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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,646
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Damon, With a relatively new WUR, I think you can rule that out as a source of the AFR changes. FYI: I'm running an M1 cam, with more duration than stock, so that should reduce my vacuum somewhat. But that still doesn't account for the AFR behavior, because the WUR CP increase is already maxed at 10" vacuum on my 089, and maxed at even lower vacuum on my 033.
When you step on the gas, the intake vacuum drops dramatically, to near zero at WOT. So the WUR decreasing the control pressure should enrich the mixture and AFR reading, but it seems that it does not. A puzzler.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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