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Old 05-20-2010, 10:46 PM   #1
dr3w
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Default EJ20G/K Stock O2 Sensor Location

Bought my car with a tubular manifold so i never got to see the stock manifold o2 sensor location.

It's currently in one of the manifolds runners what i was wondering is if it should be in the downpipe right after the turbo which make's more sense to me ?
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Old 05-20-2010, 10:53 PM   #2
Jaxx
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g is in the right hand headder the k is in the dp neck
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Old 05-20-2010, 11:02 PM   #3
69subaru360
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I have an aftermarket downpipe on my EJ20G that has a bung in it. I put the O2 sensor there in the DP. It just seems like a more logical place for it. I know it's just a narrowband sensor, but O2 sensors are more accurate when not subjected to pre turbo exhaust pressure. It's also less likely to get damaged by road debris in the DP, unlikely I know, but it happens. Mine runs fine with it moved to the DP, no issues.
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Old 05-21-2010, 10:35 AM   #4
suberdave
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i too moved my O2 from the manifold to the downpipe. works just fine...

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Old 05-21-2010, 11:13 AM   #5
Cbgrandtheftauto
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I run PFC so I didnt need a 02 sensor but I did install the wb-02 in the bung right in the mouth of the dp
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Old 05-21-2010, 12:14 PM   #6
Eatoniashoprat
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I thought the reason they had it in the manifold is because its a lot closer to where the action is, and since its only used for idle/cruise feedback a) there isn't as pressure at these operating points when the sensor is actually used and b)it can respond a lot faster to needed changes.

Although everything is happening fast enough I can't see having it in the downpipe being an issue.
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