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Mark,
In my own testing, I found that the WUR responds only to boost pressure by lowering control pressure. It does not raise control pressure under vacuum. I believe others here (Alan L comes to mind) have had the same result.
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Jacob
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
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