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Old 10-08-2008, 05:57 PM   #1
The_Stache
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Wideband a/f question

So one of the first things im going to do is get a wide band a/f guage in this sucker..

My question is where would be the optimal place for the sensor.. I am assuming as far down the headers as possible but before the cats?

I would share my list of things.. but my car is going to surprise quite a few after i get it... I am thinking outside the box.
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Old 10-08-2008, 07:10 PM   #2
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well knowing what is involved in the application would definately help....
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Old 10-08-2008, 07:22 PM   #3
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We want to hear your box-annihilating ideas before we give any recommendations.
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Old 10-09-2008, 08:45 AM   #4
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For arguments sake lets just say I am going to need a wideband a/f guage... where on a normal exhaust would you mount the wideband o2 sensor?

I have been told now that wide band o2's need to be heated or as close to the collector as possible (to heat them). I didn't know that.. SOOO on to more research..
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Old 10-09-2008, 08:46 AM   #5
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We want to hear your box-annihilating ideas before we give any recommendations.
Custom setup, will be using a pressurized charge.. that's all I will say.
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Old 10-09-2008, 11:20 AM   #6
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I have a LC-1 wide band in my 4Runner. It was mounted in the down pipe before the cat. It's elf heating as all oxygen sensors are AFAIK.

The question on the Camaro would be what pipe to put it in so that it's sniffing both banks of cylinders since it's dual exhaust. If the H pip is before the cats, that'd be a good spot. If not then IDK.
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Old 10-09-2008, 01:37 PM   #7
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generally, there is a wideband bung on one side or the other, but not both sides of an exhaust system... it is accepted that what is happening on one side is happening on the other side, since most stock, or close to stock, injection systems do not have per cylinder tuning... so if bank 1 is running rich, its likely that bank 2 is running rich, as well.

putting the wideband in a location that is before the cats is the key here... you put it behind the cats, you get a false reading... alot of exhaust setups that I've seen with a custom hole for the wideband sensor have the bung on the passenger side, but I've seen some on the driver's side as well as some on the collector before the I pipe... but that's not going to work on a car with true duals, so its really just easier to use a location close to the collector of the long tubes, if you have them, and before the cats, if you have those, too.

and most new widebands are set up to be self heating... some of the older ones needed to be heated, so proximity to the headers was a must.
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Old 10-09-2008, 04:05 PM   #8
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mount before the cat, after the y-pipe... or if you are running true duals with an x-pipe, mount it in the x-pipe.
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Old 10-09-2008, 06:16 PM   #9
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Why not just get a PLX setup and use the wideband sensor in place off the stock narrowband piece?
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Old 10-09-2008, 06:30 PM   #10
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Why not just get a PLX setup and use the wideband sensor in place off the stock narrowband piece?
from what i under stand the reading from a wideband is not compatible with stock ecu's therefore you end up throwing codes/going into limp mode.

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generally, there is a wideband bung on one side or the other, but not both sides of an exhaust system... it is accepted that what is happening on one side is happening on the other side, since most stock, or close to stock, injection systems do not have per cylinder tuning... so if bank 1 is running rich, its likely that bank 2 is running rich, as well.

putting the wideband in a location that is before the cats is the key here... you put it behind the cats, you get a false reading... alot of exhaust setups that I've seen with a custom hole for the wideband sensor have the bung on the passenger side, but I've seen some on the driver's side as well as some on the collector before the I pipe... but that's not going to work on a car with true duals, so its really just easier to use a location close to the collector of the long tubes, if you have them, and before the cats, if you have those, too.

and most new widebands are set up to be self heating... some of the older ones needed to be heated, so proximity to the headers was a must.
Thanks Silver this was exactly what i have been looking for. (Same for you camarospike) I knew I could count on you guys.
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Old 10-09-2008, 07:04 PM   #11
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thats what we're here for.


i was going to make the comment that the 4th gens got lucky with the aftermarket ORY's as most came with a bung already installed after the collector for the wideband.
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Old 10-09-2008, 07:14 PM   #12
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I know what an O2 sensor is. But whats a a/f sensor?
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Old 10-09-2008, 07:33 PM   #13
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from what i under stand the reading from a wideband is not compatible with stock ecu's therefore you end up throwing codes/going into limp mode.
Thats why you get the PLX wideband.....
http://www.plxdevices.com/AppNotes/PLXApp004.pdf
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Old 10-09-2008, 08:32 PM   #14
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I know what an O2 sensor is. But whats a a/f sensor?
there's narrow band and wide band o2 sensors, they are both a/f sensors

narrow band, like nearly all cars have are normally referred as just "o2's"
and they either read rich or lean, hence the term narrow band

a wide band o2 sensor is comonnly called a "wideband" or "air/fuel sensor" it reads more in depth and allows for more precise tuning of the air fuel ratio.

bout as simple as I can make it.
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Old 10-09-2008, 09:45 PM   #15
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Here's something I could use a "+1" on...

Based on what I was told (just today, actually)...their names are misleading -- because they don't actually measure "o2"...They are thermometers that measure exhaust temperature. That information feeds back into the computer, and it makes use of it coupled with the MAF sensor to determine if the engine is running rich or lean.
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Old 10-10-2008, 11:48 AM   #16
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Got it. Thanks CamaroSpike and Dragon.
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Old 10-10-2008, 02:55 PM   #17
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Here's something I could use a "+1" on...

Based on what I was told (just today, actually)...their names are misleading -- because they don't actually measure "o2"...They are thermometers that measure exhaust temperature. That information feeds back into the computer, and it makes use of it coupled with the MAF sensor to determine if the engine is running rich or lean.
Not on wide band. The one in my 4Runner requires calibration every 5,000 miles or so in fresh air. If you even breath near the sensor it throws it off. I have to remove it from the exhaust and hit a calibration button that measures the surrounding clean air and compares it to a table of known clean air for calibration so that the A/F ratio it reads is precise.
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Old 10-10-2008, 04:51 PM   #18
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some nice reading on o2 sensors and widebands

http://www.aa1car.com/library/o2sensor.htm

http://www.aa1car.com/library/wraf.htm
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