sentences:  In 1964, Prince had entered their new S54 Skyline GTs in the second Japanese Grand Prix, hoping to prove the performance potential of the car's new G-7 Straight-6.Although the cars performed well, they were defeated by a privately entered Porsche 904 GTS, leaving the Skylines to take second through sixth positions.Realizing the superiority of the mid-engine layout used on the Porsche 904, Prince decided that a custom-built sports car would be needed to win the Japanese Grand Prix.