Found some footage of it and while it (of course) is very primitive in comparison to current titles, it certainly looks like it was a strong challenge to GT on the PS. Never even heard of it before.
Even had a 'cockpit cam'.
It's good, I owned the game as well as GT series on PSX
I'm playing it now on the laptop that I used to type this, using PSX emulator with Iso made from the disc. Taking R33 GTST to Mine circuit, fitting Advan Neova tire 225/45/17 front and 245/40/17 tire ( there are several street tire level, M5GP, M7R and Neova ), each car has variety of tire width and size choices, mix different size or compound possible. I should also mention there's night racing, rain, misty, sunny, etc and fuel consumption. Tires have 4 parameter, dry grip, wet grip, drain, control and consume. Turbo boost can be adjusted. Racing cars ( JGTC, JTCC ) have different tires as well, slick ( H,M,S Inter, Rain ) and can be mixed, front M, rear S etc. One of my go to car is Taisan Starcard Porsche 993 GT2 and Club Japan Ferrari F355, there are also Chasers, Exiv, Accord from JTCC days. Tuned road car also available, 500+HP R32 GTR, R33 GTR etc.
Up to 16 cars in a race ( can be adjusted as well ), rain racing at Mine using R33 GTST, even with 250PS, racing it feels great for old PSX game, the AI is a bit dumb though at times
It's still boggles me, PD never tried to approach tire company and make them official tire, with proper simulation on PS3 era ... Advan with Atlus did it back in the 90's even on weak PSX, still good effort and driving feels good for it's age ( I'm using DS2 with D-pad
)