1976 Porsche 934/5 Kremer Group 4

Following the end of its Can-Am racing venture, Porsche turned to its 911 road-car as the basis for a new competitions programme. Suitably modified, the 911 had become a favourite with privateer entrants in the GT class, but for ultimate success something much more highly developed would be required. 

The factory' first step along this road would be the RSR, based on the production Carrera RS. It immediately proved competitive at World Championship level. Driven by Peter Gregg and Hurley Haywood, an RSR won at Daytona in March 1973, and then two months later the same car was driven to victory in the Targa Florio by Herbert Muller. 

With the regulations for international sports car racing about to change, Porsche sought to exploit the new rules by applying its turbo-charging technology to the car: the result was the Turbo-Carrera. Running in the prototype class, a factory Turbo-Carrera finished 2nd overall at Le Mans in 1975. When the FIA finally agreed the new formula for 1976 it comprised three distinct categories: Group 3 (mass production); Group 4 (limited production); and Group 5 (extensively modified). 

For Group 4 competition Porsche offered the suitably modified Type 934 customer car, while for Group 5's 'silhouette formula' the factory developed the Type 935. Despite a season of mixed results, the highlights of which were wins at Mugello, Vallelunga, and Watkins Glen, plus 4th place at Le Mans, the World Championship of Makes was finally secured with victory in the final round at Dijon. 

Bonhams will be offering this example at their upcoming Spa Classic Sale between the 21st May, its estimated value is between £270,000 – £340,000. For more information on this and other vehicles at the sale, click on the link below. Photos courtesy of Bonhams.