 Complete the following phrase:  For 1977, the car was entered by Schmidts ATS Wheels business and run under the name of ATS Racing Team. The ATS-Penske PC4, now painted yellow, debuted in the 1977 United States Grand Prix West with Jean-Pierre Jarier at the wheel, where the Frenchman scored the teams single point of the season. A second PC4 was eventually entered for Hans Heyer who started the 1977 German Grand Prix despite failing to qualify and Hans Binder 3 races but the teams fortunes sank and Schmidt quit after the Italian GP, before returning in 1978 with his own chassis. A third PC4 was built by Penske for Interscope Racing, who entered the car in the United States and 