Wideband AFR sensor location
 

Guys,

What's the consensus for locating the sensor's boss on the exhaust system?

On PET, the 964 turbo has the Lamda sensor located somewhere on the exhaust pipe the 'wastegate' is mounted. I've seen a couple of guys here position the sensor on the top of the turbo-muffler coupling (but it's particularly hot here and I've seen some relocate to the muffler's bottom pipe).

Which is reckoned to be best? (Does one need a heat shield to stop the sensor baking in the turbocharged-exhaust-pipe sun?)

tj,

The general opnion will pobably tell you 6-10 inches from the turbo outlet at the 2 or10 o'clock position and preferably with a heatsink and shield.
Also your configuration will depend on your exhaust system , zork or
muffler and tail pipe.

Cole

+1 as Cole stated.

For my application, there was too short a space between the muffler and turbo outlet to get far enough away from the turbo and not cook the sensor. So, I installed mine in the tailpipe as close to the muffler as possible....probably 10 inches away from the tip. Works fine, the only risk being that at a standstill and stiff tail wind, you may get some ambient air getting in and causing a false high reading. But I haven't seen that happen.

This where Innovate tech support told me to mount mine.

http://forums.pelicanparts.com/uploa...1258152464.jpg

I get good stable readings and I also have a 2000 deg. heat shield on it.

Thanks, guys - so, close enough to the action (but WITHOUT getting melted)? ;)

Gsmith, my car's muffler is pretty similar to yours - I see that you've located the sensor nearer to the cold side of the turbocharger, but it's still going to be pretty, damn hot there! (I can see why a heat shield would be a really good idea.)

David and Mark - thanks and I hope you're both returning to full strength and peak physical condition very soon. ("Tiptronic?" splutter... cough.. Get well, Cole, and then help kick his behind for even suggesting such a thing! ;))

tj,

Innovate also makes a great heat sink for mounting to the bung. The EGTs on
a 930 are really brutal and sensors burn up fast without adequate precautions. I
ran my LM-1 hard wired in the car but only use it to power my digital dash display. When tuning or periodic AFR and system checking I reinstall the WB02 and run some data and then remove it. If your not doing track work that's the way to go.

Cole

They also suggested the 1 inch bung I'll see if I have a pic with the heat wrap. I found one.
http://forums.pelicanparts.com/uploa...1258154679.jpg

Yup, I've already burned up two sensors running them next to the turbo. One of my projects this winter is to get a bung welded on the pipe beyond the muffler. I have a RarlyL8 muffler so there is room on the right hand side where it will get more airflow and be away from the turbo completely.

^^^ +1. I've burned up several as well at the track. Happens a lot when I blast of out of the pits. It just goes into some error mode and it's no good after that. That's with a zork.

For the street, I need to move it to the outlet portion of the muffler like above and use my heatsheild.

I installed a catalytic converter bypass pipe for "test purposes only". I have already done the air injection delete so I don't need this threaded fitting. With some delicate drilling and tapping, I was able to get a WB02 sensor threaded inside the male M22x1.5mm fitting (so now it is a hermaphrodite fitting?) midway between the turbo outlet and the muffler. Here is a picture of the fitting on the bypass pipe:
http://forums.pelicanparts.com/uploa...1258169347.jpg

Mark

tj,

Thanks for the kind words and the "OLD ONE" is just great.

Cole

What if you're running a zork?

use a heat sink

g,

Great idea with the heat sock, Nice install.

Cole

thanks time will tell if I did good

Sensor placement reply
 

I attached my sensor at the end of the muffler and it is connected to a XD-16 gauge on the dash. This works well and was straightforward to connect.


http://forums.pelicanparts.com/uploa...1258266555.jpg
http://forums.pelicanparts.com/uploa...1258266597.jpg

When I bought my NGK wide band setup they recomend installing the 02 sensor 10 times the dia. of the exhaust system from the end (ie. 3' pipe = 30"), to insure false readings from air being sucked back in the end.

I'm thinking I will mount a temp sensor on the heat shield and run it then move it inside and see how hot it gets if it warm enough I might do this soon.

That's a very innovative approach - I hadn't considered that! :cool:

Thanks, I have an LM-2 and can connect it to this and can log AFR's, boost and rpms.