I just remembered Enthusia Professional Racing by Konami(by reading the name Ephemeral Fantasia), if that game isn't obscure it is at least very forgotten, this is the entirety of its Wikipedia page:
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It was a good driving sim but it had some stiff competition, three months before it's release Gran Turismo 4 came out. On the same day of its release the first Forza came out. Oof.
It was a different type of game though, physics was one of the selling points and it had a HUD when playing that showed the inertia on the car, traction for each tire and the wheel position, in addition to that there were a couple of bars that showed the pressure on gas and brake.
It also had its own version of Forza's dynamic driving line, but only in practice mode.
Compared to GT and Forza it felt a little bare-bones, it didn't look that great compared to them either, but the racing itself was really good.