Afr bung on overpipe - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

sroby · 03-28-2017, 03:19 PM

I will be doing my sprintex install soon and am going to run an afr gauge. I need to know if it matters to have the bung welded on the header after the secondary 02 sensor or can I have it welded on my overpipe. I have already had my header ceramic coated didn't want to have to redo it. I didn't know if that location close up toward the front of the over pipe and not on the header, would alter the afr numbers or not. Thx in advance. Steve

Amputechture · 03-28-2017, 04:26 PM

Do you have a cat in your header? If not, then you'll be fine to place it there.

mav1178 · 03-28-2017, 04:37 PM

You can, but be warned that you will have virtually no access to it.

Much better to have it on the front end of the front pipe.

-alex

KnightRyderx2 · 03-28-2017, 05:06 PM

You could but that would be a tight fit. The best place for it is on the front pipe close to the over pipe.

Sportsguy83 · 03-28-2017, 06:00 PM

Quote:

Originally Posted by mav1178

You can, but be warned that you will have virtually no access to it.

Much better to have it on the front end of the front pipe.

-alex

Quote:

Originally Posted by KnightRyderx2

You could but that would be a tight fit. The best place for it is on the front pipe close to the over pipe.

I had the AFR bung in my overpipe and it was easily accessible and visible from right by the battery. I wish I had pictures.

mav1178 · 03-28-2017, 06:53 PM

Quote:

Originally Posted by Sportsguy83

I had the AFR bung in my overpipe and it was easily accessible and visible from right by the battery. I wish I had pictures.

I know which part of the car you're talking about, and yes you can easily access it... just a hell of a lot easier if it was under the car, esp if the bolt becomes difficult to take out.

-alex

sroby · 03-28-2017, 09:56 PM

Yea I am running the Gruppe-s uel no cat header. Invidia overpipe, Berk highflow cat front pipe and the q300 cat back. I have the overpipe and header Cericoated. I was just looking down like you had said and it looked like I had room on the overpipe. But if it would still give me an accurate reading there is plenty of room on the front pipe before the cat. So to be clear as long as I installed it in front of the high flow cat on the front pipe I will be ok? and again thanks for all of your help and support I get from the forum. Thx Steve

sroby · 03-28-2017, 10:00 PM

Alex, thanks partner, I just re read everything and you answered my question. I will put the bung on the front pipe just down from the collector but before the cat. thx Steve

Ultramaroon · 03-28-2017, 10:22 PM

Quote:

Originally Posted by sroby

Alex, thanks partner, I just re read everything and you answered my question. I will put the bung on the front pipe just down from the collector but before the cat. thx Steve

Do you still have the secondary cat? You could mount the bung downstream of that and make an extension cord.

That's what I'm planning on doing.

sroby · 03-28-2017, 10:30 PM

I do. I am running the Berk High flow catted front pipe. I get it now Ultra, for it to read the mixture for the af meter it has to be after the cat. in my case since the one is not in the header it has to be the secondary. I think I have that correct. Hell I am confusing myself now (Ha) It doesn't take much anymore. thx partner

Ultramaroon · 03-28-2017, 10:45 PM

Quote:

Originally Posted by sroby

I do. I am running the Berk High flow catted front pipe. I get it now Ultra, for it to read the mixture for the af meter it has to be after the cat. in my case since the one is not in the header it has to be the secondary. I think I have that correct. Hell I am confusing myself now (Ha) It doesn't take much anymore. thx partner

You can retain the cat-efficiency measurement function that way. Legit in the spirit of the exercise. I'm planning on keeping my OEM front pipe.

sroby · 03-28-2017, 10:46 PM

right on partner thx

03-28-2017, 03:19 PM	#1
sroby Senior Member Join Date: Oct 2014 Drives: 2015 Firestorm 08/05/15 Location: Dallas Ga Posts: 320 Thanks: 376 Thanked 122 Times in 76 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Afr bung on overpipe I will be doing my sprintex install soon and am going to run an afr gauge. I need to know if it matters to have the bung welded on the header after the secondary 02 sensor or can I have it welded on my overpipe. I have already had my header ceramic coated didn't want to have to redo it. I didn't know if that location close up toward the front of the over pipe and not on the header, would alter the afr numbers or not. Thx in advance. Steve

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03-28-2017, 04:26 PM	#2
Amputechture Senior Member Join Date: Aug 2015 Drives: 2014 BRZ Location: FL Posts: 424 Thanks: 49 Thanked 143 Times in 111 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Do you have a cat in your header? If not, then you'll be fine to place it there.

03-28-2017, 04:37 PM	#3
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,093 Times in 3,029 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	You can, but be warned that you will have virtually no access to it. Much better to have it on the front end of the front pipe. -alex

03-28-2017, 05:06 PM	#4
KnightRyderx2 Senior Member Join Date: Aug 2016 Drives: 2014 FR-S Location: Kansas City, should be the 808 Posts: 286 Thanks: 30 Thanked 141 Times in 100 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	You could but that would be a tight fit. The best place for it is on the front pipe close to the over pipe.

03-28-2017, 09:56 PM	#7
sroby Senior Member Join Date: Oct 2014 Drives: 2015 Firestorm 08/05/15 Location: Dallas Ga Posts: 320 Thanks: 376 Thanked 122 Times in 76 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Yea I am running the Gruppe-s uel no cat header. Invidia overpipe, Berk highflow cat front pipe and the q300 cat back. I have the overpipe and header Cericoated. I was just looking down like you had said and it looked like I had room on the overpipe. But if it would still give me an accurate reading there is plenty of room on the front pipe before the cat. So to be clear as long as I installed it in front of the high flow cat on the front pipe I will be ok? and again thanks for all of your help and support I get from the forum. Thx Steve

03-28-2017, 10:00 PM	#8
sroby Senior Member Join Date: Oct 2014 Drives: 2015 Firestorm 08/05/15 Location: Dallas Ga Posts: 320 Thanks: 376 Thanked 122 Times in 76 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Alex, thanks partner, I just re read everything and you answered my question. I will put the bung on the front pipe just down from the collector but before the cat. thx Steve

03-28-2017, 10:30 PM	#10
sroby Senior Member Join Date: Oct 2014 Drives: 2015 Firestorm 08/05/15 Location: Dallas Ga Posts: 320 Thanks: 376 Thanked 122 Times in 76 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I do. I am running the Berk High flow catted front pipe. I get it now Ultra, for it to read the mixture for the af meter it has to be after the cat. in my case since the one is not in the header it has to be the secondary. I think I have that correct. Hell I am confusing myself now (Ha) It doesn't take much anymore. thx partner

03-28-2017, 10:46 PM	#12
sroby Senior Member Join Date: Oct 2014 Drives: 2015 Firestorm 08/05/15 Location: Dallas Ga Posts: 320 Thanks: 376 Thanked 122 Times in 76 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	right on partner thx

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