Does anybody know the 2.4L LD9's factory knock sensors designed resonance frequency?

I'm not sure if the years matter although the sensors did change style, I'd be doubtful they changed the frequency since the engine design didn't change. I calculate the likely resonant frequency given cylinder bore size of 3.5" to be 3.2kHz, but that would put the highest sensitivity of the knock sensors readings to be between 3000-3400RPM or +/- 10%. This doesn't mean knock can't be heard elsewhere in the RPM band this just means this is the most accurate point of the sensors usefulness in the RPM band.

Can anybody chime in on when in the RPM band they find to always be the most sensitive and run into knock on these engines?

I'm thinking GM used a higher resonance frequency sensor with an amplification circuit and windowed the sensors polling since these engines obviously move alot faster then when resonance of detonation is most likely to occur.

If enough people could chime in on when they often run into the highest knock readings on a stock tune....and they seem to match up...that could be used to kinda nail this one down a bit.




"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous

Really? Nobody knows the windowed frequency of the LD9's knock sensor? Really?


"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous