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Old 09-21-2012, 01:50 AM   #1
bshep211
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Member#: 332839
Join Date: Sep 2012
Default Knock & lower DAM in logs

I bought this car a year ago. Its a 05 sti with full exhaust, pop charger intake, BOV & cold air ram from fog light housing. I have audible knock when I am a quart low on oil. The car uses 1 quart every 1500 miles. The motors passed a cylinder compression & leakage test a year ago. The car runs strong. No oil leaks or smells. No smoke on startup. I have had -4 learning knock with dam loss when pushing it hard. I logged a few 3rd gear runs. Here are the logs. Please tell me what you think.


Thank you

bshep

https://docs.google.com/spreadsheet/...0anpIMUE#gid=0

https://docs.google.com/spreadsheet/...RazdSdFE#gid=0
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Old 09-21-2012, 02:46 AM   #2
addictionsoLA
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Join Date: Nov 2011
Chapter/Region: RMIC
Location: Lyman, Wyoming
Vehicle:
2010 Wrx
Grayish!

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Need to make the logs public.
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Old 09-21-2012, 09:09 AM   #3
bshep211
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Originally Posted by addictionsoLA View Post
Need to make the logs public.
Sorry about that. The logs should be public now.
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Old 09-21-2012, 09:26 AM   #4
Cobb Tuning
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Location: Austin, DFW, Portland, SOCAL
Default

Quote:
Originally Posted by bshep211 View Post
I bought this car a year ago. Its a 05 sti with full exhaust, pop charger intake, BOV & cold air ram from fog light housing. I have audible knock when I am a quart low on oil. The car uses 1 quart every 1500 miles. The motors passed a cylinder compression & leakage test a year ago. The car runs strong. No oil leaks or smells. No smoke on startup. I have had -4 learning knock with dam loss when pushing it hard. I logged a few 3rd gear runs. Here are the logs. Please tell me what you think.


Thank you

bshep

https://docs.google.com/spreadsheet/...0anpIMUE#gid=0

https://docs.google.com/spreadsheet/...RazdSdFE#gid=0
Are you using a custom tuned map or our off-the-shelf map? If our OTS map, which map are you running?

Bill
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Old 09-21-2012, 02:30 PM   #5
bshep211
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Default

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Originally Posted by Cobb Tuning View Post
Are you using a custom tuned map or our off-the-shelf map? If our OTS map, which map are you running?

Bill
I am using stage 2 91 OTS map.
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Old 09-21-2012, 02:58 PM   #6
addictionsoLA
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Join Date: Nov 2011
Chapter/Region: RMIC
Location: Lyman, Wyoming
Vehicle:
2010 Wrx
Grayish!

Default

That map isn't made for an intake, and the BOV isn't helping your cause either.
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Old 09-22-2012, 08:18 AM   #7
Cobb Tuning
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Originally Posted by bshep211 View Post
I am using stage 2 91 OTS map.
Your dynamic advance multiplier (DAM) has dropped very low, indicating that the ECU has perceived a number of knock events. Only the stock or Cobb SF intake is compatible with these maps and because using the wrong intake can potentially cause fueling and ign. timing errors (and knock), the first thing to do would be to switch to one of the supported intakes. I would also reflash our most conservative map, which is the 91ACN. If you have any other mechanical issues, you should fix those now. If you have any un-diagnosed issues (such as a past check engine light), you would want to get those addressed now.

I would then drive around through a tank of gas (drive normally with no heavy throttle pulls at this point) and we can look at your long-term fuel trims (A/F Learning 1 A,B,C,D). If those look OK (within around +/- 5%), then we can generally rule out additional fueling issue. At that point, you can get some WOT pulls and we can see what it looks like.

Bill
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Old 09-22-2012, 12:11 PM   #8
bshep211
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Member#: 332839
Join Date: Sep 2012
Default

Quote:
Originally Posted by Cobb Tuning View Post
Your dynamic advance multiplier (DAM) has dropped very low, indicating that the ECU has perceived a number of knock events. Only the stock or Cobb SF intake is compatible with these maps and because using the wrong intake can potentially cause fueling and ign. timing errors (and knock), the first thing to do would be to switch to one of the supported intakes. I would also reflash our most conservative map, which is the 91ACN. If you have any other mechanical issues, you should fix those now. If you have any un-diagnosed issues (such as a past check engine light), you would want to get those addressed now.

I would then drive around through a tank of gas (drive normally with no heavy throttle pulls at this point) and we can look at your long-term fuel trims (A/F Learning 1 A,B,C,D). If those look OK (within around +/- 5%), then we can generally rule out additional fueling issue. At that point, you can get some WOT pulls and we can see what it looks like.



Bill

Thanks for the support and great product. I will post more results once I have gone through a tank of gas.
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