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Old 08-07-2012, 05:33 PM   #1
bluemax189
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Default a WTF datalog

Just did a data log this afternoon, no changes have been made to the car at all. Also use the same shell gas station for every fill up.

Today:

https://docs.google.com/spreadsheet/...lFrcTBMUFdOUXc

From 5/24:

https://docs.google.com/spreadsheet/...WYtSlFXZlY1Z0E

Any help would be appreciated. Definately switching to the 91 map as a safety precaution but very very curious why when nothing changed on the car im getting so knock events.
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Old 08-07-2012, 09:32 PM   #2
hutch959
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your af learning has changed also.
was the 5/24 a fresh reflash? or did it have time to learn.
any intake updates?
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Old 08-07-2012, 10:42 PM   #3
bluemax189
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Was a fresh reflash on 5/24 maybe 20-25 miles before the log. Amd intake has stayed the same cobb sf and box
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Old 08-08-2012, 09:51 AM   #4
Cobb Tuning
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Quote:
Originally Posted by bluemax189 View Post
Just did a data log this afternoon, no changes have been made to the car at all. Also use the same shell gas station for every fill up.

Today:

https://docs.google.com/spreadsheet/...lFrcTBMUFdOUXc

From 5/24:

https://docs.google.com/spreadsheet/...WYtSlFXZlY1Z0E

Any help would be appreciated. Definately switching to the 91 map as a safety precaution but very very curious why when nothing changed on the car im getting so knock events.
The long strings of -1.4 fine knock learning looks like it would be bad, but it is just a single event that is being re-applied to a larger load/RPM range. You see a lot of values in the log simply becuase you are hovering in that load and RPM cell for a while and it is just applying that single correction over and over. It is at very low load and not a concern. The second -1.4 correction is also at fairly low load and not an issue.

The other corrections at WOT did not get learned in this log but are based on some past event. Hard to tell what the cause was - so it makes it tricky to determine if it was based on, say, lift-throttle events (which would be noise) or is actual knock in the middle of a WOT run. You can add the knock sum parameters to your log which will show you when the fine knock learning is actually being learned. Don't get caught up in the knock sum values themselves (they are meaningless and it is normal for some cylinders to be higher than others), but look at when the knock sum increments (changes from 9 to 10, for example). Get a few more WOT logs with the knock sum and see if you can catch when the fine knock learning is being learned.

As hutch959 pointed out, you do have some borderline fuel trims in this log. I would keep an eye on those and see if they get worse. It may indicate you have a fueling issue, such as caused by an intake tract leak or other issue. Are you at stage 1 or stage 2? Your load is a tad high - could indicate a boost leak (although it really could be that high if you are at stage 2 - impossible to be sure).

Bill
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Old 08-08-2012, 09:19 PM   #5
bluemax189
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thanks for the reply. i did switch maps to the 91oct to be safe. would the long strings eventually go away after time or would an ecu reset be needed? also im still using the stock plastic bpv so im sure that might be an area of concern for a boost leak.
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Old 08-09-2012, 08:46 AM   #6
Cobb Tuning
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Originally Posted by bluemax189 View Post
thanks for the reply. i did switch maps to the 91oct to be safe. would the long strings eventually go away after time or would an ecu reset be needed? also im still using the stock plastic bpv so im sure that might be an area of concern for a boost leak.
They will eventually go away when no additional perceived knock events are found. You are only seeing a long string because you were at low load and maintaining steady RPM at the time which put you in that particular learned cell for an extended period (so it was just re-applying the correction over and over).

Bill
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Old 08-12-2012, 08:20 PM   #7
bluemax189
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will a reset help bill? hoping for a protune soon but cant decide to keep the power setup the way it is, or add a few things first.
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Old 08-14-2012, 05:56 PM   #8
Cobb Tuning
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An ECU reset would clear out any stored Fine Knock Learning, but it will also reset your DAM back to a default value. The ECU will essentially be starting from a blank slate and begin learning, compensating, and optimizing. You are welcome to try it if you would like. Like Bill said though, if no knock is present those values will decay themselves away without an ECU reset.

Either way, keep an eye on your Fine Knock Learning and Feedback Knock Correction to see if the problem persists.

Chris
COBB Tuning
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Old 08-15-2012, 07:35 AM   #9
bluemax189
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thanks everyone for the info.
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Old 12-09-2012, 08:52 AM   #10
bluemax189
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https://docs.google.com/spreadsheet/...FRktmdHc#gid=0

new forge bpv and af learning is fixed. Was hoping it was just a loose clamp but apparently the stock bpv was the culprit. anyways, glad its fixed.
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