Mounting o2 sensor. Where in exhaust?

[stradlater]

I have an o2 sensor to mount somewhere after the turbo. Where do I out it to make sure it's the right
temperature?

Immediately after the turbo or with some gap?

[JustCallMeOrlando]

Is it wideband/narrowband? Is it heated/unheated?

The wideband on my old car got located about 0.5-1m away from my turbos, as per TechEdge's recommendation. The factory O2 sensor on the wifes car is about 20cm from the back of the turbo.

[stradlater]

It's a wideband Bosch. Not sure about the heated thing, I think it's not.

[JustCallMeOrlando]

If it's wideband it's most definitely heated. They need to be at a very precise temp to work, hence the complexity in the controller. 0.5m to 1m is where I'd put it.

[stradlater]

Ah I'm with you entirely now... Cool thanks mate

[MWP]

My LC-1 wideband is at the bottom of the dump pipe, just under & infront of the sump.

Make sure its welded in at a horizontal angle or tip downwards in the pipe.

[stradlater]

90 degrees to the pipe you mean?

[the_random_hero]

90 degrees to the pipe you mean?

Nope, he means horizontally or angling down. Stops any condensation from building up and dripping into the sensor.

[stradlater]

Ah thanks mate!!!

[MWP]

Yup.
Otherwise condensation builds up around the base of the sensor and can rust/damage it.

[oldcorollas]

before first cat or first res/muffler is a good place.
the difference in response time between there are dump is negligible, and the lower heat will help.

http://www.bosch.com.au/content/lang.../Section_D.pdf
page 8 onwards

they say should be close as possible to the engine, respecting the maximum allowed temperature range, but..

edit: condensation can crack the ceramic sensor.....= bad

[stradlater]

I don't think this is a ceramic sensor (doesn't look like it, but I'm no expert)...

Either way, I"ll whack it someone where things won't build up..

[YLD-16L]

I don't think this is a ceramic sensor (doesn't look like it, but I'm no expert)...

Either way, I"ll whack it someone where things won't build up..

They all have a ceramic element inside that metal tip with the holes in it.

[oldcorollas]

it is the Zirconia ceramic cell which makes it an oxygen sensor.
the wideband has an additional zirconia "oxygen pump" which sits over the narrow band inside it..
like this


narrow band looks liek this



the wideband is actually just a narrow band.. but with a second zirconia cell to pump air in or out of the space between the narrow band and the exhaust...
by measuring the current required to pump oxygen, to keep the inner narrow band at stoich, it can tell what the actual oxygen content of the exhaust is.....

err.. nerdily like this \/

[stradlater]

Farkk. That sounds all a bit confusing.. I'll try decipher that another day. :-)