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Originally Posted by inopsey
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I agree with the 2nd part of your post (that I didnt quote) but the product linked is junk. I havent personally used that one but knock lights are nothing new. It used the factory knock sensor which is not a high quality listening device (ist freaken junk actually) and I disable knock sensors on my tunes (due to them being junk) and I unplug them and unbolt them (piss on them) and then throw them away. (because they are junk)
Now, with all that being said, some cars do have better knock sensors than others and these knock lights could have some potential with a higher quality sensor installed on the engine. You wouldnt want to try to bring that new sensor into the ecu, but just have it as a standalone knock monitoring system. My ears personally are very sensitive to knock and I like wearing ear plugs in order to hear it better. It is odd how wind and road noise as well as exhaust get muffled when the detonation can make it right past ear plugs. Another trick is squeezing my nose and blowing out (but not letting air excape) to the point my ears pop. Knock seems louder to me then too. Now this isnt scientific, and I dont consider my ears to be calibrated high quality listening devices but they do seem to be more consistent than anything else I have used. Some peoples ears might be junk though lol