It took 50 races from 50 starts from 1991--1897 (latterly R33) in the blighted by the R32 GT-R, and splintered soon after, leading to the switch to the Supertouring category and also indirectly to the GT500 category of today.
It took 50 races from 50 starts from 1991--1997 (latterly R33) in the N1 Super Taikyu. JTCC was similarly blighted by the R32 GT-R, and splintered soon after, leading to the switch to the Supertouring category and also indirectly to the GT500 category of today.