tuning with det-can tips
May 19, 2013, 03:12 PM
#17
Evolved Member
Possibly, but they are less sensitive than a microphone (typically) and so the amplifier module would need more gain.
I guess you would have to experiment and see what result you get.
I guess you would have to experiment and see what result you get.
May 19, 2013, 04:54 PM
#18
Not all knock sensors are created equal. They have different natural resonant frequencies. Their natural resonant frequency can be found by using an adjustable sine wave generator and a fullrange speaker. Simply sweep the frequency range on the sine wave generator and record the knock sensors output voltage. It will register the highest reading at its natural resonant frequency.
Depending on the engine size and characteristics, the frequency range where detonation can be heard may vary. For this reason, they tailor the knock sensor range to be most sensitive in this area. This is usually combined with high-pass/low-pass filtering in the ECU so it blocks out frequencies that do not want to be heard.
-Jamie
Depending on the engine size and characteristics, the frequency range where detonation can be heard may vary. For this reason, they tailor the knock sensor range to be most sensitive in this area. This is usually combined with high-pass/low-pass filtering in the ECU so it blocks out frequencies that do not want to be heard.
-Jamie
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