The "spazzaneve" project was discarded and replaced by a new design, still named 312 B3. A new full monocoque chassis was built by specialist English company TC Prototypes, under John Thompson's guidance, and the engine became a fully stressed member. In the first races, Ferrari still used the old 312 B2: the car was no longer competitive, and Ickx only managed one fourth place at the opening GP of the season. The new 312 B3 debuted at the Spanish round, but proved to be slow and unreliable achieving even worse results. In addition to the sports cars, which were beaten by the French Matra, the F1 program of the Italian team was outclassed, and they even skipped some F1 races, notably the Nürburgring. This was not acceptable to Ickx, because the Nürburgring where the German Grand Prix was being held that year was his favorite race track. As a result, he left the team halfway through the season in order to contest the 1973 German Grand Prix at the Nürburgring in a McLaren, where he took 3rd place behind the Tyrrells of Stewart and François Cevert, despite being given an older-spec Ford Cosworth V8 and the hardest compound of tyres available. During the summer Forghieri was recalled as technical director and set about revising the B3 incorporating some of the ideas used on his radical "spazzaneve". For 1974 Ferrari fielded a heavily revised car, named 312 B3-74, and signed BRM drivers Niki Lauda and Clay Regazzoni. The car was succeeded by the 312T which was introduced for the 1975 Formula One season. In 1975, 63.5 points were scored driving the Ferrari 312T.