MartinS Posted February 4 Report Share Posted February 4 Hi, I have some confusion about filter choice for knock tuning my Subaru EZ36. I used the formula for Knock Resonant Frequency=1800/3.14*piston diameter(mm) So with an engine bore of 92mm (very close to piston diameter) I get a Knock Resonant frequency of 6.23 kHz. Should I go straight to that setting of 6 kHz or is it better to start with a wider freq band for setup and go to 6 kHz when all the levels are set? Quote Link to comment Share on other sites More sharing options...
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