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Old 10-20-2013, 10:29 PM   #1
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Wideband install

I'm needing a wideband because I'm wanting to get a good tune. I already got the molding pod for the gauge just not sure about install. Because I have both my rear o'2 sensors unplugged and only running with both my front o'2's. How am I gonna run a wideband?
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Old 10-20-2013, 10:55 PM   #2
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There are lots of people running that same set up with a wide band. There is probably another way to go around if.
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Old 10-21-2013, 07:44 AM   #3
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Usually you weld an extra bung into the midpipe and plug in there.
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Old 10-21-2013, 09:04 AM   #4
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Install a new bung. I was able to get in to drill the passenger side X-pipe using a small angle drill from HF with a 3/4" step bit.

I drilled about 5" downstream of the stock front O2 sensor--forgive the weld quality, it was not the easiest place for an arthritic old man to get into with a MIG gun:

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Old 10-21-2013, 04:10 PM   #5
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Question guys, I have a catted h pipe does it matter if you install the sensor before or after the cat?
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Old 10-21-2013, 06:46 PM   #6
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Quote:
Originally Posted by Rm360 View Post
Question guys, I have a catted h pipe does it matter if you install the sensor before or after the cat?
It must be before the cat to be of any real use in on-the-road "street" tuning. In normal operation the 3-way cats used on modern cars store oxygen, especially when the AFR goes lean. This stored oxygen is used to continue conversion of nitrogen oxides to nitrogen and oxygen (2NOx → xO2 + N2) when the mix does not contain enough oxygen to carry out the conversion. The stored oxygen is depleted on hard acceleration or any other rich condition.

The cat's storing and release of oxygen will make the wideband reading less accurate; not to the point of complete uselessness, but not too far removed from that. The wideband O2 tailpipe "sniffers" commonly used on dynamometers are not as effected by this because the engine is always at WOT during a dyno run...
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New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 10-21-2013, 07:40 PM   #7
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Quote:
Originally Posted by cliffyk View Post
It must be before the cat to be of any real use in on-the-road "street" tuning. In normal operation the 3-way cats used on modern cars store oxygen, especially when the AFR goes lean. This stored oxygen is used to continue conversion of nitrogen oxides to nitrogen and oxygen (2NOx → xO2 + N2) when the mix does not contain enough oxygen to carry out the conversion. The stored oxygen is depleted on hard acceleration or any other rich condition. The cat's storing and release of oxygen will make the wideband reading less accurate,;not to the point of complete uselessness, but not too far removes from that. The wideband O2 tailpipe "sniffers" commonly used on dynamometers are not as effected by this because the engine is always at WOT during a dyno run...
Thanks Cliffy! One more question I have long tubes and the o2 is mounted right before the collector, I have about 3 inches of pipe between the header and cat would it be safe to mount the wide band sensor there? I've read in turbocharged apps the sensor should be mounted 36" downstream , do you think the heat from the header will mess with the reading of the sensor?
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Old 10-21-2013, 08:07 PM   #8
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Originally Posted by Rm360 View Post
Thanks Cliffy! One more question I have long tubes and the o2 is mounted right before the collector, I have about 3 inches of pipe between the header and cat would it be safe to mount the wide band sensor there? I've read in turbocharged apps the sensor should be mounted 36" downstream , do you think the heat from the header will mess with the reading of the sensor?
You will be OK, that 36" number is just one of those "internet wisdom" things for turbo installs...
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Old 10-21-2013, 08:31 PM   #9
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You will be OK, that 36" number is just one of those "internet wisdom" things for turbo installs...
Thanks bro!! It's appreciated!!!
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Old 10-21-2013, 11:40 PM   #10
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Lol "internet wisdom". That is being very politically correct haha.
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