oil feed pressure?
 

what are the minimum and maximum oil pressures for the feed and return lines? I have an idea about something.

I would guess its the same pressure or just abit less than internal oil pressure!

Reason being, my Greddy Oil pressure gauge is "T" onto the oil feed line. And it reads 1.5 bar when the engine is hot at idle.

As for Return line, few people here said there is no pressure at all. And to support that you are required to have you return line at a downslope angle and letting gravity do the work only.

should be the same as what the opg displays in cabin...what's your brillant idea?

my gauge was teed in just before the restrictor at the turbo like so:
http://gallery.y8s.com/d/246-1/DSC00751.jpg

but I moved it to the other side of the block at the feed by the filter.

It was showing normal oil system pressure.

As for the difference between the feed and return, try pissing into a garbage can and tell me what the pressure in your bladder is compared to the pressure in the can. change in flow cross section will change pressure. especially if you don't have enough flow to fill that new x-sectional region.

Not sure what'd happen if you didn't run the restrictor though. maybe would drop overall system pressure and overwhelm the turbo seals?

I'm thinking of running a separate oiling setup for the turbo with a pump, cooler, and reservoir.

Why? What kinds of problems are you having that you want to do that. I ran a gauge at the turbo before and after a .075 restrictor at idle and full load. If you want those values I can find them. Though all they'll tell you is the drop is pressure using a restrictor compared to the overal OP of the motor.

I saw no appreciable difference in oil temp at the sump after installing my turbo.

a self-contained oiling system would eliminiate the need to tap the pan and would ensure the turbo gets proper lubrication. it would also be a very original idea. but I'm wondering if a constant 50psi would be too much at idle? because normally the pressure increases with engine rpm's. hmmm, time to think.

yes way too much. Corky's book gives the numbers you want.

can't wait till the aux pump fails. all this to save 15mins tapping a pan and 10secs unscrewing a bolt?

You are just adding complexity where none is needed. Tapping the pan and running the oil feed from the engines oil system is tried and true.

Hope the next idea is a better one :)

lol, we all get dumb ideas....

what about dumb?


lol...