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Old 06-14-2011, 09:41 PM   #1
nighthawk06si
Scooby Newbie
 
Member#: 267490
Join Date: Dec 2010
Chapter/Region: SCIC
Location: Orange County, CA
Vehicle:
2011 WRX Hatch S2+SF

Default Lean AFR Stage 1 OTS map??

I got a Cobb AP(2011 WRX) and had the Stage 1 ACN91 map reflashed and I was doing some data logging and it seems my AFR is in the 11's under load. Was hoping someone from Cobb could take a look and see what's going on...

https://spreadsheets.google.com/spre...thkey=CO_3psAJ

https://spreadsheets.google.com/spre...thkey=CIbyutwG

If you guys need me to log with any of the other tables, let me know cause your feedback would be greatly appreciated.

edit: I know the side bar says I have SF and I'm on a stage 1 ACN91 is because I haven't installed the SF intake yet so just take that into account. I know there is a SF map i need to reflash when the SF intake is installed..
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Last edited by nighthawk06si; 06-14-2011 at 09:53 PM.
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Old 06-15-2011, 10:49 AM   #2
Cobb Tuning
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Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL
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Hello.

Unfortunately, monitoring the factory A/F sensor is not an accurate means of determining AFR under boost. AFR will be limited to no richer than ~11:1 AFR regardless of the actual AFR. A wideband o2 sensor (with our AccessTUNER software) is what would be needed to accurately determine AFR.

That said, for a basic stage 1/2 car, you can monitor A/F Learning #1 A, B, C, D to determine if there are any potential fueling issues. These are your long-term fuel trims and should be generally within around +/- 5%. Although these are determined in closed loop (basically idle and cruise conditions), the "D" range is also applied in open loop (basically acceleration above cruise) and fueling issues in closed loop could potentially be used to assume issues that would impact open loop as well. That is, you don't need a wideband o2 for a basic stage 1/2 set-up to determine potential issues with fueling.

Bill
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Old 06-15-2011, 06:26 PM   #3
nighthawk06si
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Member#: 267490
Join Date: Dec 2010
Chapter/Region: SCIC
Location: Orange County, CA
Vehicle:
2011 WRX Hatch S2+SF

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Quote:
Originally Posted by Cobb Tuning View Post
Hello.

Unfortunately, monitoring the factory A/F sensor is not an accurate means of determining AFR under boost. AFR will be limited to no richer than ~11:1 AFR regardless of the actual AFR. A wideband o2 sensor (with our AccessTUNER software) is what would be needed to accurately determine AFR.

That said, for a basic stage 1/2 car, you can monitor A/F Learning #1 A, B, C, D to determine if there are any potential fueling issues. These are your long-term fuel trims and should be generally within around +/- 5%. Although these are determined in closed loop (basically idle and cruise conditions), the "D" range is also applied in open loop (basically acceleration above cruise) and fueling issues in closed loop could potentially be used to assume issues that would impact open loop as well. That is, you don't need a wideband o2 for a basic stage 1/2 set-up to determine potential issues with fueling.

Bill
Thanks for clearing that up Bill. I'll take a look at the A/F Learning and keep an eye out for those and get a couple of logs with those on the datalog.

Thanks!
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