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Old 09-29-2012, 11:09 PM   #1
zpl2
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Member#: 264713
Join Date: Nov 2010
Location: cleveland
Vehicle:
04 wrx
psm

Default Exhaust lean or rich?

Does a full exhaust cause a car to run rich or lean or neither?
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Old 09-29-2012, 11:18 PM   #2
Black94Snake
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Join Date: Feb 2011
Chapter/Region: NESIC
Location: RI
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2007 CGM VF'd WRX
12.70 @ 108.4mph

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Theoretically it can adversely effect fueling based on changing responce time of O2 sensors... However a tune is required on 03+ WRX/STi's due to boost control and CL/OL transition issues..... NOT whether or not the car will run lean/rich.
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Old 10-03-2012, 01:00 PM   #3
zpl2
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04 wrx
psm

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This is an na 2.5 forester with borla headers and cousin catback
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Old 10-04-2012, 11:29 PM   #4
NSFW
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Chapter/Region: NWIC
Location: Near Seattle, WA
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05 Stage Free LGT
ATP 3076, 6MT, AVO FMIC

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If your car has a MAF sensor, then exhaust changes shouldn't affect the mixture.

In theory, anyway. Practice doesn't always match theory.
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Old 10-07-2012, 03:11 PM   #5
zpl2
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custom catback and it has map not maf does that mean it is effected.
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Old 10-09-2012, 04:21 AM   #6
NSFW
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Join Date: Feb 2007
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Location: Near Seattle, WA
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05 Stage Free LGT
ATP 3076, 6MT, AVO FMIC

Default

I dunno. Best way to find out would be to make some data logs and see what they say.

I don't know how accurate the stock O2 sensor is on naturally aspirated Subarus, but it might be possible to get a rough idea just from looking at the data.
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