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: 13,465 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: 6,879 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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Frank S |
Oct 29 2020, 05:39 AM
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#3
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Member Group: Members Posts: 135 Joined: 15-April 15 From: Wiesbaden, Germany Member No.: 18,632 Region Association: Germany |
QUOTE 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. Why? I would agree to the statement for a Narrowband Lambda Sensor as they are not temperature controlled. Is there really somebody still using Narrowbands? From my data there is almost no difference between the sensor location at the inlet of the muffler to the center where it is much cooler. Also the Widebandcontroller is indicating a good operation temp. range. |
Mark Henry |
Oct 29 2020, 07:32 AM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE 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. Why? I would agree to the statement for a Narrowband Lambda Sensor as they are not temperature controlled. Is there really somebody still using Narrowbands? From my data there is almost no difference between the sensor location at the inlet of the muffler to the center where it is much cooler. Also the Widebandcontroller is indicating a good operation temp. range. 14point7 (Alan To) disagrees with you, but what does he know he only builds wideband controllers. |
jd74914 |
Oct 29 2020, 07:58 AM
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#5
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Its alive Group: Members Posts: 4,782 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
14point7 (Alan To) disagrees with you, but what does he know he only builds wideband controllers. Where is that said? Not trying to be argumentative, but curious. I'm interesting in reading his reasoning... I'm not seeing a thermal issue either, assuming the sensor is hitting correct temperature setpoint. Sure, you're likely to see a little less free O2 further out (conversion from CO to CO2 takes some time), but other than that I can't really see an issue. Obviously, reversion is an issue as you're introducing free air into the muffler, but this isn't something that always happens. |
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