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Downpipe Extra Unused Fitting

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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rrres
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Downpipe Extra Unused Fitting

Post by rrres »

Noticed that there's some kind of tack welded fitting on the down pipe, just before the flex pipe. What's this for? It doesn't look like a threaded fitting. I'm looking for a place to install an o2 sensor for an AFR gauge and was wondering if I can use this.
downpipe extra fitting.jpg
downpipe extra fitting.jpg (79.56 KiB) Viewed 524 times
It's blowby
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scot850
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Post by scot850 »

Do you have a heatshield?

Neil.
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rrres
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Post by rrres »

scot850 wrote: ↑26 Dec 2022, 19:45 Do you have a heatshield?

Neil.
Yeah, It has a heat shield and was temporarily removed in that photo. It was held on by three bolts: one on the downpipe flange, then the other two bolts at the top of the exhaust manifold. The fitting in question is way down there, next to the angle gear flange. It's about 3/4 inch diameter with an 1/8 inch diameter center hole with some kind of pin sticking out of the center hole.
It's blowby
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scot850
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Post by scot850 »

No idea what the lower one is for. Sorry.

Neil.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
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Sveedy
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Post by Sveedy »

I'm no expert, but I think that location would be too close to the turbo. I seem to remember that when I installed mine, it was to be installed apx 18" away from the turbo. I am using the front o2 sensor bung for mine, but I have a tuned ECU from Vast, and Aaron has instructions on how to do that switch.
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Sveedy
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Post by Sveedy »

https://www.vasttuning.com/wideband-lambda-control/
Try to learn life's bad lessons vicariously through others.


1996 850 Turbo GLH ( Goes Like Hell )
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rrres
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Post by rrres »

Thanks for the replies.

I was watching the "SimplyVolvo" youtube channel and saw that the downpipe on his 850 had two of these tack welded things.

I found another photo online which shows the same things.
DOWNPIPE-FLANSZA-VOLVO-V70-S70-XC70-850-WYDECH.jpg
DOWNPIPE-FLANSZA-VOLVO-V70-S70-XC70-850-WYDECH.jpg (97.08 KiB) Viewed 441 times
It's blowby
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VanBoisvert
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Post by VanBoisvert »

Have you installed it? I am waiting for your reply. Please reply to me soon.

Edit: Still waiting.
Last edited by VanBoisvert on 27 Oct 2025, 23:48, edited 4 times in total.
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Chuck W
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Post by Chuck W »

Is it mounting for additional shielding or whatever due to it being AWD?
'97 854 T5 - Manual Swap/M4.4/COP/NA cams/P2R Brakes/16T/ chassis bracing/ XC70 nose swap
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