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02-04-2013, 07:56 PM | #1 |
Scooby Newbie
Member#: 330232
Join Date: Aug 2012
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MAIC
Location: Richmond
Vehicle:2004 no more subarus blue |
2013 wrx stage 1 Data logs
From what I know everything seems to be fine but something was troubleing me so i just want to be sure. Here are a few logs from today. No knock showing in the logs however when i was viewing live data after a long drive home i checked out the "knock sum cyl 1,2,3, and 4. Cylinder 2 showed 130 knock episodes in about a 120 mile drive. Cylinders 2 and 3 showed 5 each and 4 was 15. Now reading forums everyone says dont pay attention to this but ive only seen cylinder 4 raised because thats where the knock sensor is. So why is my Cylinder 2 knock sum going bat **** crazy?
https://docs.google.com/spreadsheet/...mc&usp=sharing https://docs.google.com/spreadsheet/...Hc&usp=sharing https://docs.google.com/spreadsheet/...2c&usp=sharing If anyone can shed some light to make me feel safe it would be much appreciated!
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02-05-2013, 08:48 AM | #2 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
If cylinder 2 is showing as the highest, that is a bit unusual. IIRC, I think that I've seen that before on a few cars (those that support per cylinder knock sum). For most cars, 4 shows the highest count with 2 the second highest. But, really, the values themselves are meaningless because they are also being incremented at idle and extremely low loads where the knock detection system doesn't work properly (which is why the ECU does not respond to these perceived knock events). As to why yours is showing 2 as higher, it may be that the knock sensor is not quite orientated right from the factory. But, I don't think that is necessarily a problem in and of itself. It may have no real-world significance when you get down to it. Would be interesting to see knock sum values from other 13' WRX owners. Bill |
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02-05-2013, 09:24 AM | #3 |
Scooby Newbie
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https://docs.google.com/spreadsheet/...UE&usp=sharing
This log was taken this morning also during a long drive. about half way through my trip i took a log. As you can see cylinder 2 and 4 are still marking lots of events. All of this is under 3000 rpm and mostly on cruise control. They do not log new events during WOT. I just dont know what to think about it because otherwise everything seems fine. |
02-05-2013, 09:30 AM | #4 |
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https://docs.google.com/spreadsheet/...FE&usp=sharing
There is another one from a few minutes before. |
02-05-2013, 09:34 AM | #5 | |
NASIOC Vendor
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Quote:
Bill |
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02-05-2013, 09:37 AM | #6 |
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Vehicle:2011 WRX Limited WR Blue Pearl |
Is it possible that there is a loose part rattling around near cyl 2? The knock sums are always higher on my #2 and #4, but 4 is always highest.
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02-05-2013, 09:44 AM | #7 | |
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02-05-2013, 09:45 AM | #8 |
Scooby Newbie
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02-05-2013, 09:48 AM | #9 | |
NASIOC Vendor
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Quote:
Bill |
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02-07-2013, 04:45 PM | #10 |
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Vehicle:2009 DGM STi E85+ 08/13 WRX,03 EVO,12 GT500 |
Mine is exactly the same. During a 20 min ride home from work the other day it logged 85 sum on cyl 2, less than 10 on the other 3. Never anything during a WOT data log. I'm not really concerned, maybe they moved the knock sensor......
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04-04-2013, 11:27 AM | #11 | |
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Location: Huntington Beach, CA
Vehicle:2013 WRX Dark Grey Metallic |
Quote:
Im just running the Cobb OTS Stage 1+SF LWG map. Everything else is stock and my car only has 2500 miles on it right now. These logs were taken on 4/3/2013 at 7:30PM-ish and it was about 62-70F out on surface streets. (these dont have a huge value of knock compared to this morning for some reason. Ill post that later today when I can find another USB cable.) Now for some reason I PEAK target boost at 25psi (log 1 in the middle somewhere?) randomly but the rest were fine. https://docs.google.com/spreadsheet/...Hc&usp=sharing https://docs.google.com/spreadsheet/...Xc&usp=sharing Here is today's Log (4/4/13 7:15am-ish 61-64F outside on the freeway) https://docs.google.com/spreadsheet/...Wc&usp=sharing Last edited by pkluong; 07-04-2013 at 01:58 AM. Reason: added log |
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04-05-2013, 09:21 AM | #12 | |
NASIOC Vendor
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Quote:
You have one WOT run in your last log and it looks good. The large boost target (25 psi or so) that you see in the log is a large 1st gear compensation we use in our maps. This pushes the target high in order to achieve better boost response in 1st gear in which you would not have any risk of overboosting, but would are likely to be well under your target normally. Bill |
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04-05-2013, 10:04 AM | #13 | |
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05-21-2015, 02:12 PM | #14 |
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Vehicle:2013 WRX ICE Silver Metallic |
I was having the same question and searching i found this threat. Mine is also a 2013 wrx and for some reason cylinder 2 is always super high against all others knock sums.
Right now I got: Cyl #1: 1 Cyl #2: 53 Cyl #3: 0 Cyl #4: 3 I have read around people having the same situation. When I check they have 2013 wrx! Last edited by alexr40; 05-21-2015 at 03:07 PM. |
05-21-2015, 02:35 PM | #15 |
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You have 3 cyl1's?! Awesome :P
Like Bill mentioned, don't worry much about knock sum unless you suspect an issue. FBKC and FLKC as well as DAM are what need to be watched. |
05-21-2015, 03:07 PM | #16 | |
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Quote:
Yes i know.. I just wanted to chime in in order to share what other 2013 wrx fellows notice regarding knock sensor and its possible relocation in 2013. Seems to catch more noise in #2 rather than #4 like previous years. This could possibly affect 2013 WRX OTS maps where there's added timing in cyl#4 because the sensor listens better in that area and pull timing faster than other cylinders. If this is true, then modifications to the maps should be made and add those extra 0.35 degrees in cyl2 instead of cyl4. |
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05-21-2015, 04:16 PM | #17 | |
Scooby Newbie
Member#: 390623
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Location: Las Vegas
Vehicle:2013 WRX WRB |
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05-27-2015, 09:51 PM | #18 |
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What would be the factor to bring attention that would need reviewing of the sum values? Some form of knock that stays there or one that appears at all?
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05-28-2015, 08:22 AM | #19 |
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Vehicle:2015 Porsche Cayman |
The only time I enable and log knock sums is if I have fine knock learn. This way I can see if the knock is actually happening or just learned from a previous pull. I would just ignore them.
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05-28-2015, 01:29 PM | #20 | |
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Quote:
It mostly increases when I am accelerating aggressively from low RPM or after shifting and taking turns too aggressively. |
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06-14-2015, 02:12 PM | #21 |
Scooby Newbie
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FWIW my car is still not blown up and I've had over 300whp for 40k miles.
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06-15-2015, 02:41 PM | #22 | |
Scooby Newbie
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Vehicle:2013 WRX WRB |
Quote:
It’s usually random, sometimes #4 is higher or they’re both equal, but usually #2 is higher. I don’t know how these sensors work, but they’re a complete mind****. No difference in drivability. |
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