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Old 10-22-2019, 05:37 PM   #1
Serge415
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Default Feedback knock, FKL, DAM for 2014 Subaru WRX

Hey guys,

Kind of a newb question, but I'm only slightly familiar with what these things mean and would love some insight. After a spirited drive Feedback Knock read -5.8/0 (usually at 0.00/0.00 any other day), FKL read -2.49/.33 (usually -1.09/0.33 on any other day), and DAM stays consistently at 0.938... what does this all mean?

checked oil level after... might be down a quart.

---
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Old 10-23-2019, 05:45 AM   #2
aqtruong
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2011 WRX Sedan
DGM

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Probably not the answer you're looking for but it'd be best to contact your tuner
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Old 10-23-2019, 08:05 AM   #3
awfulwaffle
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Means your car's pulling timing in response to knock. Could be real knock, could be picking up something rattling around in the engine bay. Does the feedback knock occur under load/in boost?
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Old 10-23-2019, 08:38 AM   #4
horsePOOGAS
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WRB

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Did you just fill up with fuel? These cars are sensitive to octane changes. I recently had an experience where I was down to a quarter tank or less and filled up. Experienced some -6.0 FBK and I suspect it was because there was 87 octane in the fuel hose before the 93 was able to start flowing. I'm tuned for 93.

Just something to think about. It completely cleared up for me as soon as I drove it for a bit and got the tank down.

As someone else already mentioned, if you have a tune I would send a log to your tuner and let them have a look.
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Old 10-24-2019, 06:03 PM   #5
Serge415
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Quote:
Originally Posted by awfulwaffle View Post
Means your car's pulling timing in response to knock. Could be real knock, could be picking up something rattling around in the engine bay. Does the feedback knock occur under load/in boost?
It does not occur in boost, that's the weird thing
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Old 10-24-2019, 06:05 PM   #6
Serge415
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Quote:
Originally Posted by horsePOOGAS View Post
Did you just fill up with fuel? These cars are sensitive to octane changes. I recently had an experience where I was down to a quarter tank or less and filled up. Experienced some -6.0 FBK and I suspect it was because there was 87 octane in the fuel hose before the 93 was able to start flowing. I'm tuned for 93.

Just something to think about. It completely cleared up for me as soon as I drove it for a bit and got the tank down.

As someone else already mentioned, if you have a tune I would send a log to your tuner and let them have a look.
Now that you mention it, it was a sketchy gas station in the woods... i fill up 91 always, but yes I've heard that could happen with bad quality gas, and I'm hoping that's it, and is only temporary seeing as my normal readings aren't as significant.
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Old 10-25-2019, 07:44 AM   #7
horsePOOGAS
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Quote:
Originally Posted by Serge415 View Post
Now that you mention it, it was a sketchy gas station in the woods... i fill up 91 always, but yes I've heard that could happen with bad quality gas, and I'm hoping that's it, and is only temporary seeing as my normal readings aren't as significant.
Then I would just drive the car easy for a bit. I bet that's what has happened. Just don't flog on it lol
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