O Campeonato Mundial de Marcas de 1978 foi regulamentado apenas para a categoria GT, excluindo os prototipos da disputa. Mais uma vez sem Le Mans, o ano foi dominado inteiramente pelo Porsche 935, que ganhou as 8 provas validas pelo campeonato tendo um pouco de concorrencia por parte da BMW com seu modelo 320i.Os pilotos que contribuiram para o titulo da Porsche foram Rolf Stommelen, Toine Hezemans, Peter Gregg, Toine Hezemans, John Fitzpatrick, Heyer, Bob Wollek, Henri Pescarolo, Jochen Mass, Jacky Ickx e Klaus Ludwig.24 Horas de Daytona - Data: 5.2.1978(round 1)1st 99 Rolf Stommelen/Toine Hezemans/Peter Gregg - Porsche 935/77A2nd 6 Dick Barbour/Manfred Schurti/Johnny Rutherford - Porsche 935/77A3rd 58 Diego Febles/Poole - Porsche Carrera RSR4th 33 Fernandez / Paul / Currin - Porsche Carrera RSR5th 14 Brambring/Schornstein/John Winter - Porsche 935 K26th 09 Belcher/Bundy/Al Holbert - Porsche 934/57th 32 Earle / Akin / Knoop - Porsche Carrera RSR8th 65 Morton / Adamowicz / Sahlman / Carradine - Ferrari 365 GTB/49th 59 Peter Gregg/Claude Ballot-Lena/Frisselle - Porsche 93510th 13 Hal Shaw, Jr./Busby/Meister - Porsche 935Data: 19.3.1978 -6 horas de Mugello(round 2)1st 12 Toine Hezemans/John Fitzpatrick/Heyer - Porsche 935/77A2nd 15 Franz Konrad/Reinhold Jost/Merl - Porsche 935/77A3rd 31 Dieter Quester/Derek Bell - BMW 320i4th 22 Haldi/Herbert Muller - Porsche 9355th 3 Finotto / Facetti - Porsche 9356th 23 Emanuelsson / Olofsson - BMW 320 BMW7th 8 Schornstein/John Winter/Bob Wollek - Porsche 935 K28th 21 Maurizio Micangeli/Pietromarchi - De Tomaso Pantera9th 11 John Fitzpatrick/Klaus Ludwig/Toine Hezemans - Porsche 935/77A10th 32 Neve / Grohs - BMW 320Data: 16.4.1978 - 6 horas de Dijon-Prenois (round 3)1st 2 Bob Wollek/Henri Pescarolo - Porsche 935/77A2nd 5 John Fitzpatrick/Toine Hezemans/Heyer - Porsche 935/77A3rd 21 Francia/Eddie Cheever - BMW 320i4th 23 Emanuelsson / Carlsson - BMW 3205th 9 Lafosse/Claude Ballot-Lena - Porsche 9356th 3 Schornstein/John Winter - Porsche 935/77A7th 24 Marc Surer/Kottulinsky - BMW 3208th 31 Pallavicini / Calderari / Bernhard - Porsche 9349th 36 Simonsen/Kenneth Leim - Porsche 93410th 12 Kauwertz/Klaus Drees/Hahnlein - Porsche 9356 Horas de Silverstone - Data: 14.5.1978(round 4)1st 1 Jochen Mass/Jacky Ickx - Porsche 935/782nd 8 Bob Wollek/Henri Pescarolo - Porsche 935/77A3rd 53 Joosen / Grohs - BMW 3204th 54 Kottulinsky / Hotz - BMW 3205th 9 Schornstein/John Winter/Bob Wollek - Porsche 935 K26th 11 Franz Konrad/Merl - Porsche 935/77A7th 25 Sindel / Kristoffersen - Porsche 9348th 24 Pallavicini / Bernhard - Porsche 9349th 31 Raymond/Beasley/Simon Phillips - Porsche Carrera RSR10th 32 Neville / Wingrove / Lovett - Porsche Carrera RSR1000 Km de Nurburgring - Data: 28.5.1978(round 5)1st 3 Klaus Ludwig/Toine Hezemans/Heyer - Porsche 935/77A2nd 8 Manfred Schurti/Jacky Ickx - Porsche 935/77A3rd 4 Bob Wollek/Henri Pescarolo - Porsche 935/77A4th 12 Merl/Schreiber/Franz Konrad - Porsche 9355th 7 Reinhold Jost/Jurgen Barth - Porsche 935/77A6th 34 Hottinger/Hans Stuck - BMW 3207th 29 Dieter Quester/Ronnie Peterson - BMW 3208th 11 Franz Konrad/Merl/Schickentanz - Porsche 935/77A9th 26 Neve / Grohs - BMW 32010th 10 Fischhaber / Feitler - Porsche 9346 horas de Misano - Data: 25.6.1978(round 6)1st 7 Bob Wollek/Henri Pescarolo - Porsche 935/77A2nd 23 "Victor" / Monticone - Porsche 9353rd 12 Franz Konrad/Merl - Porsche 935/77A4th 2 Neve / Grohs -