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Old 01-05-2013, 05:53 AM   #1
02bugeye1
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Member#: 270483
Join Date: Jan 2011
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Location: BALTIMORE MD
Vehicle:
2005 impreza wrx sti
World rally blue

Lightbulb Tuning 05 sti

As the title says I'm looking to tweak my tune a little. I have a 05 sti with gt spec uel headers and uppipe,full exhaust,aem cold air intake, walbaro 255 pump, turbo xs rfl.. Running cobb stage 2 map with my wideband installed I noticed it runs 10.0 air fuel ratio which seems to be way to rich for me.. My question is which screen would I go into to kinda lean this put using access tuner race ??
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Old 01-05-2013, 08:19 AM   #2
Cobb Tuning
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Quote:
Originally Posted by 02bugeye1 View Post
As the title says I'm looking to tweak my tune a little. I have a 05 sti with gt spec uel headers and uppipe,full exhaust,aem cold air intake, walbaro 255 pump, turbo xs rfl.. Running cobb stage 2 map with my wideband installed I noticed it runs 10.0 air fuel ratio which seems to be way to rich for me.. My question is which screen would I go into to kinda lean this put using access tuner race ??
Only the Cobb SF and stock intake are approved to work with our OTS maps for this particular car. Any other intake could potentially cause load errors which can cause issues with fueling and timing. You will want to calibrate for the intake before doing anything else. The method for doing this is explained in the tuning guide at the following link:
https://forums.cobbtuning.com/forums...and-Worksheets

I would also make sure your wideband is reading correctly. Compare it against the front o2 sensor reading ("A/F Sens 1 Ratio" on AccessPORT) in closed loop. If 10.0 is the pegged reading with the sensor/gauge, then it may not be reading accurately (although due to load errors or other mechanical issues, it could be if this is causing you to run rich). At high load and higher RPM, our tunes can target in the 10.x:1 range, but not 9.x:1. Check your A/F Learning 1 D value as well as that can cause you to go richer than the primary open loop fueling target if there is a mechanical (or intake tuning) issue in the range in closed loop where D is learned (and which is also applied in open loop). You can determine what the ECU is actually targeting by logging "Comm Fuel Map", which is the open loop fuel target. The final target (with all compensations) will be shown by the "Comm Fuel Final" logging parameter.

Bill
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Old 01-05-2013, 08:21 AM   #3
02bugeye1
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Member#: 270483
Join Date: Jan 2011
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2005 impreza wrx sti
World rally blue

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Thanks alot for the info
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