Forums/Z31P/z31-basics basic-modifications-basic-questions-aka-the-newbie-forum/Certified Muffler downpipe, o2 sensor bung size question
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Z_Karma: (2016-09-13 01:30:17)
Those of you who had a bung welded onto your downpipe, do you recall what size it was.
It's much larger than the M18x1.5 that is typical, this is more like a m22 size. I did call CM
and he was like…i dunno, whatever is normal i guess. The guy was no help at all.
I have tools to measure the thread pitch and can use calipers to measure the ID and with
those two measurements should be able to find something at McMaster-Carr, but i thought
i'd ask here just in case. Auto parts place and ACE hardware were strike outs.
Althouth a 15/16 flare fitting for a gas line did thread in loosely at ACE. I'm just looking for a plug as of now.
Pace: (2016-09-13 14:48:01)
I didn't have an O2 bung welded to the downpipe - used the original in the turbo elbow. But I can attest to the eccentricity of the guy at CM. He kept asking what axle-back exhaust I was pairing with the downpipe/test pipe combo I had ordered and then started ranting on how people keep copying his exhaust components. Bit of a nutjob.
shromy: (2016-09-13 16:56:08)
are you sure it is not an AIV port
Z_Karma: (2016-09-13 17:44:38)
You got it,. Shromy.
It is an AIV port.
It's M24X1.5. (same thread pitch as a Toureg oil pan fitting, Dorman PN 65415, for reference)
I dug up the invoice from 2013 and i forgot i indeed ordered it with the AIV fitting. The AIV system is now deleted, i'm a dumbass.
Would it be easier to grind off the fitting flush and weld in a M18 bung than try to find a reducing bushing to M18 from M24x1.5.
That is a unicorn fitting.
Or, does the sensor need to be in the exhaust stream, i mean if i could tap a M24x1.5 plug for M18, could the wideband be adjacent to the exhaust flow and still be accurate.
88sinZ: (2016-09-14 02:32:47)
I like to shove the invoices in a file cabinet, never to look at them again
I've got a mild steel 18x1.25 bung from the Innovate wideband kit P/N 3839 that i'll never use - it's the tall bung, not sure if that makes a difference? cover shipping and it's yours
from what i've read ideal WBo2 placement is 18-24" downstream, with at least the same length behind it.You'd probably be better cutting away and welding in a plate and bung over the flub-up
Augustus Maximus: (2016-09-14 06:12:31)
Bung usually comes with the wideband.
Z_Karma: (2016-09-14 14:47:23)
I like to shove the invoices in a file cabinet, never to look at them again
I've got a mild steel 18x1.25 bung from the Innovate wideband kit P/N 3839 that i'll never use - it's the tall bung, not sure if that makes a difference? cover shipping and it's yours
from what i've read ideal WBo2 placement is 18-24" downstream, with at least the same length behind it.You'd probably be better cutting away and welding in a plate and bung over the flub-up
I'll take it man, thanks!
Can you shoot me an email to zkarma@gmail.com? I can't PM until i clean out 446 messages or something from my messages folder, cleaned out a bunch but the number isn't going down.