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what's your trans code? if it's from an October 1989 RS with the W5M33 transmission, it's going to be expecting a 3.909 rear diff ratio.. if you have a KM225/C50/C51 trans then you have the earlier 3.545 trans.
That's not a JDM RS transmission - that's a 1G DSM AWD trans which would match your stock 3.545 rear end. I think the DSM runs taller tyres stock than the GVR-4 so maybe that's where your inaccuracy comes from.
A DSM transmission is set to run with tires that are just over 1/2" taller than the stock GVR4 ratio. So, you will have speedo issues unless you run a ratio that equals the 1g DSM standard of 205/55r16, or a 631.5mm tall tire.
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