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I think I've got the question confused then, or maybe I'm confused. You have one oil line on the bottom the of the sump. This comes right after the oil pump and before the oil filter. This line supplies unfiltered oil to the waste gate which is controlled by the bellows on the controller and returned to sump.
The turbo line comes after the filter, from the oil galley on the side of the engine. From there into the turbo and back to sump via the scaveng pump. Thus two completely different systems.
There has been debate on the unfiltered oil that comes from the wastegate supply side. And other studies that depict the oil supply for the turbo as a poor choice for volume sake.
So, if you supplied the turbo from the lower sump, and the wastegate by the oil galley. The oil pressure is the same at either point on the engine.
I'm just trying to understand the system. Maybe I have it all wrong. Someone please correct me if I am.
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