Wideband Sensor Placement Suggestions

[STHPERFORMANCE]

Ok tomarrow i am welding a o2 bung into my Buschur Racing Downpipe for my AEM Uego Wideband..

I was thinking about putting the bung about 4" inchs below the flange where the Downpipe meets the o2 housing.

My question is, Is that a good place to mount the o2 sensor for wideband??
Or should i mount it further back around the end of the DP where it connects to the test pipe...


Suggestions please...

Thanks

 

[blue1]

Mount your sensor approx 18" away from turbo flange and approx 2 o'clock position, Reasons: wide band sensors dont like to see heat above 850c temps and if you mount them higher than the centreline of the pipe they dont accumulate condensation, hope this helps.

 

[Staytuned]

Put it between your flex section and your cat up on an angle away from the drive shaft.

 

[moonstation2000]

i just got my wb (plx). anyone replaced the stock o2 with the wideband in the stock loc?
is it too hot there for the wb 02 sensor?

 

[karbon]

is it too hot there for the wb 02 sensor?

Oh god, yes. A few posts up it was just stated to put it 18" after the turbo flange because the exhaust gas is too hot any sooner. The stock location is a matter of a few scant inches from the turbo flange.

 

[ikickuintheball]

I have my PLX wideband in the front o2 location since August, and it's still fine.. I don't see any problem with it. Why don't people put the EGT in the o2 housing? Because it won't read 1600* when it's 1600*. I'm willing to bet that the front o2 doesn't see over 1600* even when you see 1600*F on the EGT that's just inches from the head.

 

[defrag010]

Why don't people mount EGT's in their exhaust tip?

Because the exhaust gets cooler the more distance it gets from the head. It defeats the purpouse of an EGT if you are going to install it in the downpipe.

 

[moonstation2000]

I think the plx instructions said to pick an installation spot that doesn't exceed 850 degrees

 

[moonstation2000]

i don't think the previous post recommended installing an egt in the o2 housing. just stating (i think) that temps at the o2 sensor in the o2 housing are cooler than those measured at an egt in the typical location.

 

[moonstation2000]

Don't mean to hijack but where can i get an o2 bung?

 

[Staytuned]

Slowboy

 

[poorboyj]

I have my PLX wideband in the front o2 location since August, and it's still fine.. I don't see any problem with it.

I have a 1g, with my WBO2 sensor in the stock O2 sensor position as well, since July. No problems as of yet, it was a 45 minute install. BTW, I am runnign a Zeitronix so a new sensor is $30 from a VW dealer.

Jay

 

[Staytuned]

This is directly from the AEM manual.

"Mount the O2 sensor in the exhaust system at least 18 inches downstream from the exhaust port. If you anticipate high EGT's (over 800C), run a turbocharger, run at high RPM for extended periods of time or plan on running leaded race fuel then you must mount the sensor at least 36 inches or more downstream of the exhaust port as all of these can cause the sensor to overheat."

Exhaust temp limit= 1030C



Just because you do something and it works for awhile does not mean that it's right. If you want to have a sensor that's not accurate and that you have to replace more frequently then mount it in your O2 housing.

 

[OMN_DSM]

Don't mean to hijack but where can i get an o2 bung?

Just pick up a 18mX1.5 nut and weld it in. I gaurantee its cheaper than Slowboy.

 

[espinelli]

I have an AEM WB UEGO as well and decided to leave my front 02 sensor in stock operation. I've basically eliminated the second factory 02 sensor which is normally used to check the efficiency of the CAT. Obviously if you go this route there is no need to weld in a bung either.

That location seems to be providing an accurate reading and has worked very well for me. If you prefer to leave both 02 sensors in, I would install it where your CAT would normally be located. If by chance you are running a CAT, make sure you install it PRE CAT and NOT after the CAT otherwise it will alter your WB reading.

 

[espinelli]

Why don't people mount EGT's in their exhaust tip?

Because the exhaust gets cooler the more distance it gets from the head. It defeats the purpouse of an EGT if you are going to install it in the downpipe.

The EGT theory does not apply here. Provided you do not have an exhaust leak before the WB sensor you should have an accurate reading. Mounting the sensor 1/2 way down the DP or in the 2nd factory O2 sensor location has worked fine for me.

 

[kiggly]

Wow, its obvious nobody posting here has measured before and after-turbo temps.

Mount it in the stock O2 position if you want, it will be fine. When in boost, temps fall somewhere in the range of 300F through the turbine wheel. Heat energy is a major part of what the turbo harnesses (read: enthalpy). You would have to exceed about 1850F before the turbo to get past 850C after it. If its that hot, you have more important things to worry about than O2 sensor life.

Kevin

 

[espinelli]

Kiggly, the way I've interpreted AEM's documentation was if you met one of the following conditions:

High egt's, run a turbocharger, high rpms or run race fuel. Then AEM recommends you mount the sensor 36" or more from the exhaust port.

 

[beat90tsi]

This is directly from the AEM manual.

"Mount the O2 sensor in the exhaust system at least 18 inches downstream from the exhaust port. If you anticipate high EGT's (over 800C)...

Exhaust temp limit= 1030C

Do you know how farking hot 1030C is?
1886F to be exact.

 

[Staytuned]

Yep and thats the limit for the Bosch sensor as far as temps go.

 

[beat90tsi]

Well I think the engine is the bigger concern at that point, I don't even want to think about how hot the EGTs would have to be to make the O2 that hot. But the stock O2 location seems like a bad idea, because....then where do you put the ECU's O2 sensor?

 

[92tealTSI]

there are so many threads about this. Put it where the instructions w\ your wideband say to put it, which would be 18inches downstream and at the 2 o clock position.