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voltage output based on vibration and the amplitude of that signal is directly proportional to the vibration it experiences. Detonation produces a very dintinct acoustic signature and of specific intensity in the location that Nissan puts it into. If you put the knock sensor in any location other than where it was designed to go, the sensor will not be able to accurately detect detonation. In fact, the relocation will actually move the sensor to a location where it can barely hear detonation within the cylinder and into a spot where it is going to easily pickup valvetrain noise. I'm presuming that your knock sensor is mounted atop the back of the plenum or perhaps at the back of one of the heads? What I have seen usually happen in cars with relocated knock sensors is that the ECU thinks they are detonating even though they really arent. I've seen this in each case when using ConZult - I know what timing the engine should be running and when I See the timing dancing around several degrees lower than what it should be running, I know it is because the ECU is pulling timing because it thinks the engine is detonating. I've even seen cases where the ECU will kick off into temporary safety boost because if excessive detonation is detected, it will branch to its low octane mode.
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