Knock Sensor Output Differences
Posted: Wed Jan 30, 2019 11:04 am
After a lot of searching, I'm having trouble finding an answer...
This question relates to the GM LS/Vortec 2000-2002 GenIII 0411 controlled V-8 engines.
I understand that knock sensors are engine specific. I've read that it has a lot to do with the cylinder bore of the block (something to do with the resonant frequency of that combination). I'm guess then this is why the knock sensors for the 5.7L, 6.0L, 7.4L, and 8.1L engines all use different knock sensor part numbers. I'm also reading that the internal resistance of the knock sensor is supposed to be something close between 93K-107K ohms (can't find if that ohm value applies to all of them, yet).
What I'm not finding is the difference between the output signals from those different knock sensors, and what the PCM does with it. And more specifically, is the bin file for each engine size somehow tied to it's specific knock sensor. So hopefully my next question makes sense. Sorry, but my "EFI" vocabulary is still a work in progress...
So the question I have is if I use a 6.0L bin file in a 0411 PCM to tune a 8.1L engine (with the correct 8.1L knock sensors in the block), will the 6.0L bin file in the 0411 PCM know how to properly handle the signal from the 8.1L knock sensors? I fully understand that the fuel and spark settings will be all wrong for the 8.1L, and I hope to change those to supply the fuel and ignition needs for this different size engine. What I'm concerned with is will the original 6.0L bin be able to correctly detect knock from the 8.1L knock sensors. (sorry or the repeat)
Why do I ask? I'm having a devil of a time finding a stock, unmolested 8.1L bin file that uses a 4L80e transmission. The two 0411 PCM's I have here with 8.1L bin files, and some other 8.1L bin files I was able to find on the net all use the Allison 1000 transmission. I'm guessing it will be impossible for me to get those bins to correctly control the the 4L80e. Unless there is a work-around for that problem...
I hope what I just asked made sense.
Thanks in advance for your thoughts on this.
David
This question relates to the GM LS/Vortec 2000-2002 GenIII 0411 controlled V-8 engines.
I understand that knock sensors are engine specific. I've read that it has a lot to do with the cylinder bore of the block (something to do with the resonant frequency of that combination). I'm guess then this is why the knock sensors for the 5.7L, 6.0L, 7.4L, and 8.1L engines all use different knock sensor part numbers. I'm also reading that the internal resistance of the knock sensor is supposed to be something close between 93K-107K ohms (can't find if that ohm value applies to all of them, yet).
What I'm not finding is the difference between the output signals from those different knock sensors, and what the PCM does with it. And more specifically, is the bin file for each engine size somehow tied to it's specific knock sensor. So hopefully my next question makes sense. Sorry, but my "EFI" vocabulary is still a work in progress...
So the question I have is if I use a 6.0L bin file in a 0411 PCM to tune a 8.1L engine (with the correct 8.1L knock sensors in the block), will the 6.0L bin file in the 0411 PCM know how to properly handle the signal from the 8.1L knock sensors? I fully understand that the fuel and spark settings will be all wrong for the 8.1L, and I hope to change those to supply the fuel and ignition needs for this different size engine. What I'm concerned with is will the original 6.0L bin be able to correctly detect knock from the 8.1L knock sensors. (sorry or the repeat)
Why do I ask? I'm having a devil of a time finding a stock, unmolested 8.1L bin file that uses a 4L80e transmission. The two 0411 PCM's I have here with 8.1L bin files, and some other 8.1L bin files I was able to find on the net all use the Allison 1000 transmission. I'm guessing it will be impossible for me to get those bins to correctly control the the 4L80e. Unless there is a work-around for that problem...
I hope what I just asked made sense.
Thanks in advance for your thoughts on this.
David