Where to weld O2 bung on Fujitsubo catback exhaust?
#1
Where to weld O2 bung on Fujitsubo catback exhaust?
Hello --
I've been working on a turbo-back setup for my Evolution IX. It consists of a WORKS downpipe, WORKS HFC and Fujitsubo RM-01A exhaust. The Fujitsubo exhaust doesn't have a O2 sensor bung. Originally I was thinking about having a bung welded onto the HFC, but (in a separate thread), a number of you advised against it.
So... before I take the Fujitsubo to the muffler shop and have them start drilling and welding, I've taken some photos and marked where I think the bung should go. If you guys could let me know if I've picked the right spots for the O2 bung, I'd appreciate it !!!
My first guess is Option A, in hopes that the stock O2 sensor wires are long enough to reach this new location. Based upon my crude under-the-car measurements, I'm guessing 2.5" back from the flange, and slightly to the right of where the screw hole on the flange is.
Option "B" was based on some pictures I found online of exhausts that came with O2 bungs already installed. I'm thinking this one isn't as good of a location.
Top View of Exhaust
Option "A" and Option "B" of where to install the bung
Option "A" and Option "B" - closer view
Close-up of Option "A"
Once again, thanks for your help!!!
RedAustinIX
I've been working on a turbo-back setup for my Evolution IX. It consists of a WORKS downpipe, WORKS HFC and Fujitsubo RM-01A exhaust. The Fujitsubo exhaust doesn't have a O2 sensor bung. Originally I was thinking about having a bung welded onto the HFC, but (in a separate thread), a number of you advised against it.
So... before I take the Fujitsubo to the muffler shop and have them start drilling and welding, I've taken some photos and marked where I think the bung should go. If you guys could let me know if I've picked the right spots for the O2 bung, I'd appreciate it !!!
My first guess is Option A, in hopes that the stock O2 sensor wires are long enough to reach this new location. Based upon my crude under-the-car measurements, I'm guessing 2.5" back from the flange, and slightly to the right of where the screw hole on the flange is.
Option "B" was based on some pictures I found online of exhausts that came with O2 bungs already installed. I'm thinking this one isn't as good of a location.
Top View of Exhaust
Option "A" and Option "B" of where to install the bung
Option "A" and Option "B" - closer view
Close-up of Option "A"
Once again, thanks for your help!!!
RedAustinIX
#2
Evolved Member
iTrader: (3)
On the mid pipe right behing the HFC. This will reduce wire length. Also drill it in such a way that the O2 sensor does not hit the underbody of the car.
BTW, Perrin makes a 3" hfc with a pre-welded o2 bung. Notice that the bung is post-catalyst - so you can drill the cat portion in such a way to may a O2 sensor work rather than drilling the mid-pipe section...
BTW, Perrin makes a 3" hfc with a pre-welded o2 bung. Notice that the bung is post-catalyst - so you can drill the cat portion in such a way to may a O2 sensor work rather than drilling the mid-pipe section...
#4
XK120 -- not wideband, just the standard O2 sensor. It's located in the cat on the EvoIXs, and the general recommendation has been to move it to the exhaust when replacing the stock cat with a HFC.
4-BNGR -- when you say "drill the exhaust so the O2 sensor doesn't hit the underbody of the car", do you mean drill it so the O2 sensor is parallel to the bottom of the car? Or at a 90 degree angle?
Thanks,
RedAustinIX
4-BNGR -- when you say "drill the exhaust so the O2 sensor doesn't hit the underbody of the car", do you mean drill it so the O2 sensor is parallel to the bottom of the car? Or at a 90 degree angle?
Thanks,
RedAustinIX
#6
Evolved Member
iTrader: (3)
XK120 -- not wideband, just the standard O2 sensor. It's located in the cat on the EvoIXs, and the general recommendation has been to move it to the exhaust when replacing the stock cat with a HFC.
4-BNGR -- when you say "drill the exhaust so the O2 sensor doesn't hit the underbody of the car", do you mean drill it so the O2 sensor is parallel to the bottom of the car? Or at a 90 degree angle?
Thanks,
RedAustinIX
4-BNGR -- when you say "drill the exhaust so the O2 sensor doesn't hit the underbody of the car", do you mean drill it so the O2 sensor is parallel to the bottom of the car? Or at a 90 degree angle?
Thanks,
RedAustinIX
Nice pipes, btw. I like that the mid pipe retains the 2 resonators...
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