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Also, some systems accuracy depends on its ability to cool the exhaust and remove any water in the exhaust. It may have had a hard time due to the extra heat of being upstream.
Just a thought
ahhh maybe thats what I was trying to say
Im not sure how those things work...but your explanation seems more educated so lets go with that
The dyno wideband was in the DP....it was designed to be in the tailpipe. It possibly overheated since the DP is upstream and gave a bad reading
yea i remember when i first got my wideband I had it placed in my exhaust manifold because I hadn't gotten around to welding in a bung lower down in the dp after the turbo and it threw the readings way off. The Afr would show random lean spikes all over the place, but it wouldn't read lean straight across..mostly just spikes that looked like misfires.