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 |
BeatNavy |
Oct 29 2020, 10:45 AM
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#2
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
Good points, Frank.
In my case I had a 2056 and a 2270, both with a Raby 9550 cam. On both I used the Tangerine EVO II muffler with the bung welded right in the middle. On the 2056 with D-Jet my AEM AFR gauge seemed to provide valid idle AFR's. On the 2270 with Microsquirt using the PLX wideband sensor/gauge I get crazy lean idle numbers. It took me a while (and a lot of black smoke / smell and piss poor mileage) to realize this wasn't the case. I know it was calibrated correctly, so that wasn't it. Because of these readings I really can't go closed loop for tuning purposes. Weird. It could be aggravated by the cam, but on the 2056 I got totally different results. |
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