I have a BNR sitting around i havent used in nearly a year. I plan on installing it again here in the next couple of weeks. IS there a restrictor pill that will work with factory turbo oil feed hard line.

 

you can always weld the stock hard line then drill a hole in through it. I think it is .065"

 

I bought a .065 restrictor pill somewhere on the net, a few brass fittings and teflon tape at Ace hardware, cut the hard line, and I rigged this up:

It may look a bit tacky, but works very well for my BNR stage 4. (The restrictor pill is silver-looking.)

 

ATPturbo.com sells the restrictors. but you will need to make a line or something like that

 

Is Brian at BNR suggesting the use of oil restrictors? The stock CHRA already has a restrictor on the inlet side under the thrust bearing. I don't have one apart to measure at the moment, but it's about that size or even smaller.

You can see it in this picture:

 

this raises the question of: if the BNR Stgae 4 is built from a stock turbo,should there BE a restrictor on it(aftermarket) ,IF the stock turbo had none?.(or was built into it already)?
It'd be like restricting the restrictor,wouldn't it.?

 

I'm pretty sure they suggest using a .065 restrictor, in the line.

 

My BNR was on my car for no more than 1 year and a 1/2. I did 2-3 15 psi pulls. the rest of its life was 9 psi.

TOwards the end before i took the BNR off: during long idles it would start to smoke. I would give it a few revs and it would make the smoke go away for a 2 to 3 minutes then it would slowly start smoking again.
I Also intalled an 85 psi oil pressure regulator. I was concerned the added pressure would really require a restrictor pill.

 

I never ran a resrictor on my stg 4 for years, just used the stock line no issues ever.
now that iv gone full single I use a restrictor..

 

where do people get the idea that you need oil restrictor?? all BNRs use the stock cartridge, stock cartridge does not need restrictor, same with most journal bearing turbos. if it is smoking it needs a rebuild. the last thing you want to do to a journal bearing turbo is restrict the oil flow

 

Thanks. I might try it with the stock hardline.

 

Be aware that the stock hard line has somewhat of a tendency to develop hairline fractures, mine caused an engine fire (oil leaking all over hot turbo = fire). I had a flex line built and I'll eventually have a nicer flex line built instead of going back to the hard line.

 

MIne is solid. But ill keep a look out. thanks.

Besides. If there was a oil burn smell any where near my car, i would freak out. Ive parked next to cars and started freaking until i realized it was the other car.=)

 

I e-mailed Bryan at BNR... I'll see what he has to say.

 

I e-mailed BNR Turbochargers. Not sure if this came from Bryan or an associate. This is the response I received.

"That's just a restriction for the thrust bearing. There is no function for that restriction plug because there are 2 (.040") feed holes in the thrust bearing. If it were a true restriction, it would be at the top of the turbocharger before it enters the turbocharger. That stock restriction doesn't restrict oil volume from getting to the journal bearings."

Referring to this: "The stock CHRA already has a restrictor on the inlet side under the thrust bearing."

Therefore...
.065 restrictor NEEDED.

 

Ask him the question directly. "Is it a MUST to have a restrictor pill on ALL BNR turbos?"

 

Here... Feel free to contact them yourself:

http://bnrsupercars.com/

I'll keep my restrictor pill in.

 

im not sure how you came to that conclusion.. he was simply saying the restrictor shown in the picture above only restricts oil to the thrust bearing, not the journal bearings. you want as much oil as possible going to the journal bearings

it comes down to this.. if you are running crazy high oil pressure and you are getting smoke, and you know your hot side oil seal is good, then run a restrictor. otherwise stock oil pressure does not need restrictor

 

^ +1

The restrictor under the thrust bearing limits oil volume/pressure to the thrust bearing and front seal. The majority of smoking problems are going to be from a leak at the front seal. At idle, the pressure differential is high between the CHRA and the compressor housing because you have vacuum on one side and positive pressure on the other. If you increase your oil pressure, you're going to increase that differential, and potentially run into sealing problems.

If you go an restrict the oil flow to the journal bearings and rear seal, you had better have higher oil pressure to make up for it. Decreased flow at stock pressure sounds like a good way to reduce the life of the bearings. Of course, if you're getting oil leakage past the rear seal, the seal is jacked or the housing has worn enough to allow a leak. Restricting oil flow may hide the problem, but it'll still be there.

 

I just dont get why is doesnt smoke at all but when you let it idle over 5 minutes it slowly start smoking. One or two 3k rpm revs and the smoke will go away for another 5 minutes.

ANyone ever have this prob?

 

I can see where gxl90rx7 and RotaryRocket88 are coming from. It was dumb for me to conclude that a .065 restrictor pill is necessary for each BNR. I do have higher than stock oil pressure, and must run the restrictor. This doesn't mean everyone is running similar pressure and must install the restrictor. I apologize for misinforming people.

 

I have a problem with a small drip of oil showing up on my turbine housing. When i sit and idle it will smoke under the hood from burning off the turbo. I called and spoke with brian. He said since i am running higher oil pressure i need this restrictor pilll as well. Never see smoke from the exhaust just small amounts coming from between turbine housing and center housing. Is this what the restrictor pill will help with.

 

I have the same issue, BNR basic rebuilt, s4 turbo, it leaks already the first day I have it installed. Called Brian, he suggest to add an oil restrictor which he will send one to me. What's the point of rebuilding if it still leaks??? I'm disappointed.

 

Make sure the oil feed and return line are completely dry where they bolt to the turbo.

 

I talked to Brian a few weeks ago about restrictors.

He said if you're running stock oil pressure you shouldn't need one, but if you're running higher than stock oil pressures you should add one. .065" is the smallest he would go.