A post from Kurt on the AEM forum (reposted here [ Ссылка ]) pointed out that if anyone wants to get the most from their knock feedback circuit on the AEM EMS they should do some audio analysis with a flat-response sensor.

I purchased a cheap flat-response knock sensor and some single core microphone cable and hooked it up to my engine. I recorded a drive and lined it up to the high-speed ECU log. What I found was that the 3000GT basemap is not set optimally for this new knock sensor and/or my engine.

The default basemap has "Knock Center Freq" set to 6.64kHz. This MAY be accurate for the stock knock sensor but for this new flat-response knock sensor that value is too high and will effectively miss some instances of knock.

You can see in this video that the knock signal is strongest below 6640Hz. I agree with Kurt, if you have an EMS and you want to maximize the knock sensor's effectiveness doing this is a MUST.

Best viewed in 1080p mode so you can see the plus symbols that mark where 6.64kHz is in relation to the pink and green areas of the knock signal.

свернуть