Originally Posted by wheelhop
This is your answer. Don't guess. DSMs kill SO many journal bearing garrett, BW, holset turbos. Because they are all more sensitive to oil changes and especially over oiling. And DSMs change their oil pressure per setup, rpm, motor build, oil pump age, Bshafts, oil pump years, oil cooling, hair part, shoe lace orientation, etc. FAR more than any other engine on the planet. PTE has a bad rep because of sh!tty DSM oiling problems. Its DSM oiling that sucks, not PTE (AKA garrett center sections). It's not the manufacturers fault. Its the haphazard, random oil pressures that dsms run on various setups.
Use any gauge: oil gauge, old fuel pressure gauge, old air compressor gauge, old water pressure gauge for home water feed lines, who cares. Get SOMETHING on there after the lines and restrictions to actually see what your oil pressure is. Rev the motor in neutral and find out the oil pressurea at idle, theoretical spool up rpm, and peak oil pressure (should be at redline). Per the holset repair manual for the hx35/hx40: Warmed up, the oil pressure for the hx35 and hx40 should be no less than 10psi at idle, and no more than 72 psi. It should be no less than 30psi at spooling time and after. A bolton hx35 sees 20psi at about 3700rpms and spools damn early so you had better have 30 psi at 2K or you could be eating turbo bearings. An bolton hx40 sess 20 psi as early as 4K on a 2.0L motor. Check your oil pressure. As stated, you MUST have 30psi during spooling up conditions with these turbos. And you cannot have more than 72 psi pressure at full song.
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