Wideband probe in stock exhaust

[TZepeSH]

Where would you recommend to weld the wideband probe in a stock muffler? I intend to swap my 4-into-1 to a stock or similar to stock exhaust because I can not install my tow hook with the dual quiet pack hanging low behind.

[woodsbuggy1]

Could you build a custom tow hook? If that is not an option, you would want to mount the 02 sensor where it has a mix of all 4 cylinders and as far away from the tailpipe exit as possible.
Good Luck
Kenric

[TZepeSH]

Hi Kenrick. I would rather not make a custom tow hook. It might not even be legal (the tow hook I have is GDW, with European certificate).
I considered welding the bung somewhere on top of the muffler. Having flow from all cylinders in a normal muffler is a bit hard, because it has baffles inside and some pipes... The muffler I am looking at is either a stock one (my 1.6 is not so pimped up, just an Engle W100, dual Dellortos and crank trigger. But I will swap to FI) or a CSP High flow.
I was just thinking if anybody tried to do it on a stock muffler permanently. For stock mufflers I made an adapter similar to a zoom tube with a bung, but that can not be a permanent install, it is just for tuning:

zoom.JPG

I have seen some vintage speed mufflers with O2 bung on the side. They seemed to be fitting in the same position as the stock muffler. But why have the bung at the side? It would get more gas from two cylinders.

VS.JPG

[Paul H]

I have my sensor fitted right in the middle of a stock muffler pointing out and up. It responds quickly to fuelling changes

[TZepeSH]

Thank you, Paul!

[okubricko]

TZepeSH,

I did the same thing as Paul. I used the curved part from this kit, inverted it, cut a hole in the exhaust, and welded it in place. Perfect fit for the Bosch LSU 4.9 wideband sensor underneath the tin and body.

O2 Bung.JPG

[sideshow]

Why not just welded the bung into the tail pipe, I realize that this collects 2 cylinders mostly and blends the other. But what is the problem? it one from each bank.
All it take is a spare tail pipe, knock the baffle insert out (making it bigger), weld a bung (making it smaller). The only side effect it is becomes slightly less baffled.
I actually did this once, but then realized that I had a new muffler that was easy to weld so I put regular baffles back in and looking from rear just use the flat section pointing 9'oclock (allows for shorter wire) it ran that way for years.