Last month, Japan's top single-seater series announced it would be holding a series of tests either before or after each race weekend in the 2022 season with two development cars, to be driven by retired two-time champion Hiroaki Ishiura and fellow veteran Koudai Tsukakoshi.
Ishiura and Tsukakoshi respectively drove the cars affectionately known as 'red tiger' and 'white tiger', a reference to their colour schemes, during two days of running on Wednesday and Thursday at Fuji.
