Thread: Location of Wideband O2 sensor?

So yeah, I'd like to know where I should mount it. I was planning on using a test pipe, with the bung welded in.

My setup will consist of a N/A one at first, but switch to boost later. I know it should be mounted far from the turbo, but will it also work when used with N/A?

If you go on the Innovate website they have information on where the ideal placement would be. Try
them, you should be able to get good info off of there.

18" from Head NA

36" from Turbo (Or if you are in high RPM's a lot, or running race fuel a lot)

http://www.schnitzracing.com/manuals/AEMWBK.pdf

18" from the exhaust ports of the head if N/A according to the AEM PDF.

36" from the exhaust ports of the head if turbo according to the AEM PDF.


Innovate recommends about 12" - 18" from the outlet of the turbo, but I guess AEM's advice is best just in case you're doing some retarded rear mounted turbo.

If you can get it 6" from the outlet of the turbo you're in real good shape IMO. You have to balance two factors. Temperature and responsiveness, both related to distance. Getting the sensor up to temp quickly and keeping the sensor hot is important. Too hot and the sensor can fail quickly though. Too cold and it will never be accurate. Header wrap, heat shields, pre-cats, and stainless steel material all play into it.
Also you have to balance how close it is because too far away from the engine will give hugely delayed data.

Wideband sensors are heated internally so they'll never be 'too cold'.

Yes they are heated internally. Yes they can still be too cold. They can live further from the head than an unheated sensor, but they still need a good amount of external heat. The heater is to get them up to temp faster, but not enough to keep them at operating temp far down the exhaust stream.

So sticking a wideband up the muffler at the end of the exhaust would always result in 'too cold' ? The heater is there to ensure a minimum temperature is maintained which the sensor can operate at. Dyno widebands have to work the same way, they're heated and always up the end of the exhaust which if anywhere, is going to be the 'coldest' place.

What kind of temperature are you considering too cold? do you have a link to some manufacturer data showing the temp range the sensor must be in to be accurate?

mine is hooked up on my ssac in the o2 bung thats just past the flex tube..

sounds like thats to far away? would it be better to put it where the stock o2 sensor goes? then i could just tell zetronix to use it as a narrow band also..

No, it has to read all 4 cylinders, I have mine just before the flex, I welded a bung in there on the SSAutochrom header...

Hmm interesting, when I was turbo I had it like 8" away from the turbo

Sounds like I need to put the bung right behind the oil pan on my downpipe. That should be around 12-18" from the turbo.