I took my downpipe to get an o2 bung welded on. The guy I took it to apparently had 18 years of experience with mitsubishi's and told me that I won't get an accurate reading unless I put it 8 to 10 inches from the turbo. I've read around plenty and I have always seen at least 24 inches away from the turbo. In my instructions it says at least 36 inches away from the turbo. I don't know if that guy was full of **** or what. Thanks for the input guys.

8 to 10" is preatty close... i put mine right by the end of the downpipe and it has to go anywhere from the middle up...

Take your business elsewhere this guy knows nothing.

its not about the accuracy, its more about burning it out if too close to the turbo. eight inch from turbo is way too close, it will shorten the life. accuracy wont be a big issue long as there is no CAT in the way

My anecdotal evidence, Ive ran a bosch sensor in my DSM's stock o2 location for about 5 years now and its still running great. At least it matches my narrowband at idle (running stoich of course) which is now in the downpipe about 5 inches farther down.

at that point you will burn up sensors as was said. the accuracy between putting it that close to the turbo vs. putting it at the end of the dp or even in the test pipe ( where i have mine so i can pull the dp without the removal or o2 sensors) is so minute your average wideband will not even pick it up. ive seen no change running one in the down pipe and one on a "sniffer" in the tail pipe at the same time, both read the same

Just have it welded at the back of the dp.

+1 That close will kill the sensor.

You guys are all wrong. I ran a wideband less than 8" away from the turbine and it was still going strong after 20,000 miles with leaded gas and blown turbo's spewing oil all over. closed loop oscillations were much smaller too.



http://www.elementtuning.com/technic...alibration.htm

Every WB or EM manufacturer will tell you something different so no they are not all wrong. What you posted is the suggestion of that company

Pasted from another WB manufacturer's users manual:

"The AFR sensor should be located between 12” and 48” from the engine, upstream of any catalyst device if so equipped. The closer the sensor is to the engine, the more likely it will be overheated, possibly shortening its life. The further it is from the engine, the more likely condensed water will get into the sensor and thermally shock it, again possibly shortening its life. The sensor should be mounted at least ten exhaust diameters upstream of the exhaust exit (ex. for a 3” exhaust pipe, that is 30”). If the sensor is mounted between one and ten exhaust diameters from the exhaust exit, the AFR measured will be leaner than the actual AFR by as much as 2 AFR at low engine speeds (i.e. less than 3000 rpm)."

Mines been at about 12" or so for over 70k and still reads perfectly

I put mine at the bottom of the downpipe at the 3 o'clock position. works great