It does look like the WUR would react to vacuum though doesn't it. Has anyone actually had a gauge on there and added vacuum to it and checked? I would have thought it would raise control pressure with vacuum just as it lowers it with boost. I know this has been discussed but it would be nice to have an answer from someone who has actually done this exact test
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan 
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