Thread: Turbo oil feed and drain tech. Do I need a restrictor or not?

yea, im running a gt3071r, does that have a built in restrictor cause i dont think it does but could be wrong. ill check my drainage and see how it goes...

I have the same turbo it has a built in restrictor. all garret gt ball bearing turbos have one. I am running a restrictor on mine because I have a -4an feed line.

my line is a little smaller then the 4an, im guessing 3an maybe? im not sure if its a drain issue or what since my oil psi is way higher then it was on the last motor

The oil can out flow restrictors. Lets say you have a .065" restrictor you might be okay at 50-60 psi, as the turbo might be seeing 40-50psi. Now at 100-110psi that restrictor is going to be letting the turbo seeing 80+psi.

Cortrim1 when you have two sized restrictors the oil pressure is set only by the smaller of the two. I have tested it both ways with a gauge.

200sx Se do what cortrim1 says and go over your drain system first. Does your PVC system enter your intake at all? If it does try rerouting it with a catch can or however just to see if that is where the oil is coming from.

im positive it coming from the feed or has something to do with the feed. there no oil anywhere else to know knowledge(will check sometime this week). im pretty positive its something with the feed and or drain. ill have to check and see

make sure the drain is clear. backing oil up in the turbo will kill it fast especially a bb unit. Leaking at the input is not a serious issue unless it come out of the turbo then its a big problem. Did you use new copper gaskets on the banjo fitting?

yea, not sure if they are copper but they came with the line kit. its not leaking any oil from the lines or anything, just noticed some oil in the turbo outlet portion of the turbo. funny thing was there was no oil in the outlet pipe connected to the turbo??? ill check the drain even though im sure it isnt clogged. im really thinking its the psi from the motor

I've said this for years. Oil backing up in your turbo is NOT a good thing. This is another reason NOT to tap the pan but to tap the block where it is designed to be tapped. At the quarter looking space near the motor mount.

Thank you Ben for posting this.

well im going to clean the oil out of the turbo. once thats done im just ganna cruise and daily it for a day or 2 and check to see if oils there. if not, then for a portion of the next day im ganna beat on it a little bit and the check again. ill see where that gets me...

From garretts website:




Oil supply