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Knock intensity at 3000rpm will be much lower than at 6000rpm. The knock threshold intensity will usually be higher at higher RPMs. RPM – EssentialĮngine noise increases as RPM increases. It is nice to be able to differentiate between partial throttle knock and full throttle knock. An engine can knock at partial throttle but the intensity will be lower than at full throttle. Just because this threshold is not met at lower engine loads does not mean the engine is not knocking. By monitoring engine knock at lower engine loads it is easier to perfect part-throttle ignition timing maps.įor example, the engine knock volume threshold maybe be “10” at full throttle. It’s essential to be able to detect knock at full throttle but it’s also nice to detect engine knock at any engine load.

Some of the features are a nice-to-have, others I deem as essential. In short, I personally do not see the need to pay for an external device to listen to engine knock. I believe audible knock can be detected with the ear with a normal lap top (connected to an engine bay mounted microphone or tapped directly into the knock sensor) and free software (APO Equalizer & VLC Media Player). The feature I am not interested in is audio. Some things I want, others I don’t I don’t care about The products in the test include the Plex Knock Monitor V3, the Phormula KS-4, the MoviChip KSC2 and the TunerNerd Knock Monitor Pro Elite. It is only a comparison of their feature list.įirst I will detail the products in the test, then the important features, then a table scoring each of the products according to these features, concluding with an analysis of the scores. NOTE: This is not a test of the performance of the products. I list the features I think are important and score each product for each feature to come out with a winner. A comparison of some of the main engine knock detection systems available for the automotive aftermarket including Plex Tuning, Phormula, MoviChip & Tuner Nerd.