We can get a good idea of what scientific research Nissan was up to by going through patents they filed. They did quite a bit of research into knock and MBT (Minimum spark advance for Best Torque) control in the 80's. This talks about the multiple knock control regions: La-Z-Link This one discusses MBT control (aka auto-advance): La-Z-Link This describes the high/low octane mode switching: La-Z-Link
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