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The stock knock system does not function in real time at peak torque and beyond.
If the ECU is tuned for performance and you add a boost controller, you are re-mapping the timing and fuel tables for performance and safety for the new boost level. Your timing in the higher RPM maps is set much lower to make the tune safe for higher boost.
Because the ECU does not work in real TIME where you need it most at peak torque and beyond, if you allow the ECU knock system to FULLY function, it will pull power on top when no knock is present simply because it had tip in knock from lugging the engine at low RPM. If it really does knock at peak torque and above, the stock system will not provide any protection if it receives no knock in the lower RPM regions. A fully functioning stock knock system only makes changes to the top RPM based on how you loaded the engine in the lower RPM area.
Nissan did try to provide protection for the factory set up 25 years ago, But they had to add VOO DOO to the program because they could not control knock in real time at higher RPM.On a modified Z, a well tuned ECU is not going to have knock issues that are dangerous to the engine in the areas the stock knock system can handle. The areas that are not supported are where your likely to have detonation that kills. IMO if you want real knock protection for a modified Z32, adding a modern knock controller that works in real time is the only way your going to have protection in the areas you need it.
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