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Re: Improved S-Knob

> If you put a check valve in the circuit to the cap you will build up 
> pressure and hold it, causing strain to the wastegate diaphram. Well, 
> likely some leak, but you really don't want to break that hard to get 
> bit of plastic (rubber?).

Fiberglass reinforced silicone rubber... and it ain't designed for more
pressure on top than below... the natural shape has an upward curve at
the outer edge as you move towards the center then it curves back down
again.  Pressure on top with vacuum below would tend to reverse this
leading to tears around the edge.

Of course, if you use one of my red diaphragms, then I think you would be
fine (and need virtually no pressure on top anyway due to the stiffness
of the diaphragm).