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Old 08-14-2012, 12:20 PM   #1
Joshmath
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Join Date: Aug 2012
Chapter/Region: AKIC
Location: Fairbanks
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2010 Scoobie WRX
OBP

Default Having some knock readings, need advice.

Hello everyone, I am tuned on a COBB 91 octane shelf map, but can only use 90 octane because I live in Alaska and that is all we have. I decided it would be interesting to log in a morning run with the engine warmed up on my way to work. What I found was a little bit of feedback knock that I have never had in my countless other tests, does this look scary or should I not worry about it? Getting it tuned other than a third party tune is not an option for me as i am 300+ miles away from a tuner. No dyno in Alaska.

https://docs.google.com/a/alaska.edu...4Ny00OXc#gid=0

Lemme know what you guys think, thanks!
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Old 08-14-2012, 01:17 PM   #2
SouthernWRX
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Location: Cypress, TX
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2012 WRX Base
Ice Silver

Default

No expert, however what I have learned through reading and research is that you had one knock event (row 36, -1.4) and the others (row 37 - 45, -1.4 thru -.35) are the ECU learning back to 0. I would try to get a couple more logs in 3rd from 2K - 6K (redlineish) and see what happens. It may just be a bad tank of gas. Mine was doing the same thing around the middle of a WOT run in 3rd. Since then I have been through a tank or so of gas and it has gone away. Hope this helps and I'm sure Bill (cobb tuning) will be around sooner than later with his advice.
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Old 08-14-2012, 01:36 PM   #3
Joshmath
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OBP

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thanks southern, appreciate the post, do you mean bad gas as in bad octane or just bad gas?
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Old 08-14-2012, 02:58 PM   #4
SouthernWRX
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I'd just think bad gas. If you wanted you could always add a bottle of octane booster. They usually all say "108 Octane", however they actually only take you up about 3 points. Honestly I would just continue to do some live logging while driving and watch it. What year is the car and how long have you been running the map?
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Old 08-14-2012, 03:44 PM   #5
Joshmath
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OBP

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it's a 2010 subaru WRX and I have been running the car for the whole summer so about 3 months since I have bought it on that tune. Noticed a lot of very small -1.4 correction knocks but never on the feedback knock side so that was interesting to see. I bought the car and it was stage 2 tuned and the owner had it to that tune. I may be over boosting a bit though, getting up to 18 psi when my tune says I should only get up to 16.8 and trickle down to 14 by redline.
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Old 08-14-2012, 03:47 PM   #6
bacalhau16
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In your case, bad gas and bad octane is one in the same. 90octane just sucks. Perhaps an e-tune would be best for you. Torque Performance is what i used. Perhaps call them, explain your situation and go from there. Its usually about $80 from them. Gained reliability and perhaps even performance.
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Old 08-14-2012, 04:57 PM   #7
Joshmath
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thanks bacal I'm going to look straight into that!
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