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Old 09-14-2012, 02:46 PM   #1
addictionsoLA
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Join Date: Nov 2011
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Location: Lyman, Wyoming
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2010 Wrx
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Default Pick apart my logs

AFR is rich throughout these logs, 10.0-10.3. . . does this scream boost leak to anybody else?

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

https://docs.google.com/spreadsheet/...HNTRXZiWEtCQkE
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Old 09-14-2012, 03:23 PM   #2
Tripintaz
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2013 STI Limited

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Are you on the stock intercooler? You have incrementing Fine Knock Learn at 100% throttle.

I suspect you are pushing too much boost on the stock intercooler( I saw it hit 21.5psi) The stock WRX intercooler cant cool down the intake charge very well past 18psi. Usually this can be offset by making the AFR a bit richer and limiting the timing and squeeze another 1lb out of it. But looking at your logs, the timing is already low and the AFR is rich. I'm willing to bet you're pushing too hard on the stock intercooler. Back down the boost before you break something.

P.S. I assume you have a wideband AF Guage that you are using and not the factory O2 that the AP reads as it is somewhat inaccurate at full throttle.
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Old 09-14-2012, 04:17 PM   #3
addictionsoLA
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FMS FMIC, grimmspeed EBCS, Perrin Headerback exhaust.

Reading AFR's off a AEM Uego, the factory o2 only reads to 11.

I didnt know Forge BPV had to be serviced every once in a while, I'm thinking that it got stuck partially open during tuning, and then I found out I had to service it (it was stuck in whatever position it was in), greased it and now its functioning right (correcting the leak I think it had.)

Tuning it with a boost leak and then getting the leak fixed would make the car overboost and run a bit richer yes?
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Old 09-15-2012, 03:05 AM   #4
addictionsoLA
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Not sure if this is relevant or not, but car was tuned at 4340 ft and I live at 6700 ft. Pretty sure ECU accounts for this via barometric pressure.
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Old 09-15-2012, 02:43 PM   #5
Cobb Tuning
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Quote:
Originally Posted by addictionsoLA View Post
AFR is rich throughout these logs, 10.0-10.3. . . does this scream boost leak to anybody else?

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

https://docs.google.com/spreadsheet/...HNTRXZiWEtCQkE
I would discuss this with your tuner. They are familiar with your car, the tune, and how it should respond and how it was responding when they finished your tune. If you suspect a boost leak, the best way to rule it in or out is via a pressure or smoke test of the intake tract.

Bill
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Old 09-16-2012, 12:16 PM   #6
Tripintaz
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Quote:
Originally Posted by addictionsoLA View Post
FMS FMIC, grimmspeed EBCS, Perrin Headerback exhaust.

Reading AFR's off a AEM Uego, the factory o2 only reads to 11.

I didnt know Forge BPV had to be serviced every once in a while, I'm thinking that it got stuck partially open during tuning, and then I found out I had to service it (it was stuck in whatever position it was in), greased it and now its functioning right (correcting the leak I think it had.)

Tuning it with a boost leak and then getting the leak fixed would make the car overboost and run a bit richer yes?
Yes I suppose it's possible, you need to lower the boost. 21.5 psi on the stock intercooler at 7000 feet above sea level is probably a bit too much to ask of your car. Usually the turbo dynamics would keep the overboosting in check if you had a small leak while tuning and then fixed the leak. What bought you to think it was your BPV sticking open? A hunch or some real evidence?
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Old 09-16-2012, 03:39 PM   #7
addictionsoLA
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It basically stopped functioning, I pulled it off and tried pushing on it and it wouldn't moved. I took it apart and pulled the spring and had to use a good amount of force to get the piston out. I greased it up and it moved freely again. That's what made me think it was probably open a little bit. I'm building a leak tester this weekend, I'm still kind of paranoid the intercooler pipes might have a leak, in the mean time I turned the wgdc's down until I can verify its all sealed up and get the tune adjusted.
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Old 09-21-2012, 12:48 AM   #8
bshep211
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Can someone look at my logs as well. I have knock errors and the engine will audible knock when i am a quart low on oil. My sti will eat up 1 quart of oil every 1500 to 2000 miles. There is no oil leaks and the motor runs strong. I don't see any smoke when starting cold or hot.

(I will post the logs in my thread once I can create a thread)
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Old 09-21-2012, 01:21 AM   #9
addictionsoLA
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What kind of oil do you run?
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