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Old 08-25-2016, 01:11 AM   #61
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Looking more at the data and knock per cylinder it looks like I need to turn the gain on 3 down a decent amount and gain 2 down some too



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Old 08-25-2016, 04:02 AM   #62
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I am about to configure my knock window and your post was very helpful. Catted!
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Old 08-25-2016, 01:27 PM   #63
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Is there a reason you aren't looking at knock above 80kpa and abover 4000rpm?
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Old 08-25-2016, 02:08 PM   #64
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Quote:
Originally Posted by aidandj View Post
Is there a reason you aren't looking at knock above 80kpa and abover 4000rpm?
nope, no reason. Those were the default settings. The first batch of runs I was mostly trying to determine the appropriate knock gain per cylinder and knock threshold vs RPM.
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Old 08-26-2016, 12:06 AM   #65
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So this is probably obvious to most of you guys...
But for those who are lost on cylinder gain tuning, here is one way to do it:

1. Set all knock cylinder gains to 1.000
2. Data log a couple of WOT pulls using the entire RPM range. I did a couple of 0-60 on the street.
3. Plot the 4 knock channels using excel or any spreadsheet program
5. Create a math channel with each knock cylinder channel and multiply it by a constant gain and plot the results. The goal is to have the 4 cylinder stack on top of each other as much as possible (assuming the log did not have any knock)
- in my example cylinders 1 and 4 were lower than 2 and 3. This is due to the location of the knock sensor being closer to these cylinders. I tried a couple different multipliers and graphed them in excel until they stacked as much as possible (compare left vs right graphs).
6. update the gains in tunerstudio and burn the new tune.
7. datalog a couple more pulls and view the data to verify that they stack as best possible.



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