02 bung into SSI exchangers?, Which pipe is best. Does it matter? |
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02 bung into SSI exchangers?, Which pipe is best. Does it matter? |
VaccaRabite |
Oct 27 2020, 07:15 AM
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#1
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En Garde! Group: Admin Posts: 13,456 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
I'm doing some remote tuning through PMB for my injected 2056. The tune is close and I've been driving it but there are improvements that could be made now that I have had about a year and change since my last tuning session.
Eric suggested I move my O2 bung from the muffler (where I knew the location was not ideal but it got to sample all 4 cylinders) to one of the exchanger pipes (much better/hotter location, but only get to sample one cylinder.) Tapping into the Cylinder 1/2 bank would be easiest, and I was thinking of going into Cyl 1 since the pipe is shorter and maybe a little hotter. So now the question is what cylinder is the one I want to TIG weld the bung into. I don't track EGT so I don't really know if one pipe is hotter then another. And I want to eventually get heat back in my car so I can't go to headers which would allow me to sample all the cylinders before the muffler. Thanks! Zach @Eric_Shea |
mb911 |
Oct 27 2020, 10:18 AM
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#2
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914 Guru Group: Members Posts: 6,871 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
Tuning with the muffler that will be used every day is ideal. Its funny there was another thread recently about how all of mu mufflers should come with o2 bungs in them.. I felt it unnecessary as it is not an accurate way to measure.. It really should be in the heat exchangers.. The alternative would be in the inlet of the muffler however that would impede flow without doubt.
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JamesM |
Oct 27 2020, 02:07 PM
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#3
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Senior Member Group: Members Posts: 1,915 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
Tuning with the muffler that will be used every day is ideal. Its funny there was another thread recently about how all of mu mufflers should come with o2 bungs in them.. I felt it unnecessary as it is not an accurate way to measure.. It really should be in the heat exchangers.. The alternative would be in the inlet of the muffler however that would impede flow without doubt. No muffler swap on 914 heat exchangers makes enough of a difference to the motors fuel requirements to matter. If it did anyone running d-jet with aftermarket mufflers would be screwed. In theory putting the 02 bung in an exhaust manifold would be ideal but 914s don't have single manifolds that join all the cylinders so there is no option but to compromise. Options are to put it in the heat exchanger pipe and only measure 1/4 of the gases or put it later in the system.. Wideband O2 sensors have integrated heaters so distance from the head from a heat perspective is not a problem, only becomes an issue when its to near the exhaust exit that fresh air gets back in and messes with the readings. Generally you want to be as close as you can get it after the pipes merge and before the muffler. The Bursch mufflers are probably as good as you can get with stock heat exchangers for O2 placement. the Triad looks promising, its just unknown atm how much fresh air gets back in with those. |
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