Both of my turbos are out for a "they needed it anyway" rebuild. But I was wondering if using too large an oil supply line might have something to do with my leaking problem as much as failing seals. I'm running a 1/4" tube to a T fitting, then 1/4" tube to each turbo. My engine sees 60 psi..even when warmed up with 5-30wt.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

60psi? At what RPM? That seems a little high.

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

Pretty much anything above idle. Melling 55 w/ HP relief spring on an all new motor.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

the OP is a bit excessive, but I dont think that it will hurt the Turbo's. they push through an orifice & I am sure that it does not like that OP all the time but I can not see that it is a big deal. I think that it is more likely to get hurt if the return line is too small or kinked.

I am not a turbo Guru, but that makes pretty fair sense to me.

BW

 

Make sure the return line isnt kinked. The return line MUST go in the pan ABOVE the oil level. If not, the oil coming out of the turbo will get backed up in the line and push its way past the seals.

 

Oil Pressure isn't so high. I'm running the same right now. I don't think the stock gauges are 100% reliable. A good rule of thumb is 10 psi per 1000 RPM.

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'87 Bird 350 .060 over 700R4 + Lots more

 

The return line uses 1/2" fittings. no kinks or anything. I wasn't sure if 1/4" under high pressuse would deliver too much oil even for that to handle without leaking out of the shafts.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

I don't think you're getting too much oil - seems fine to me. Like what was said - you need a big, clean, non-horizontal run drain line. For reference, my oil comes from the oil plug near the top of the bellhousing from a T (I think 1/8 NPT to -4AN), -4AN lines to a -4AN/ -1/8NPT elbow into the turbos. The drain is a vertical 1/2" NPT/-10AN fitting to -10AN line, to a -10/-1/2" NPT 45 degree into the oil pan at the front, above the oil level.

A.