IGY

The size of the restrictor depends alot on oil pressure. My car hits 150psi of pressure max, if I run anything bigger than 1.6mm I get smoke. I run a -12 return also. If you have a car that only hits 80psi you can run a bigger restrictor. I have never used or seen anyone use a restrictor on a Mitsubishi turbo when they used the feed line that came with it. Every Garrett turbo I have ever used required some sort of restrictor to keep it from blowing oil, even when a Mitsubishi feed line was used. I know HKS sells an oil inlet adapter that bolts on that has a 1.5mm restrictor built in.

turborotor

I never heard of this. All i use is a -4 AN line and i haven't had any problem with smoke.

DuMaurier 7

IGY , what did you do to get your oil pressure up to 150 ?. , I am presently running 9000rpm,s and would like to go up a bit more to about 10,500 .

IGY

Well to tell you the truth, I did nothing. I have tried changing the oil pump and checked the front cover oil pressure bypass. The last thing to change is the regulator. I have been waiting until the next time I pull the motor to systematically change things. 150psi is just a little to high for my liking. The damn motor is coated in oil because it blows past all the seals everytime I rail the car. I originally thought it was a sticking requlator, but I played with it and it seemed to be OK. After changing everything else I am leaning toward a bad regulator again.



Doesn't your oil pressure go to 110-115psi? Every stock regulated FD motor I have seen an oil pressure gauge on has gone to 110-115psi. As a general rule you need 10psi of oil pressure per 1000rpm's.

DuMaurier 7

Yeah i see about 110 psi , keeps ****** up my oil pressure gauge sender (100 psi) .

IGY

Ha ha, cool. You have a secondary bridge and have only reved to 9000rpm's? Dude, it's way more fun if you go to atleast 10,000. With 110psi you are good to 11,000 rpm's technically, let that bitch rip! Don't forget to have someone take a picture of your face after you get out of the car, the look is pricless.

setzep

We both have -10 (5/8"), -12 is 3/4"

So they never put restrictors in the mitsu "kits"?? Maybe I should try to run a larger orifice than the .081" (2.06mm) I have in there now then. After ~3000 miles of driving the turbo still feels the same as far as shaft movement though.. hmm I just have stock 13B-RE oil pressure so maybe I could get away with a bit of a larger orifice?

DuMaurier 7

I plan to go up to about 10,500 eventually , but I have to hold up at 9000 until I fix my fuel problem , my ****** clutch is SLIPPIN AGAIN !!! , have to hustle up on the OS swap . I had my turbo re done with all new seals bearings (free of charge of course) and I am still getting oil smoke at the higher revs , my oil feed hole is 3/16 , the supplier "down under " says that the turbo will leak oil at any inlet pressure above 105 psi !!! , they suggested trying a "lighter" oil , I use 50 body they said to go down to 40 , what ya think ??.

IGY

Ok, I have no experience with your turbo, but I run a restrictor a third the size of what you have on my big shaft T series housing. If it was me, I would be looking for a second opinion before I changed the weight of oil I was using. Oh wait that's what you are doing here. You should be seeing between 45-60 psi of oil pressure at idle on the bridge. If smoke is comming out the turbo then you are getting too much flow and the center cartridge cannot drain fast enough. If you go down on the restrictor size, less oil will enter the housing. There should be no/very little pressure in the housing.



This is an example, in no way are the numbers accurate they were picked out of thin air to make a point. With a car that makes 80 psi of oil pressure you will get 10 oz per second through a 3/16 size hole. At 110 psi you will get 14oz per second through the 3/16 hole. If you make the hole 1/8 and run 110 psi you will be back down to running 10 oz per second again. So high pressure smaller hole will = the lower pressure bigger hole volume.



If it was mine I would make the restrictor 1/8" and try it.

DuMaurier 7

Actually I was wrong about the oil feed size , its actuallu 3/32".