In January 1977 Lunger announced that he had signed with BS Fabrications, an English race team, and manufacturer of race car components. He fielded a McLaren M23, the same car driven by James Hunt when he won the 1976 Formula One World Championship. In his first race of the season, Lunger finished 14th in the 1977 South African Grand Prix driving a March-Ford. The week prior to the race he lost a right rear wheel and crashed. It took his crew a week to rebuild the car from the ground up. During qualifying he drove three timed laps before his car blew an engine. This meant that Lunger started the race at the rear. Lunger qualified his March on the 11th row, 21st starting position for the 1977 United States Grand Prix West. He did not complete the race after he was in an accident on the 4th lap. He drove a McLaren to a 19th-place finish in the 1977 German Grand Prix at Hockenheim. Lunger qualified 17th in Zeltweg for the 1977 Austrian Grand Prix. He had a time of 1 minute, 41.40 seconds. He placed 9th at Zandvoort in the 1977 Dutch Grand Prix. His McLaren was 2 laps behind winner Lauda. Lunger was 10th, 2 laps down, at the 1977 United States Grand Prix.