Wideband O2 Sensor Placement
05-13-2011, 06:18 PM
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Wideband O2 Sensor Placement OK, I've read a couple posts on here related to placement of the wideband O2 sensor in the exhaust stream but haven't found any really definitive answers. I'm running Kooks LT's and true duals with an H-Pipe. Common sense would seem to dictate placing the sensor right in the middle of the H-Pipe to read what would seem to be a running average for both cylinder banks. Anyone running a wideband AFR with a long tube/H-Pipe setup?
05-16-2011, 06:59 AM
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I would be afraid to put it in the H crossover. The air that travels through there is just to balance out the system. For all we really know, it could be full of fuel vapors, or extremely lean in there since air is not required to go through the crossover. I would just pick a side of the true duals and mount the wideband.
Last edited by BlueThunder2; 05-16-2011 at 09:55 AM.
05-16-2011, 12:54 PM
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Best place to put it is on the driver's side IMO. That side typically runs a little leaner than the passenger side on all the vehicles I've touched.
Ideally, if you were to tune off of reading the plugs, I'd go based on the last cylinder on the driver's side. I think that would be the one to "pop" if things were too aggressive.
Ideally, if you were to tune off of reading the plugs, I'd go based on the last cylinder on the driver's side. I think that would be the one to "pop" if things were too aggressive.
05-16-2011, 05:20 PM
#5
We have just completed dyno tuning my C5 & I have a couple of thoughts regarding this.
I have a NGK WB located in the middle of the X passenger side, plumbed into HPT. Also a WB for the dyno was located at the output of the tail pipe drivers side, I have cats.
The WB bung was factory installed, shadowed by the NB O2 sensor....I see a problem with that.
Our AFR was close enough that we could see power going up or down a few HP by the dyno & the dyno WB showing very small changes around 13.0. The NGK in the X mid pipe indicated a much richer AFR, on average .6 lower.
I'm still digesting the results of all of this, so if you have questions that may help me sort it through.
I have a NGK WB located in the middle of the X passenger side, plumbed into HPT. Also a WB for the dyno was located at the output of the tail pipe drivers side, I have cats.
The WB bung was factory installed, shadowed by the NB O2 sensor....I see a problem with that.
Our AFR was close enough that we could see power going up or down a few HP by the dyno & the dyno WB showing very small changes around 13.0. The NGK in the X mid pipe indicated a much richer AFR, on average .6 lower.
I'm still digesting the results of all of this, so if you have questions that may help me sort it through.
05-16-2011, 08:22 PM
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A couple of things. One is the calibration of the sensors. If they are not calibrated before every tuning session, their data can be off a bit.
The other being your sensor was installed on a merge and a lot closer to the headers or manifolds.
The sensor in the X-pipe would be more accurate as to what the motor is really doing. The one in the tailpipe is measuring air that has been filtered out a little bit through mufflers, piping, etc. Also, the air has had time to burn the fuel a little bit more in that amount of distance. Lastly that sensor could be picking up some fresh air since it is so close to the tailpipe.
The other being your sensor was installed on a merge and a lot closer to the headers or manifolds.
The sensor in the X-pipe would be more accurate as to what the motor is really doing. The one in the tailpipe is measuring air that has been filtered out a little bit through mufflers, piping, etc. Also, the air has had time to burn the fuel a little bit more in that amount of distance. Lastly that sensor could be picking up some fresh air since it is so close to the tailpipe.
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05-17-2011, 08:11 PM
#8
driver side header or driverside y-pipe after ther 1st o2 sensor, but make sure its in front of the cat if you have cats.... when you weld the bung in put it on a little angle up due to moisture build up in exhaust system from vehicle sitting over night, could short out sensor and give faulty readings..
