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 |
DRPHIL914 |
Oct 27 2020, 07:25 AM
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#2
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Dr. Phil Group: Members Posts: 5,768 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
zach, what muffler are you running? i had mine put in the Triad at the back center pipe that goes from the lower to upper section so its sensing gases from both sides where they come together.
Phil |
VaccaRabite |
Oct 27 2020, 07:39 AM
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#3
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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 |
zach, what muffler are you running? i had mine put in the Triad at the back center pipe that goes from the lower to upper section so its sensing gases from both sides where they come together. I had a Triad, with a bung in the exact same spot. I wanted something a bit quieter (and as it turns out a TON lighter) that did not give up on power. Zach, can you comment on what Eric told you or why you don't think your location is ideal? I've got a Microsquirt setup with Chris Foley's EVO II stainless steel muffler. He pre-welds a bung right into the muffler. I seemingly had no issues with it when I was running D-Jet but for some reason when I switched to Microsquirt (and a different O2 sensor) my idle AFR readings were completely useless for tuning purposes. Worse than useless. Kept pointing me to super lean when I was super rich. At throttle it seems ok, and I know tracking type 4 idle AFR can be challenging (so says Jake). Sorry, don't have an answer to your question, but I'm curious. I am using one of Ben's "Quiet" mufflers. The exhaust bung is in the base of the tail pipe. As long as there is open throttle, it works but is not ideal. The exhaust gas has cooled quite a bit by then. And there is reversion when I'm shifting or at idle which leads to false lean conditions. Latency was almost a full second. It was not a huge issue for the early rounds of gross tuning but it needs to be moved to someplace earlier in the exhaust system for more accurate fine tuning. When I had Ben build the muffler for me, he did warn me that sampling all 4 cylinders with one bung would be a challenge with this muffler. IMO its worth it over the Triad I was using before. The noise is tamed and long drives are not nearly as fatiguing and leave my head throbbing even with ear plugs. And the Triad weighs about 2X what Ben's Quiet muffler weighs. If push comes to shove I know I can monitor two O2 bungs with Microsquirt. I'd prefer not to do that, as I REALLY don't want to have to take apart the AMP Seal plug again. Zach @mb911 |
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