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

Except the seals are not symmetrical. They can hold a lot of pressure from the oil side. They actually make use of high pressure on the oil side to keep the seal operating properly.

Pretty interesting but we still need restrictors and specific ranges of oil pressures depending on the set up, no?

I have had 3 t25s puke oil up, oil in the OE set-up only adding a VE oil pump. The problem went away when I put a psi gauge in line via the oil feed and decrease the oil pressure to the turbo, or so I thought

what's the proper restrictor size for a t25?

I never ran restrictor on my car. It was a t25 setup with a -3 line. My car had a VE head ontop of a stock de bottom end with a stock oil pump. So I had the VVL oil feed+t25 feed, yet I never had any oil pressure issues.

With the stock pump (depending on the oil you are running also) your oil pressure is going close or under what the manufacturers specify for a journal bearing turbo. If you had the VE oil pump with the head you would be more likely to run into the trouble I had. The VE oil pressure can get 50+psi higher at times.

Do you have an oil pressure gauge on your car? If so what is the lowest pressure you see and the highest? Is it a ball bearing or journal?

this is interesting. ever since i put in my det the other week i noticed my oil psi is alot higher then my uk+t. im using the det restricited banjo bolt i see 20psi low and around 60+ high. now im seeing oil in the turbo houseing that i connect my outlet pipe to. turbo is a t2 gt30r

That restrictor is too big for your ball bearing turbo. I suggest you find a smaller restrictor or make the one you have smaller.

Where is your turbos oil feed source? If it is the front of the block your det banjo is only dropping about 10psi or less from the oil pressure the turbo sees.

yea, its from the front of the block. those psi reading i gave are coming from the back of the blockl, where the filter assembly is. i was wondering if i needed a second restrictor or something cause even though that banjo hole is small, i didnt think it would still flow that much. im not sure why this motor is seeing so much more oil psi compared to my last one either.....

the turbo has a built in restrictor along with the restrictor that is in the stock line you should be ok. Remember the drain is more important on a bb turbo.