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Originally Posted by cando
Most seals only seal in one direction of flow.
ex. Put the seal on your crank backwards and you'll dump out the engine.
Without knowing what type of seal it uses, buying it would be a gamble based on assumption.
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The crank seal, I assume, is a lip seal or a garter lip seal and yes, they do seal better in one direction than another. This WG almost certainly doesn't have either of those. An o-ring would suit their purpose perfectly and that's what expect they've used. O-rings seal in both directions like many other seals.
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That would also assume you're at (or have the VCV adjusted to) idle conditions while cruising.
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Good point. If I try this, it's going to be in a landcruiser transplant which will have a manual trans. I'll have the luxury of tweaking the VCV and even more drastic vacuum system manipulations for boost purposes without worrying about shift issues. A manual trans is the only logical test bed for this setup. I would be happily surprised if a good vacuum curve for the trans translated to a similar curve for the WG actuator.