I need a oil restrictor please explain operational difference from -4 to restrictor
 

Looking for a explanation of how it likely effects the system due to the pressure reduction from supply restriction.

The restrictors hole size is ~0.035" 0.9mm
A -4 line is ~0.158” 4.01mm

This is for a GT35/40

How much oil is even required in that center section ? This turbo doesn't rely on this oil for any substantial cooling? It is a water cooled turbo.

Can anyone explain what the volumetric supply change does for the internals if the size of the line is restricted by that much? How does it effect the internals?

Knowing that that turbo is not necessarily designed for this application, how would its intended oil supply differ that it seems to require restriction in this rotary application? Does the REW have particularly high oil supply pressure? Is there some other related factor requiring the restriction?

My drain should be at atmospheric or vacuum, so the drain should be sufficient for that tiny in comparison -4 oil supply.

If it needed that much restriction, why don't they simply come like that with internal restriction?

Does anyone maybe have a better cutaway that will show how the oil is distributed on the inside of the center section?

A small orifice like that restrictor will Always supply a center section with enough oil even at low RPM and low oil pressure? My assumption is that a ballbearing center only needs a film of oil?
How is the oil from the supply line distributed to the bearings specifically? Jetted, dripped, in the path of flow?

Because of the ball bearing construction , what causes this design to typically require the oil supply restriction over a bushing type center section? Is that typically true?

What is the sealing mode from oil bleed through with this GT35/40? I read they are like a piston ring?

I am having trouble understanding where the back pressure and restriction is being developed on my setup.

How does the center section develop enough pressure to push oil through the exhaust side seals? Maybe if I understood the oil flow path better through the center section it would help. Is there internal restriction in the center section despite the large oil exit?

I have a smooth unobstructed full 3/4” clear drain to pan. The turbo oil outlet is maximised.

I have the lower pan and filler neck vented to the turbo intake with 6mm ID line. So it should be under vacuum which increases with RPM... I have tried venting to atmosphere.

On moderate acceleration I can get the puffs of smoke. Presumably higher oil pressure pushing through the turbo seals into the exhaust?
Is this the typical mode of oil leaking causing smoke clouds?

Does the cold side not really have this issue of leaking? Is the cold side of a different sealing design? Or just harder to get the oil into the intake stream causing a noticeable correlation with the smoke?


This is for a GT35/40 on a streetport REW

I am fairly confident (as confident as I can be) that the seals are good on the turbo.

Can I supply any information to help understand this issue in better detail?

Is there a optimal size orifice for the restriction?

Is there perhaps inline adjustable solution?

Are there any disadvantages to restricting the oil that much?

Is there a possibility of wear or damage from restriction?


Can anyone please explain in detail the questions and concerns above from experience?

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