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04-21-2012, 04:23 PM | #1 |
Scooby Newbie
Member#: 281343
Join Date: Apr 2011
Chapter/Region:
MAIC
Location: Knoxville, TN
Vehicle:2014 STI Limited Plasma Blue Pearl |
Strange Fine Knock
My friend is datalogging and consistently gets feedback knock between 4k and 5k rpms. The fine knock isnt being learned away; it gets worse and then just stops.
I think he has some sort of rattle in the car that is affected by the vibration that exists inbetween 4k and 5k rpms. I only think this becuase from what I have seen, feeback knock is learned away. In this case, it gets worse and just stops. I have also heard that your heatshield or something else could rattle and cause this. His car is a 2011 WRX with Stage 1 OTS NWG map, 93 octane. All help is appreciated. Thank you. https://docs.google.com/spreadsheet/...mZMbFU2dk5Kc0E https://docs.google.com/spreadsheet/...WdZZFAteWhCMEE https://docs.google.com/spreadsheet/...1hPdXYxZm5ub2c https://docs.google.com/spreadsheet/...nU0Wjd2anh6Rnc https://docs.google.com/spreadsheet/...EtYYzlXUjI1LWc
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04-21-2012, 09:16 PM | #2 |
Scooby Newbie
Member#: 267463
Join Date: Dec 2010
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thats learned knock... and it looks like it is starting to decrease.
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04-22-2012, 10:30 AM | #3 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Best thing to do in this case would be to reflash the most conservative map (91 ACN) and then do some driving for about a week. If it occurs again, then it is likely just noise. Bill |
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04-22-2012, 12:15 PM | #4 |
Scooby Specialist
Member#: 275888
Join Date: Mar 2011
Chapter/Region:
MAIC
Location: Frederick MD
Vehicle:2011 WRX Limited SWP |
Did your friend fool around with launch control around that RPM range? That'll do it too.
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04-22-2012, 12:21 PM | #5 | |
Scooby Newbie
Member#: 281343
Join Date: Apr 2011
Chapter/Region:
MAIC
Location: Knoxville, TN
Vehicle:2014 STI Limited Plasma Blue Pearl |
Quote:
We flashed it to the 91 map after Bill's post and he will drive it for a week or two and then we will datalog it again. He is a very mild driver like I am, so the 91 will be no big deal. I will post the follow-up logs next weekend or the weekend after. If anyone else has any experience on this type of event, please share. Thanks guys for the help. |
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04-23-2012, 09:07 AM | #6 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
So, when you see fine knock learning in your logs, it may not be current perceived knock, but the re-application of a past correction. Values outside of the 1.4 deg. decrements are values that have started to learn back to zero. You could even pass through multiple cells consecutively in the log that have some correction that is being applied. Bill |
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04-23-2012, 08:27 PM | #7 |
Scooby Newbie
Member#: 281343
Join Date: Apr 2011
Chapter/Region:
MAIC
Location: Knoxville, TN
Vehicle:2014 STI Limited Plasma Blue Pearl |
Bill-
Thank you for the fantastic responses; says a lot for COBB customer support. Now that we better understand that it is learned fine knock, the dots are starting to connect. When we made our first attempt at datalogging, my buddy did a 1st to 6k, then a 2nd to 6k and let off. Right after he shifted into second, the car bucked a bit in the 4k to 5k range...he isnt much of a shifter. It just felt like the clutch was grabbing or something, he wasnt smooth with it at all. During this first run (the 1st to 2nd gear), I didnt know that I had to press the button again to datalog; I know, I'm a newb at this. We figured this out when we plugged in the AP. After doing some reading we found out that you have to press the button again. We went right back out after these failed datalogs to to record the ones I posted up in this thread. Would it be possible that his awful shifting could have caused this learned fine knock? It was probably 10 minutes and less than 3 or 4 miles after his shift-fail that we took these 5 datalogs. Thank you for all your help so far, it is much appreciated. |
04-24-2012, 08:35 AM | #8 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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04-27-2012, 05:34 PM | #9 | |
Scooby Newbie
Member#: 281343
Join Date: Apr 2011
Chapter/Region:
MAIC
Location: Knoxville, TN
Vehicle:2014 STI Limited Plasma Blue Pearl |
Quote:
We did some datalogging today with the OTS Stage 1 91 map. As you will see, there is not any fine knock. We both think it was that horrible shifting that got the learned knock to show up on the old datalogs. Would it be safe for him to go back to the 93 map and datalog it after another week of driving? Thank you for your help. https://docs.google.com/spreadsheet/...F9qX25Dc0ZCdnc https://docs.google.com/spreadsheet/...nZiZk1GUUFCd1E https://docs.google.com/spreadsheet/...k1UNlN2b3VVU3c |
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04-28-2012, 07:57 AM | #10 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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06-26-2012, 08:40 PM | #11 |
Scooby Newbie
Member#: 281343
Join Date: Apr 2011
Chapter/Region:
MAIC
Location: Knoxville, TN
Vehicle:2014 STI Limited Plasma Blue Pearl |
Well, my buddy has been on the 93 Normal Wastegate Stage 1 tune since my last post in this thread (2 months ago). We did some datalogging today to see what was going on.
https://docs.google.com/spreadsheet/...TdFbENQY3gtSWc We think it looks normal, but we are no experts on the matter. There could be a major brain-fart hiding in that log. Hopefully not. Thank you for all of your help. |
06-27-2012, 09:10 AM | #12 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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