How is your turbo sump/collector vented ?
I have run several turbo's low mount, current one uses a piece of 40x40mm square tube about 120mm long that bolts to the bottom of turbo oil drain(crush tubes in bolt holes).... that is all the sump that is required. The square tube has a -6 fitting welded in bottom corner that the scavenge pump sucks on and a -6 vent in the top that is plumbed to catch can, pretty much atmo.
Have run garrett and precision turbo's like this with no restrictor.
What is the issue you are having ?
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MY99 WRX EJ2.35L 720whp 9.48@147mph
https://youtu.be/c_lYEG0_Dyo
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