HP Tuners deciphering knock feedback (non-LS)
HP Tuners deciphering knock feedback (non-LS) @AwesomeAuto @Forcefed86 @SLOW SEDAN
I could use some help trying to understand what the heck Im looking at in this log. This is for a VR30DDTT twin turbo V6 from Nissan. I had to run an enhanced data stream just to be able to log this "knock feedback" PID. But it just sits there and oscillates just like an O2 sensor, doesn't matter if its idle/cruise/WOT. You can see I've tried to setup a histogram to look at the average, but it's still pretty useless. Any ideas on how to filter/decode this signal to be able to monitor for real knock? Stock tune and sample log attached.
I could use some help trying to understand what the heck Im looking at in this log. This is for a VR30DDTT twin turbo V6 from Nissan. I had to run an enhanced data stream just to be able to log this "knock feedback" PID. But it just sits there and oscillates just like an O2 sensor, doesn't matter if its idle/cruise/WOT. You can see I've tried to setup a histogram to look at the average, but it's still pretty useless. Any ideas on how to filter/decode this signal to be able to monitor for real knock? Stock tune and sample log attached.
It wouldn't let me open the tune but I see what you are talking about in the log, that is odd. I believe knock feedback is short term knock, related to knock offset and knock learn (long term) for how much it pulls total but not sure what else Infiniti does with them. I assume you can tweak the knock settings, for instance reduce the overall timing it can pull. Perhaps log burst knock and other knock settings as well to compare.
It wouldn't let me open the tune but I see what you are talking about in the log, that is odd. I believe knock feedback is short term knock, related to knock offset and knock learn (long term) for how much it pulls total but not sure what else Infiniti does with them. I assume you can tweak the knock settings, for instance reduce the overall timing it can pull. Perhaps log burst knock and other knock settings as well to compare.
That's what I've been wondering too but I can't seem to get the math to work that way in all instances. I thought taking the average knock feedback value +/- the low or high detonation spark table would give me something but it doesn't appear to be so cut and dry. This platform is so stinking complicated. I've submitted a ticket to HPT but so far the response is that they're not tuners they just produce the data...I think they're producing it wrong.
Have you tried monitoring it with the sensors unplugged to see what it does? Have you tried inducing "knock" with a hammer or similar near the sensor by tapping the block lightly and watching the signal to see how it reacts?
Has the motor/trans or mounting been changed in anyway that could send a false vibration/knock signal of any sort? Generally they are programmed to read the "normal" amount of noise detected by the sensor. So if anything has been changed, that they are pretty much useless without the ability to reconfigure "normal" noise.
I'll try to pull up the logs when I get home, but I am not familiar with that platform at all.
Good luck!
Has the motor/trans or mounting been changed in anyway that could send a false vibration/knock signal of any sort? Generally they are programmed to read the "normal" amount of noise detected by the sensor. So if anything has been changed, that they are pretty much useless without the ability to reconfigure "normal" noise.
I'll try to pull up the logs when I get home, but I am not familiar with that platform at all.
Good luck!
Have you tried monitoring it with the sensors unplugged to see what it does? Have you tried inducing "knock" with a hammer or similar near the sensor by tapping the block lightly and watching the signal to see how it reacts?
Has the motor/trans or mounting been changed in anyway that could send a false vibration/knock signal of any sort? Generally they are programmed to read the "normal" amount of noise detected by the sensor. So if anything has been changed, that they are pretty much useless without the ability to reconfigure "normal" noise.
I'll try to pull up the logs when I get home, but I am not familiar with that platform at all.
Good luck!
Has the motor/trans or mounting been changed in anyway that could send a false vibration/knock signal of any sort? Generally they are programmed to read the "normal" amount of noise detected by the sensor. So if anything has been changed, that they are pretty much useless without the ability to reconfigure "normal" noise.
I'll try to pull up the logs when I get home, but I am not familiar with that platform at all.
Good luck!
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