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Old 01-09-2009, 02:16 AM   #1
CopperMach
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Wideband O2 sensor mounting location

I am curious if anyone has mounted a wideband o2 sensor in the stock svt exhaust set-up. I have an svt header/cat/flex on my car and do not see any good place to mount another o2 bung. If I can't figure this out I will probably get an orp for tuning purposes and use my cat when not tuning... Any help would be appreciated.



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Old 01-09-2009, 02:46 AM   #2
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you can disable your rear o2 sensor and put the wideband 02 sensor in place of that. That's how I ran mine.
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Old 01-09-2009, 03:49 AM   #3
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After the cat? I am pretty sure that would throw off the readings. My rear o2 sensor is disabled already, but I would like to install a wideband upstream of the cat in order to get the most accurate readings. Somebody please chime in if I am wrong about a wideband sensor's accuracy after a cat (stock svt cat in this case.)
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Old 01-09-2009, 09:00 AM   #4
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You could have an exhaust shop weld in a bung for probably $20 at the most.
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Old 01-09-2009, 11:54 AM   #5
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It must be before the cat for accurate reading.

Also the closer to exhaust ports more accurate the readings are.
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Old 01-09-2009, 01:07 PM   #6
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I know I can get a bung welded in for cheap, I am just curious about physical location on the exhaust. There just isn't a whole lot of room after the header collects down to 1 pipe and before the cat.
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Old 01-09-2009, 01:33 PM   #7
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The best place is right after all 4 meet in the collector.
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Old 01-09-2009, 06:07 PM   #8
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The rear second o2 sensor after the cat only monitors the efficiency of the converter.....the first o2 sensor is used for fuel control to let the computer know if the engine is running rich/lean. the best place to mount one is off the first o2 sensor or have one welded in like a couple other people said.
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Old 01-09-2009, 06:48 PM   #9
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After the cat the readings wil be off yes but not by much to make a huge difference.
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Old 01-09-2009, 09:30 PM   #10
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Quote:
Originally Posted by thisdude_05 View Post
After the cat the readings wil be off yes but not by much to make a huge difference.
If its off .1 its a big deal to me. I want the most accurate reading I can get. .1 could make the difference for a melted piston.

Also the delay for the A/F to be read since it takes time for the exhaust to flow that far. Its reading A/F that was at 5800rpm but by the time you see it now your at 6200 and by the time you see your lean you have a cloud of blue smoke behind you.

Do it right.
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