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Old 07-10-2006, 11:51 AM   #1
mkulak
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Default Wideband O2 in Up-Pipe?

Just got a new 3" exhaust and to my surprise it came with an up-pipe with an o2 bung in it. I don't think my currrent up-pipe has an O2 bung in it. I was wondering if I could put my wibeband O2 sensor in that O2 bung on this new up-pipe?

How much would it effect the reading been that it would be pre-turbo.
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Old 07-10-2006, 01:53 PM   #2
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I think you mean factory EGT probe bung. 02 bung goes on exhaust manifold. Wideband should be located post-turbo.
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Old 07-10-2006, 04:53 PM   #3
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well the EGT and O2 bungs are different sizes, so I mean if you can screw the wideband in go ahead.

I will warn you though, higher temps accelerate wear on the wideband sensor - you usually have it in the DP so you can attach a heatsink to it.
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Old 07-10-2006, 09:14 PM   #4
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who makes this UP with an 02 sensor bung, i'm curious

If you want to put it there, go right ahead, keep in mind we have 02 sensors closer to the block than that
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Old 07-10-2006, 10:54 PM   #5
mkulak
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I purchased the SS Autochrome 3" Turbo Back system for $275 and it came with an up-pipe with O2 and EGT bung.

I was like WOW!!!

Gonna install it once my electrical CEL fix arrives.
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Old 07-11-2006, 09:30 AM   #6
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Most wideband O2 sensors are designed to see no higher temps than about 1000*F. Putting on in the UP (doubt that is the bung you see) would kill the sensor very quickly as the temps there are normally around 1400*F. Prefereably you want the sensor after the turbo and before any cats. I would not install it right after the turbo though. I would put it a bit farther back so as to have cooler gasses running over it.
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Old 07-11-2006, 10:08 AM   #7
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DO NOT put a wideband in your uppipe. Why?

1. It will die very quickly.
2. It will NOT provide accurate readings.
3. It is NOT the place for a wideband.

The proper place is post turbo in the downpipe about 2" behind the downpipe to turbo flange. Placing it anywhere else is like kissing your sister. Yeah....it's a kiss, but it ain't worth much.
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Old 07-11-2006, 02:55 PM   #8
mkulak
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Quote:
Originally Posted by subieworx
Putting on in the UP (doubt that is the bung you see) would kill the sensor very quickly as the temps there are normally around 1400*F.
Let me assure you, it is an O2 bung. I'm quite familiar with the difference between that and the EGT bung in the same pipe. I'm not new to Turbo Cars or tuning, just wanted to get the opinion of some subaru owners. I've seen O2 sensors in all 4 runners of a Turbo manifold before so I was not too worried about the heat.

My main concern was getting a good reading.

Marc
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Old 07-11-2006, 02:56 PM   #9
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Quote:
Originally Posted by mkulak
I purchased the SS Autochrome 3" Turbo Back system for $275 and it came with an up-pipe with O2 and EGT bung.

I was like WOW!!!

.
I would say wow too, considering the UP is before the Turbo

Last edited by hondaeater69; 07-11-2006 at 03:01 PM.
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Old 07-11-2006, 03:01 PM   #10
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Quote:
Originally Posted by mkulak
Let me assure you, it is an O2 bung. I'm quite familiar with the difference between that and the EGT bung in the same pipe. I'm not new to Turbo Cars or tuning, just wanted to get the opinion of some subaru owners. I've seen O2 sensors in all 4 runners of a Turbo manifold before so I was not too worried about the heat.

My main concern was getting a good reading.

Marc

Correct, some of the most advanced fueling systems out there are closed loop systems with dedicated WB's for each cyclinder. These WB sensors are placed right outside the block since closed loop feedback and response time is very critical. Sure it will decrease sensor longevity, but i doubt it'll effect the reading that much.

Try it and find out is my suggestion. Log for a week or so in the UP position, then move farther down behind the turbo and log again, i doubt you will see much difference.
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Old 07-11-2006, 03:32 PM   #11
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Quote:
Originally Posted by hondaeater69
Correct, some of the most advanced fueling systems out there are closed loop systems with dedicated WB's for each cyclinder. These WB sensors are placed right outside the block since closed loop feedback and response time is very critical. Sure it will decrease sensor longevity, but i doubt it'll effect the reading that much.

Try it and find out is my suggestion. Log for a week or so in the UP position, then move farther down behind the turbo and log again, i doubt you will see much difference.
I like your attitude.... I am going to try it..... I've got nothing to loose.. It is a Wideband a got free due to sponsorship on an old race car. I've got a few extra sensors, and this way I won't have to do anything major to install the wideband. This is my daily driver, and I don't want to tinker tooooo much.. I've got my race car for that..

My old Eng Mgmt system would support 8 widebands for the very reason you mentioned above.

It was quite a plesant surprise getting a free up-pipe... This one looks like a quality piece with a flex section. My current one does not have a flex section and was a bitch to install when I help my friend install it a while ago. (I now own the car)
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Old 07-11-2006, 09:03 PM   #12
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my vishnu 321 up pipe (non flex) came with a wideband bung as well.
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Old 07-12-2006, 03:50 AM   #13
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posting somerwhere else

Last edited by nevergivethatup; 07-13-2006 at 09:48 AM.
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Old 07-12-2006, 12:29 PM   #14
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if you read the specs on WB o2 sensors they have an operating temperature, usually around 1200F or so. Placing them after the turbo where the gases are cooler is better as the exhaust gases are not as hot as say the header or up-pipe. I'm sure you could run them there, but they wouldn't last as long.
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Old 07-12-2006, 02:00 PM   #15
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i am currently running AEM EMS with built in wideband on my WRX.

the WRX specific instructions from AEM told me to install the sensor in place of the stock first sensor. which is in the exhaust manifold, before even the UP.

the car runs great.
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Old 05-21-2020, 03:53 PM   #16
lemonline
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Default wideband sensor

Sorry to re-open an old post, but everyone is always bitching about not reading before asking, so here is the question:

I will be running a chimney-style exhaust setup... like a 6" long pipe after the turbo... should I attach the wideband sensor there? or will it be better to run it on the uppipe?
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Old 05-24-2020, 02:08 AM   #17
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Hater pipe through the hood? Pics?
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Old 05-24-2020, 09:37 AM   #18
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Quote:
Originally Posted by NutBucket View Post
Hater pipe through the hood? Pics?
Yes Sir! hater pipe and hater external wategate pipe also. I want to sign in into an offroad race, and you canīt go normal exhaust because it could cause a fire (is a dry area).

I still have to drill the hood, Iīll post pictures when itīs done. Just want to be sure if is not thaaat bad to run the wideband sensor on the uppipe
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