Air Fuel ratio bung location.

[Praetorious]

Hey guys, hope everyone is doing well,i wanted to ask a question and a favor if possible, on my 89 i am going to install a new midpipe here soon and trying to think proactively,ive toyed with the idea for several years of installing a air fuel ratio on my car but this may be something i might never do however since im installing this pipe and i work in a shop with access to a welder and a welding machine why not install a bung while its off the car nice and accessible and not later when its buried in there?

I want to know where is the best place to do this,i know and ive heard several things "put it down here and to the side and below this and behind that" lol, i am more of a visual person,does anyone have a picture or maybe a pipe they could circle where this would could be more easily understood,it would help other people too i assume,a million thanks if anyone can do this, the only thing i know for certain is that it has or should be on the drivers side,also any ole bung will do or should i get a specific model or anything you guys recommend?

I apologize if this is already on here somewhere, i tried to look but i couldn't find anything,thank you much.

 

[gkomo]

+1

I need a bung welded in for my wideband (supercharged) and I ‘know’ where it needs to go but a picture would also be helpful.

Supposed to go 15” down from the collector (or header flange) and at an angle where it doesn’t sit facing upwards as to not get water/condensation staying on it. However, my OEM O2 sensor is like right there and there’s not much other room with my upstream catalytic converter.

 

[AeroCoupe]

I have always heard you install them between the 9:00 and 3:00 which keeps any liquid from getting in the sensor. Went to Innovate's website and this was in the installation instructions for one of their wide bands. Its on pages 8 & 9.

https://www.innovatemotorsports.com/wp/content/uploads/2022/05/LM2_Manual.pdf

 

[Praetorious]

Thank you for those instructions, ill definitely save those,gkomo, im guessing you still have your original H pipe? reason i ask is because most aftermarkets dont have a upstream cat like the OEM one had,just one set towards the bottom,yeah that would kinda complicate things in the room department but im sure a lot of people have done it.

 

[gkomo]

Thank you for those instructions, I’ll definitely save those,gkomo, im guessing you still have your original H pipe? reason i ask is because most aftermarkets dont have a upstream cat like the OEM one had,just one set towards the bottom,yeah that would kinda complicate things in the room department but im sure a lot of people have done it.

Close, I have the way too insanely expensive CARB legal Magnaflow xpipe.

 

[Praetorious]

Wow that is expensive,i was not familiar with that pipe but i looked it up, by the time my quest for that perfect sound ends ill have probably that much into it,lol,to be honest in the last 30 years i have probably spent on my 2 Mustangs the price of a small house in need of repairs and they dont look any better than your average old 87 to 93 out there but i guess we spend money on things we enjoy.

I realized after i posted my comment and saw where you live that i guess that was more of a expense you had no choice in because the requirements in Cali for cars unlike most of us, sorry.

 

[AeroCoupe]

There are no meow meows on either of my cars so plenty of real estate to put wide bands.

 

[KRUISR]

I have shorty headers and aftermarket 2.5" pipes for the remainder of the system. I have cats installed but welded in bungs for wideband sensors (both pipes) right in the area of where the mid-pipe coming down from the header would turn to go horizontal (before the cats). I don't remember off the top of my head if they are still technically on the downpipe or just into the horizontal section. My O2 sensors are within a couple inches of the header flange.

 

[Praetorious]

Meow meows, ha ha ha,KRUISER, thank you for that info,here is a picture i found of some H pipe for sale on Google, coincidentally it was from this forum,this was in 2012 and the guy selling it hasn't been on here in 11 years, i'm sure he wont mind but if its against the rules please delete,i realize there is no cats on this pipe but its a good visual reference,maybe someone that has had this installed can put a dot or circle on it so there can be a visual reference, thank you.

 

[KRUISR]

About there. Cats start about 4-8" downstream.

 

[Noobz347]

Install the bung within 1 to 3 inches of your narrow band sensors but [not] inline. Clock it at a different location (between 9 and 3) while not [in-line] of your OEM sensors.


So, anywhere around these areas where it is convenient and doesn't run into some other structure:

 

[gkomo]

Wow that is expensive,i was not familiar with that pipe but i looked it up, by the time my quest for that perfect sound ends ill have probably that much into it,lol,to be honest in the last 30 years i have probably spent on my 2 Mustangs the price of a small house in need of repairs and they dont look any better than your average old 87 to 93 out there but i guess we spend money on things we enjoy.

I realized after i posted my comment and saw where you live that i guess that was more of an expense you had no choice in because the requirements in Cali for cars unlike most of us, sorry.

Yes unfortunately I have to abide by Cali rules, and they make you pay for it.

If @Noobz347 is correct and it can be as close to 1” of my narrowband sensor (but not inline, as in not right behind that sensor) then I should be fine.

 

[Praetorious]

Thank you so much guys,that really narrows it down! i did want to ask,when you say "Install the bung within 1 to 3 inches of your narrow band sensors" isn't the bung i am wanting to install THE narrow band sensor or is that something different? i figured i have my normal oem oxigen sensors which are of course 2 one on each side and then one more hole for the air fuel ratio sensor on the drivers side which is what im welding in.

 

[Praetorious]

I think i got it Noobz,when you were referring to narrow band sensors you were referring to the standard oxygen sensors,sorry about that and thank you for your help.

 

[JD1964]

I have an x pipe (unknown brand) and it crosses underneath the gearbox. I put my PLX wideband just aft of the x. This way im sampling an average of both cylinder banks instead of just one side. I have Magnaflow cats just aft of the x pipe. Formerly no cats. I didnt notice any power loss after installing the cats by the way.

 

[GOvert]

Soon at work, I/we will be installing a pair of O2 sensor bungs for the wideband O2 AFR gauge. These come with plugs. We are installing two and are purchasing these with the plugs in case we thought that we had an engine problem and wanted to momentarily swap to the other side. They will be 1.5" from the stock narrowband sensors and clocked at about 11 next to the narrows that are at 9.5.
O2 bungs with plugs
One of the best AFR gauge kits available
ADDED: Here is a link to just a pair but they don't have the step which I prefer. If you use the non-step ones, make sure the hole in the pipe is big enough for the sensor.
pair of two bungs without the step, with plugs

 

[DadLife0724]

You guys all seem so confused. I know exactly where my bung is located.

Thank you thank you, I'll be here all week.

 

[Noobz347]

You guys all seem so confused. I know exactly where my bung is located.

Thank you thank you, I'll be here all week.

When was the last time you checked?

 

[Bullitt347]

When was the last time you checked?

Exactly!
And, has he actually seen it?

 

[AeroCoupe]

I have an x pipe (unknown brand) and it crosses underneath the gearbox. I put my PLX wideband just aft of the x. This way im sampling an average of both cylinder banks instead of just one side. I have Magnaflow cats just aft of the x pipe. Formerly no cats. I didnt notice any power loss after installing the cats by the way.

So the wide band is located after your X but before the cats, correct?