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Old 10-26-2010, 07:09 PM   #1
followmylead
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aspen

Default wideband question

so which side of the turbo would be the better side for my wideband? or is it going to make a difference? i have a bung on both sides and would like to know if anyone has an answer.

thanks
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Old 10-26-2010, 07:26 PM   #2
JTPerryR1
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After the turbo is better. Like 8" if possible
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Old 10-26-2010, 11:28 PM   #3
sense of nature
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I have mine approx 4" off, in the downpipe, never had a problem AFR's r tight !
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Old 10-27-2010, 06:22 AM   #4
followmylead
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in my 240 my wideband is after the turbo but the manifold runner length is much shorter than the subi. i appreciate your .02
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Old 10-27-2010, 07:13 PM   #5
followmylead
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anyone else?
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Old 10-27-2010, 07:18 PM   #6
Fastenzeit
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My AEM ugeo says bungs should be welded at a 10 degrees incline from horizontal position of the pipe to keep moisture contact away. I think its around 36" from the headers or 16" post turbo(around/before the curve of the dp and way before the cat)
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Old 10-28-2010, 12:27 AM   #7
JesseL
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My wideband o2 sensor was aprox 3" from the turbo outlet, after burning up 2 o2 sensors in 3 months, I had another bung welded in near the oem 2nd, and I haven't had any troubles in the last few months on one sensor.

I should add that the wideband is an innovate, and when the sensors died they flashed the error code of "sensor to hot"
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Old 10-28-2010, 12:33 AM   #8
NSFW
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Post-turbo for sure. The pressure in the up-pipe will throw off the readings otherwise.

I very much doubt that the people who advised putting the sensor 16" downstream of the turbo were thinking of Subaru's super-long pre-turbo exhaust plumbing when they came up with that guideline. Most downpipes that have bungs, have the bungs just a couple/few inches from the turbo.

For every person who blew through sensors like the previous poster, there's plenty running long-lived sensors right behind the turbo. Mine's been in place for about a year now and it's still working fine.
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Old 10-28-2010, 01:36 AM   #9
hot-j
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36 inches is standard practice for any turbo application.
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