Since most older Japanese cars use the JECS ECUs it would be fair to say they all use this method of 'self learn' Where the OEM ECU has a nice safety margin you can inadvertently advance the timing into knock with any additional timing added during tuning then once the car hits the road it tries to advance it's own timing using its IAM it means it's never giving a consistent ignition so essentially the ECU is having to work a lot harder than it was originally designed and could swing way out of its operating parameters. When you reset the ECU to reset the fuel trims you also reset this IAM. If you tune a piggy back such as the emanage with this IAM at zero it will continue to advance the timing during and after the tune.
The timing is what I found the worst controlled by piggy back systems, for example the standard Subaru ECU had a IAM (ignition advance multiplier),which advances the timing. The E-Manage gets called the Mismanage around here but people still insist on using them. I would agree that Link would be the best option for the car, if you can't afford it then hold back on modifications and save up for it. The unfortunate thing with the Nistune is that they done have a board for the R33 GTS, you need to source a 300ZX ECU and Nistune that ECU.
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