^^ His 'scavenge' pump is a tiny little 12volt oil pump, it will never evacuate the crankcase enough to even keep up with the blowby, forget about it pulling a vacuum.
Maybe a second power steering pump could be utilised to evacuate the crankcase and the turbo sump, delivering the oil to a separator with a gravity return to the sump and a breather to expel the blowby?
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