wideband O2 mounting position?

[dooda]

Hi all

quick question , i just bought a innovate mtx-l wideband kit.
What is the best position to mount the sensor ? obviously the standard narrowband is on the left bank of extractors , is it okay to stick with this position? or is it better to have it after the merge pipe so its reading both banks?

thanks all

[Holden202T]

i've generally put them after the collector on my installs

[dooda]

Sweet thanks mate I presumed it would be better behind the collector so it was measuring both banks of exhaust flow but just wanted to check

Cheers mate

[Six_Shooter]

It won't really matter.

Placing the WBO2 sensor after a merge will measure an average of all cylinders, but depending on where the merge is this can cause a long delay in reading the changing AFR. Keep this in mind when you're adjusting VE tables.

Placing the WBO2 sensor to read one bank, will usually read very close what all cylinders will, since they should all be somewhat close on burn in a well running engine.

The thing you want to make sure of is that the WBO2 sensor is placed in the top third of the pipe, vertical being ideal, and not too close to the engine that it overheats.

[dooda]

thanks for the response mate

If i place it after the merge pipe for both banks , like you were saying about the delayed readings. Do you think this will make a huge effect on my tuning the ve tables etc ? or will the delay be minimal ? I suspect the delay will be fairly minimal

Thanks

[antus]

I would say it would be fairly minimal. Lots of people take the readings from the end of the exhaust without problems and it would be quicker to react than that.

[dooda]

sweet
ill run with mounting it at the merge pipe then

Thanks for the input all

[Helical]

I have been meaning to ask the same question, so I'll hijack for a second if I may...

I took a photo of my exhaust when I did the last service. I'm thinking of installing the wideband O2 sensor where the red arrow is, the narrowband is on the other bank on the header for the rear pair of cylinders. Anyone see any issues with this placement?

Also, how do you drill the hole and weld the bung in without ending up with swarf in the cats? I am thinking grease on the drill bit for the hole and don't blow holes welding.

Troy

[Six_Shooter]

There will be enough of a delay that when you're tuning, especially during transitions, you will need to keep in mind at what cell and RPM you were in before the reading you're tuning for.

I.E. You're revving through the RPM range and you see a point at 70 KPA and 2200 RPM, that seems lean, you will, depending on the delay, need to loo at the cell at 60 KPA and 2000 RPM, or even lower sometimes to adjust for the proper cell that is the issue.

GM thought this was enough of a problem that many cals actually have O2 lag qualifiers that is used for O2 correction.