Here's the long and short of it. Nissan's 17 digit VIN number has a character in it that denotes model year. The JDM cars don't have 17 digit VINs. It was replaced by that weak "Chassis No". The "Model" can be partially decoded based on USA codes. RPS13 = hatchback, turbo SR, S13. J=? F = 5sp, also denoted as FS5W71C below that. T and M = ? C = air con. W = sun roof. 29 = trim package, which was probably the top level since it was a turbo car.

The color KG2 is Dark Grey or Gunmetal-ish. G means that the interior was Black. SR20 (DET) 1998 means, of course, that you have an SR and that it displaces 1998cc. This is commonly mistaken for the model year, which is why you see so many people claiming that they have a 1998 year motor. FS5W71C is the code for the 5sp trans, which dates back to the original Z's and the FS4. RC40 is the rear end ratio, which in this case was 4.0:1, or actually 4.083:1. RC43 cars have a 4.363:1 ratio. W is the Kyushu plant, which is where all (including US ones) S13's were built.

So the bottom line. That chassis number is pretty low, so I'd have to say 90 or 91.