Oil restrictor for S14 T28 install on redtop

[CMG]

I'm putting in a S14 T28 into my S13 redtop and have already done the reclocked plates, modified oil dump, and using SS lines. Last thing to figure out is the oil restrictor. I have heard that there is one already in the turbo, that the stock banjo bolt is one, or that I need to buy a seperate one. Which is it?

[CMG]

So it took me a while to figure out but the S14 T28 does not have a restrictor inside of it, you need to use one. The stock banjo bolt is a restrictor, so if you're using stock hard lines you can just use that. If you use stainless lines you need to buy one. Quick question? The CS lines have -4AN for the oil fitting right? Anyone know the actual measurement of the restrictor hole?

[boro drift]

The AN fitting is the restrictor. I don't know the orifice diameter, but it's small.

[CMG]

There is an AN fitting that comes with the CS lines, but it is not the stock restrictor size. The stock size is real tiny, maybe .6mm. Trying to find out the measurement for sure so I can get the right size.

[boro drift]

Do you even need to restrict the oil for an S14 turbo? It's not a full ball bearing like the S15 spec R.

[CMG]

From what I've read it's part ball bearing or something like that. Better to be safe than sorry, don't want to blow the turbo. I realized that with the CS lines you still have to use the stock banjo bolt to mount them anyways, and that already is a restrictor, so that's all you need. I'm almost doen putting eveything together and gonna get it on the car this weekend. I'll post pics and info in my other thread about the S14 T28.

[boro drift]

I'm sure as long as you have the AN fitting that came with the lines you will be fine.

[CMG]

Yeah, that AN fitting was fairly long though, and the hole on the turbo is shallow. I had to use an exhaust manifold spacer to put it on and give it some tension so that it didn't back out. Do you already have a T28 that you put in?

[Seishuku]

Use a restrictor, a 1/16 orifice. -3AN is still too big, that's 3/16 ya know. It might be ok for a little bit, or for one turbo, but not another, but it'll probably push past the seals after they wear down.

[boro drift]

Yeah, that AN fitting was fairly long though, and the hole on the turbo is shallow. I had to use an exhaust manifold spacer to put it on and give it some tension so that it didn't back out. Do you already have a T28 that you put in?

Yes.

[johnnyballs180]

i just want to make sure i understand correctly..

the s13 t25's restrictor is the banjo bolt. the s14/15's BB turbos needs a smaller restrictor size (0.03"?), unlike the journal bearing t25 (0.06"?).

right so far?

if so, then the s13 banjo bolt will allow too much oil to enter the t28 bb turbo without an additional restrictor. wouldn't the s14/15 banjo bolt be the appropriate choice then? and would it fit in place of the s13's?

also, i've heard there are some journal bearing t28s as well as bb t28s.

i'm trying not to sound dumb, but i'm still learning all these differences.

[Blown240sx]

ATP Turbo sells the .035 restrictor fitting and .060 fittings. The 35 is BB and the 60 is for Journal.

[CMG]

The stock sr20det s13 restrictor is in the banjo bolt to the block. That is the size you need for S14 T28 turbos, I don't think you need to go smaller. From what I can tell, as long as you use the stock banjo bolt the restrictor issue is taken care of. Someone correct me if I'm wrong.

[johnnyballs180]

i googled and googled and googled, and hollllly crap! there's a lot of discussion about the s14/15 turbos. without actually ripping a bunch of s14 turbos apart, i wouldn't know how to begin to tell if it's bb or not, unless i were to look at the part numbers and compare them with garrett?

http://www.turbobygarrett.com/...t.htm

i've been sitting here for hours trying to figure this one out. i feel like i should know this by now.. but i've only dealt with a couple turbos of my own so far.. my old t25 and my gt28r (which i guess is now called the gt2560r now?). if it ends in "R" then it's bb.

i got away from the american forums and checked out a bunch of the australian ones, and a lot of them are saying that all of the JDM s14 turbos were bb, while in australia and the states, there were some of both.

maybe you guys can verify/clarify?

CMG, i'm not trying to put your d!ck in the dirt or anything like that, but i've been really wondering about the whole oil supply thing ever since that recent thread about the w/g actuator rods and AN fittings being in the way.

[CMG]

Restrictor may not be essential, but it won't hurt.

[johnnyballs180]

CMG, what are you doing with your car anyway? DD/fun? just curious. here, you can't own more than one car without a special waiver. i always wanted to build a car, piece-by-piece, and learn from that. trial and error doesn't hurt as bad when "error" doesn't mean taking the bus. i'm moving to the states soon, so i'll have my shot.

[CMG]

My 240sx is my toy car, being completed for track but still street legal. Started as a $700 chassis, selling the blown KA and transmission for $200 so $500 for the car. Did the swap in my side yard using a Silvia front clip, then sold off the Silvia front end and stuff so complete swap done right was $2000 total. Tons of stuff on the car with tons of stuff waiting to go on. I've used the stock T25 for a while, but then my turbo bolts backed out, so I had to pull it anyway and I got a good deal on the T28 so I decided to upgrade. Had to wait for various parts and figure some things out so it's taken way longer than planned to finish, but doesn't it always? I'll post up some pics later.