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So, how far downstream from the turbo should an O2 sensor be located? If its too close to the turbo, will the heat damage it?
I'm going to weld a muffler vertically on the right side where the tube ends. The muffler already has a bung welded on. This can put the sensor 3 or 4 ft. from the turbo. This will be about 2' from the end of the exhaust pipe. Does putting it too far downstream have negative effects as well?

What does the manufacturer of the WB say in the instructions ?

If I remember right mine said 14" down. My whole exhaust was less than 14" so I just put mine in the radius. I would like to have had mine a bit more upright but I didn't like the way it looked sticking up out of there. Really I hate the way it looks. If I were to do it again I'd make the exhaust longer and maybe go down and turn the exhaust so it comes more out the bottom/back and put the O2 further down the pipe so it was less visible.

Bad Bob wrote: ↑Sat Dec 15, 2018 9:21 pm So, how far downstream from the turbo should an O2 sensor be located? If its too close to the turbo, will the heat damage it?
I'm going to weld a muffler vertically on the right side where the tube ends. The muffler already has a bung welded on. This can put the sensor 3 or 4 ft. from the turbo. This will be about 2' from the end of the exhaust pipe. Does putting it too far downstream have negative effects as well?
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Mine is also 4 inches or less from the turbo outlet. I've been running the same sensor for 4 years in that position.
Just make sure it's in the 10:00 or 2:00 oclock position and out of the way of something snagging it or it getting bumped or banged.

I would probably put in either in that first straight section after the little radius out of the turbo or in the upper radius at a 10:00 or 2:00 facing toward the way the wires is going to run.

On my old header, my sensor was about 4” from the turbo and it died after a few years. I don’t know if excessive heat was the cause, but I moved it to about 2 1/2’ with no further issues. My wideband is a PLX. Digging through their instructions, they recommend 3’ after the turbo. Innovate recommends at least 2’. I guess everybody’s different results are due to different sensors and EGT’s. Thanks for the advice and pictures.

Mine is a PLX also. The sensor has been right there since I built the turbo with the carb.
About 30,000 plus miles on it now.
I have never burned out a sensor. My first used Innovate LM-1 died after a couple years but the O2 sensor is still good. I have two spare sensors in the drawer but this one doesn't quit.

I saw EGT's of up to 1600*F at 4 inches from the exhaust port so by the time it gets to the sensor I'm sure it's lost some heat.

Bad Bob wrote: ↑Sat Dec 15, 2018 9:21 pm So, how far downstream from the turbo should an O2 sensor be located? If its too close to the turbo, will the heat damage it?
I'm going to weld a muffler vertically on the right side where the tube ends. The muffler already has a bung welded on. This can put the sensor 3 or 4 ft. from the turbo. This will be about 2' from the end of the exhaust pipe. Does putting it too far downstream have negative effects as well?

The sensor can go just about anywhere downstream from the turbo as long as:
a). you follow manuf. recommendations and dont install the sensor too close to the hot turbo outlet
b). you have no exhaust leaks in your down pipe
c). the sensor is not too close to the exhaust pipe termination

If the sensor is too close to the turbo, the heat can shorten the lifespan of the sensor. I know there are others here who are saying their sensors are mounted close to the turbo and have lasted a while...that's great...but Im on the other side and have already had a Bosch sensor fail from being too close to the turbo. If you have placement options for your 02 bung why run the risk of overheating 02 sensors by placing it too close to the turbo?

There is indeed a specified distance from the exhaust pipe termination. If its too close to the termination, you get false readings from fresh air 'swirling around' with your exiting exhaust. Consult your manuf. recommendations as they should state the required distance for this as well. I dont think 2' from the end of the exhaust pipe should be a problem though.

Nice work, BTW! Got any more pics of your build???

Since the bung was already welded there, I left it 2' downstream of the turbo. It will be 3' from the end of the pipe.

Sounds perfect to me