 | #911 460 0035 | Bob Beasley | Bob Beasley | 16th |
| 16.4.1978 | 100 mile Road Atlanta | 33 | #911 460 9113 | Bonky Fernandez | Boricua Racing | 15th |
| 16.4.1978 | 6 h Dijon | 34 | #911 460 9059 | Bourdillat / Bernard | ASA Cachia | 12th |
| 16.4.1978 | 6 h Dijon | 37 | #911 350 1121? | Verney / Striebig | Anny-Charlotte Verney | 15th |
| 16.4.1978 | 100 mile Road Atlanta | 46 | #911 360 0915 | Mauricio DeNarvaez | Mauricio DeNarvaez | 39th |
| 16.4.1978 | 100 mile Road Atlanta | 60 | #005 0009 | Luis Mendez | Mendez Racing | 17th |
| 16.4.1978 | 100 mile Road Atlanta | 91 | | Werner Frank | Framm Promotions | 19th |
| 16.4.1978 | DARM Hockenheim | | | Fritz Müller | Fritz Müller | ?th |
| 23.4.1978 | GP Zolder | 77 | | Pit Weirig | Screen-Center | DNA |
| 23.4.1978 | SM Dijon [Gr.4/Gr.5] | | | Marco Vanoli | | 4th |
| 30.4.1978 | 100 mile Laguna Seca | 07 | #911 560 9114 | Dave Cowart | Morrison's Inc. | 12th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 28 | | Matthias Lörper | Norddeutscher-Automobilclub | 17th |
| 30.4.1978 | 100 mile Laguna Seca | 28 | | Clif Kearns | Desperado Racing | 20th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | 30 | | Klaus Utz | Hahn Sportwagen GmbH | DNF |
| 30.4.1978 | 100 mile Laguna Seca | 55 | #911 560 9121 | Howard Meister | | 11th |
| 30.4.1978 | DRM Nürburgring Eifelrennen | | | Jürgen Konrad | | 11th |
| 7.5.1978 | 100 mile Hallett | 07 | #911 560 9114 | Dave Cowart | Morrison's Inc. | 9th |
| 7.5.1978 | 100 mile Hallett | 55 | #911 560 9121 | Howard Meister | | 6th |
| 7.5.1978 | 100 mile Hallett | 91 | | Werner Frank | Framm Promotions | 7th |
| 7.5.1978 | Jan Wellem Nürburgring | | #911 230 0908 | Georg Freiberger | Georg Freiberger | ?th |
| 14.5.1978 | 6 h Silverstone | 35 | #911 460 9059 | Bourdillat / Bernard | A.S.A. Cachia | 12th |
| 15.5.1978 | DARM Saarlouis | | | Fritz Müller | Müllerbräu/Valvoline-Racing | ?th |
| 15.5.1978 | DARM Saarlouis | | | Erich Schiebler | Erich Schiebler | 3rd |
| 21.5.1978 | Trans-Am Sears Point | 24 | #911 460 9056 | Tom Frank | Executive Industries | 2nd |
| 28.5.1978 | 1000 km Nürburgring | 43 | #911 230 0908 | Konrad / Freiberger | Porsche-Kremer-Racing | 15th |
| 28.5.1978 | 1000 km Nürburgring | 49 | | Lörper / Oppermann / Beise | Norddeutscher Automobilclub e. V. | 22nd |
| 28.5.1978 | 1000 km Nürburgring | 57 | | Müller / Hechler | Müllerbräu-Valvoline-Racing | DNF |
| 29.5.1978 | 100 mile Lime Rock | 07 | #911 560 9114 | Dave Cowart | Morrison's Inc. | 10th |
| 29.5.1978 | 100 mile Lime Rock | 55 | #911 560 9121 | Howard Meister | | 11th |
| 4.6.1978 | Trans-Am Westwood | 24 | #911 460 9056 | Tom Frank | Executive Industries | 20th |
| 4.6.1978 | DARM Zolder | | | Erich Schiebler | Erich Schiebler | 1st |
| 4.6.1978 | DARM Zolder | | | Fritz Müller | Müllerbräu-Valvoline-Racing | ?th |
| 11.6.1978 | Trans-Am Portland | 24 | #911 460 9056 | Tom Frank | Executive Industries | 9th |
| 11.6.1978 | Trans-Am Portland | 47 | #911 460 0059 | Bill Hanel | Hanel Racing | 3rd |
| 11.6.1978 | 24 h Le Mans | 64 | #911 360 0643 | Bourdillat / Bernard / Favresse | Georges Bourdillat | NC |
| 11.6.1978 | 24 h Le Mans | 66 | #911 350 1121? | Verney / Lapeyre / Servanin | Anny-Charlotte Verney | 12th |
| 11.6.1978 | DARM Wunstorf | | | Fritz Müller | Müller-Bräu-Valvoline-Racing | ?th |
| 18.6.1978 | 100 mile Brainerd | 07 | #911 560 9114 | Dave Cowart | Morrison's Inc. | 8th |
| 18.6.1978 | DRM Mainz-Finthen | 30 | #911 360 1164 | Klaus Böhm | Klaus Böhm | 10th |
| 18.6.1978 | DRM Mainz-Finthen | 31 | | Peter Schem | Peter Schem | 9th |
| 18.6.1978 | DRM Mainz-Finthen | 32 | #911 230 0908 | Georg Freiberger | Georg Freiberger | 11th |
| 18.6.1978 | 100 mile Brainerd | 38 | #911 460 9113 | Bonky Fernandez | Boricua Racing | 10th |
| 18.6.1978 | 100 mile Brainerd | 52 | | Tom Tuohy | | 16th |
| 18.6.1978 | 100 mile Brainerd | 55 | #911 560 9121 | Howard Meister | | 26th |
| 18.6.1978 | 100 mile Brainerd | 91 | | Werner Frank | Framm Promotions | 13th |
| 1978 | 6 h Dakar | 9 | | Jahn / Utz | | DNA |
| 1978 | 100 laps Magny-Cours | 47 | #911 350 1121? | Verney / Lapeyre | | 1st |
| 1978 | 100 laps Magny-Cours | | #911 360 0643 | Bourdillat / Bernard | | 2nd |