Are you trying to keep the turbo supply side oil pressure low as to not over come the seal, or some other reason? I am not turbo tuner, but most of the guys I know who build their own turbo systems just tap into an oil galley or tee off the high pressure side of the oil pump and use unrestricted oil pressure through a small diameter line, -3 or -4. At least that's what I thought they did...
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