Contour Enthusiasts Group Archives Forums General Dyno and Drag Wideband bung

I want to get a bung welded in for a wideband. Right now Im making 2 assumptions:

1. Wideband sensors use the same thread size as regular o2 sensors.

2. The bung should be before the main cat for increased accuracy (no precats- headers).

Am I correct? I also havent found any bungs that come with thread in plugs. Anyone know where to get some? Also, should I worry about the y-pipe coating after getting the bung welded on? TIA.

Chris,

The wideband needs to be a certain distance away from the exhaust chamber to keep from burning out so use that as your distance gauge of where to mount it. In my case it got placed just in front of the center resonator since I don't have hany cats to worry about and it needed to be further back due to higher exhaust gas temps on my car.

As far as getting a bung, if it didn't come with one (it should have) any exhaust or parts store should have one. Just take the sensor in with you in case it is some oddball size though I think they're mostly standardized.

Rick

Well unfortunately I still have the main cat. Am I correct in assuming that the cat will change the readings (Should show a more lean condition, since it burns up some of the fuel spit out, meaning less fuel is getting to the sensor.)?

If right before the main cat is too close, however, I guess I dont have much choice.

Im also still deciding whether I want to buy a wideband sensor, or just use the one at whatever dyno I go to. Im in the process of getting an Xcal2 so I want to be able to use the data logging to its full capability. I dont need the whole setup with the gauge (like the AEM unit) if its possible to just get the sensor to plug into the Xcal. I am trying to decide if I will be on the dyno everytime I datalog, or if I should pick up my own to do in my free time.

I have a pretty good dyno hookup (about $10 a pull), but its on a dyno dynamics unit. I wish it was dynojet b/c that seems to be a more universal standard

Right before the cat, and it should be a standard O2 bung.

Right beofre the CAT!?!? What if you really cannot do this because your 2 y pipe is the cat.

Well then get rid of that silly 2 into one cat...


Theoretically one bank should be the same as the other.

Putting the O2 bung after the cat is a waste of money. It's not really accurate enought like that to really use.

The bungs are I think 18x1.5mm thread and it's a standard. Cheapest place i've gotten a stainless bung is ebay.. got 2 for 8 bucks. Also found an exhaust place by my parents that has them cheap w/ plugs.

NGK is making a wideband now... looks like a pretty good deal. PLX I think makes one.. and there's the innovate LM-1..and a couple other. Innovate has the LC-1 now which is smaller and it's pretty darn cheap for a wideband.

And yeah you have to keep it a certain distance away.. but if you go too far away then you're slowing response time. I think my AEM said something like 30" after a turbo... but closer for a N/A car. As a note I have mine 2" after the turbo and it's still fine after almost a year.... but they will burn out faster that way.

Also make sure the sensor itself is pointing downward so moisture cannot condense in it. I think AEM recommends at least 10deg from parallel to the ground.

Hey, you don't want it to run so far back that the exhaust is too cooled down!
Must be before the main cat. I'd recommend the y-pipe where the two banks come together for the best measurement.