knock sensor info.

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knock sensor info.

Postby Aaran » Thu Aug 11, 2005 9:30 pm

for those that want to know.

a knock sensor detects detonation/pinking etc in you cylinders (caused by bad timing and bad fuel ie: low ron rating)

a knock sensor works by listening to the sound in your cyliners, basicly its a sensor that works within a specific frequency range that when it detects a specific sound (ie: pinking/detonation) it sends a signal to your ecu which either retards or advances you timeing to keep the engine running safe.

for those tuning hondata with cars fitted with knock sensors will find the knock warning light will spike on a data log when vtec engages, (its the pins locking the vtec proflie into place). dont try to tune it out just ignore it - if it spikes anywhere else then worry like mad.

cheers
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Aaran
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Postby Aaran » Fri Aug 12, 2005 8:26 am

added by saxman:

as for tuning on the stock knock sensor... most people agree that the oem map sensor is far from sensitive enough to tune off of, and like the o2 sensor, to do any sort of tuning, an aftermarket unit with more resolution is necessary
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