It is a good idea. YOu need to find a good reliable knock signal or risk injecting too much water due to other engine noises at high RPM.
The holy grail is finding a true "knock signal", a "voice print" of your particular engine is necessary, may be require a high speed DSP (digital signal processing) chip to record and compare and filter out the background noise.
Good luck with your prioject.
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Richard L
aquamist technical support
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