So, either you would need to determine the natural frequency of your engine (I'm not sure how to do this other than strapping an accelerometer on it and tappping it with a hammer, but I'm sure there are more exact ways), or by finding a GM car that is a 4cyl with as small a bore as possible, as I've read that bores affect the frequency knock sensor that should be usedĪs you can tell, I'm not much of an EE, but if someone on your team is sharp with electronics, they could back-engineer from the GM module what kind of filtration is done. The olny problem with this is that different knock sensors have different natural frequencies just as different engines will have different natural frequencies when they knock. GM for a long time in the mid 80's through early 90's made external knock sensor modules that took the raw signal from the knock sensor, filtered and conditioned it, then set the ECU what basically amounted to a digital signal for Knock/No Knock. They are contantly putting out a nasty waveform, but the spikes become much larger when knock occurs.
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