Porsche 934/5 racing at Spa, Nürburgring and Monza
Based on the newly introduced 911 Turbo (930), Porsche first created a Group 5 competition car (935) and then readied a Group 4 version (934) for the 1976 season. In addition to the obvious mechanical differences, the 934 would be available to Porsche’s customers, whereas the 935 was raced exclusively by the works team. As such the 934 replaced the highly successful 911 Carrera RSR.
During the 1976 season, several Porsche customers modified their 934s to Group 5 specification and Porsche catered to their needs by producing a batch of 935s for the 1977 season. These were still not allowed to run in the IMSA series but the door had been opened for the 934. Accordingly, Porsche built a further ten 934s with wider wheel-arches and a much more substantial rear wing. Known as the 934½, these were raced with great success in North America.