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05-12-2012, 09:03 PM | #1 |
Scooby Specialist
Member#: 258628
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: PA
Vehicle:2009 WRX stg2-SOLD 2012 MS3 |
2009 WRX Stage 2 + SF (light knock?)
Greetings Nasioc,
I think I'm getting some knock at higher rpm with my new setup, I would greatly appreciate if COBB could comment on these logs. Thank you. 2009 WRX Stage 2 + SF map 93 Octaone, version 3.0, normal wastegate. Running the MadDad shorty + COBB SF intake. 75F temperature. 93 Octane. Thanks! https://docs.google.com/spreadsheet/...VNvelNpRURJTmc https://docs.google.com/spreadsheet/...0ctQ3BXbzlvZnc https://docs.google.com/spreadsheet/...Ec2bTdLZGlmd0E
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Last edited by moonrider_99; 05-12-2012 at 09:09 PM. |
05-13-2012, 08:15 AM | #2 | |
NASIOC Vendor
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Join Date: Mar 2001
Location: Austin, TX
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Quote:
Some high load fine knock learning can be due to abruptly lifting off the throttle at the end of a WOT run. This is then re-applied over and over (well after the event) until the ECU learns the correction back to zero. Usually, though, that is a single count (i.e. -1.4 in this case). You can reflash our most conservative map (ACN91) until you get the pressure test done. Bill |
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05-13-2012, 09:57 AM | #3 | |
Scooby Specialist
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Join Date: Sep 2010
Chapter/Region:
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Location: PA
Vehicle:2009 WRX stg2-SOLD 2012 MS3 |
Quote:
I have a few questions. Regarding the possible boost leak and A/F learning 1 correction, this means my car is going lean (unmetered air after MAF, before Turbo) and the ECU is adding fuel to compensate-correct? How is A/F learning 1 calculated? Since the final A/F ratio is in the 11s, is it safe to say that for the time being, the car is running "fine"...? I have a log from 2/08/2012 when I was STAGE 1 + SF (stock dp), my A/F Learning 1 values were the same. https://docs.google.com/spreadsheet/...1E4VGZ0R2lkSnc Interestingly, same STAGE 1 + SF setup but logged on 6/15/2011. Does this mean I could have an air leak in my COBB intake? https://spreadsheets.google.com/spre...IzYkE&hl=en_US I'm going to get the car tested for leaks in the next 7-10 days, provided I drive conservatively for now, how urgent is getting this resolved? Is the knocking related to the possible boost leak or are these two separate things? Should I consider getting a Pro-tune? Thank you Last edited by moonrider_99; 05-13-2012 at 11:08 AM. |
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05-13-2012, 11:13 AM | #4 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
You can still hit peak boost with a boost leak because the ECU can compensate for the loss of boost and ramp up wastegate duty. A boost leak can cause problems depending on its severity because the turbo ends up producing more boost than you are actually seeing in the logs (possibly putting it outside its efficiency range). That means hotter intake air and greater chance of detonation. Again, that may not be the case here, but when you have any suspicion about it, it would be a good idea to get a pressure test done. Especially before you get your tune. There isn't a problem with driving it until then - just keep an eye on the fuel trims. If they start to get even worse, that may be a clue that a fueling issue is more of a possibility. Bill |
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05-13-2012, 11:46 AM | #5 | |
Scooby Specialist
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Join Date: Sep 2010
Chapter/Region:
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Vehicle:2009 WRX stg2-SOLD 2012 MS3 |
Quote:
My fuel trims are "-", I'm sorry I thought it was "+" for some reason and was adding fuel. Since it's negative, ECU is removing fuel because a portion of the metered air may be escaping, suggesting (in theory) a post turbo leak- i got it now. I will have the car checked, I'm just curious what happened between June of last year and February of 2012. The A/F correction went from -2.34 to -6.25 and that was without any mechanical changes. Then, with the addition of a shorty DP, it stayed at -6.25. Last edited by moonrider_99; 05-13-2012 at 11:51 AM. |
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05-13-2012, 07:12 PM | #6 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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06-16-2012, 08:07 AM | #7 |
Scooby Specialist
Member#: 258628
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: PA
Vehicle:2009 WRX stg2-SOLD 2012 MS3 |
Cobb,
I think your boost leak diagnosis was correct, what was a minor leak became more significant. Yesterday my car developed a loud boost leak. I'm going to take a guess and first change my OEM BPV myself and see if that helps. Is the car is safe to drive (off boost of course), based on this short log? It looks like I have a major leak after the turbo as A/F Learning 1 (%) values are "-". And I don't hit full boost (should be 18.5-19 PSI) but my A/F is ok and I see no knock. https://docs.google.com/spreadsheet/...WhSSUNFQ3RlQmc Thanks |
06-16-2012, 08:06 PM | #8 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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06-17-2012, 06:35 PM | #9 |
Scooby Specialist
Member#: 258628
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: PA
Vehicle:2009 WRX stg2-SOLD 2012 MS3 |
Thank you, BPV on order and appointment for next weekend with a local Subaru shop just in case. I'll report the outcome for historical purposes.
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10-06-2012, 11:29 PM | #10 |
Scooby Specialist
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Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: PA
Vehicle:2009 WRX stg2-SOLD 2012 MS3 |
Bump for COBB.
Bill was 100% correct regarding the air leak and resulting ECU correction that he noticed in my logs. The car was smoke tested and I had a leak on the left side of the intercooler where it is connected to the turbo, so I was loosing metered air under boost. Thank you for pointing this out and I'm very impressed with the accurate diagnosis by Bill/COBB just by looking at my logs. Last edited by moonrider_99; 10-07-2012 at 10:48 AM. |
10-07-2012, 09:41 AM | #11 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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