GT2871R oil restrictor

[Nissan_Power]

Hi guys !

Im new to this forum, but am looking forward to learning from all of you.

I have a question : I just installed a GT2871R on my redtop sr20. I had my head checked, cleaned, new valve oil seals and valve guides. When i start the engine, it lets go a white puff. If i rev the engine on neutral up to 2000 rpm it will smoke white too.

The thing is that my motor didnt smoke white before I sent it to the machine shop Any Idea...i would have said valve seal, but they're brand spankin new (or the machine shop broke one)

Other question, any of you guys that installed a GT2871R on a redtop sr20 with braided lines from Circuit Sport used an additionnal oil restrictor ????

Please help, summer is almost over here :-/

[Sileighty_85]

there is no restrictor in the turbo to begin with, you need to add one on the oil feed at the block
Cannot remember the size though
http://i73.photobucket.com/albums/i235/Neil_85/VFSH1235.jpg

http://i73.photobucket.com/albums/i235/Neil_85/VFSH1237.jpg

but white smoke usually means coolant

[Nissan_Power]

I saw a bubble flare looking thing with a tiny hole in the oil inlet of the turbo. It was the size of the ball in a bic pen.

And another thing, i cant put a restrictor on the block, a banjo fitting hooks up the lines at the block.

I was told by a sales-person from the company i bought the turbo from that I dont need a restrictor for my gt2871r because they sold me -3 braided lines and that they only put restrictors on -4 lines....sounds like bull**it to me, sounds like they sold me useless lines...

What do you think, makes any sense to you guys ???

[Sileighty_85]

thats just for the flare fitting its not a restrictor.

The OEM banjo bolt has a built in restrictor, but if its from a red top then it wont work, BB turbos need less oil pressure, the S14 one should work fine though

[fliprayzin240sx]

Restrictor goes into the turbo. I just bought ISIS top mount lines and I had to buy the restrictor seperately. Only certain lines right now comes with built in restrictors (only Taka lines comes into mind). You need the restrictor or you'll push too much oil pressure on the turbo and blow it later down the road. Pop the oil feed line into the turbo itself, see if the brass fitting is a restrictor. Should be fairly small, about the size of a ball point tip. Most lines will have a fitting that has an opening the size of a pencil eraser.

[singlecamslam]

I just bought a .03" for my s15 spec r turbo, is that the right size? Sorry to thread jack, and to install it i would bolt this into the turbo itself right? I have aftermaket lines so i would just unbolt the oil feed and bolt the restrictor in there? thanks.

[Sileighty_85]

all depends on the restrictor design

like mine i posted the siver adapter bolts to the block >the the brass restrictor bolts to that> then the turbo line threads to the restrictor

[singlecamslam]

i bought this one Taka Ball Bearing Oil Restrictor (-3AN) : *Clearance Special!* (http://www.phase2motortrend.com/babeoilretsi.html) so that means i need an adapter for the block so i can bolt on the rest right?

[Nissan_Power]

thanks sileighty_85 and fliprayzin240sx...taka motorsport restrictor on the way....

Could NOT having this restrictor cause some oil burning ???

[Sileighty_85]

i bought this one Taka Ball Bearing Oil Restrictor (-3AN) : *Clearance Special!* (http://www.phase2motortrend.com/babeoilretsi.html) so that means i need an adapter for the block so i can bolt on the rest right?

right that one looks like mine so you would need the block adapter.


thanks sileighty_85 and fliprayzin240sx...taka motorsport restrictor on the way....

Could NOT having this restrictor cause some oil burning ???

Yes, overpressurizing the CHRA will cause the oil seals to fail.

But when oil burns its blue, white is coolant, I would do a compression test and a leak down test just to make sure your head is seated correctly.

[Nissan_Power]

Compression is good, was the same before I changed the head gasket. I used a Cosworth gasket.

The smoke is white with a blue tint, smells like oil, not that weird sweet prestone smell. Turbo elbow is dry dry dry, intake piping too...starts perfect, runs idle perfect but sometime you can hear a little putt-putt coming from the exhaust while the engine idles. Does not heat, plugs arent white, they're dark brown, im running too rich i know...

only thing i can see is that the machine shop fucked up one of the valve seals (new ones ). I also had the valve guides replaced...

[TheWolf]

I highly doubt a machine shop screwed up a valve stem seal. That's like a chef at a 4 star restaurant screwing up a PB&J. Why did you go into the head in the first place? You say that it will emit smoke from idle to 2000 RPM constantly? Had the machine shop recut the seats for the new guides? Is the turbo new?

[fliprayzin240sx]

You could be running rich as heck...

[Nissan_Power]

You could be running rich as heck...


I know im running rich as heck, plugs get dark VERY fast and I installed an adjustable fuel pressure regulator (nismo) . Wouldnt the smoke be a lot darker ???

Turbo is brand new in the box, along with 740cc Nismo injectors...I didnt dyno-tune the car yet.

I went in the head in the first place to change the head gasket...I didnt trust the Cometic one that was there ! I had the full gasket set from Nissan, so I sent my head to be cleaned, checked, they replaced the valve seals and valve guides too

[GSXRJJordan]

I saw a bubble flare looking thing with a tiny hole in the oil inlet of the turbo. It was the size of the ball in a bic pen.

And another thing, i cant put a restrictor on the block, a banjo fitting hooks up the lines at the block.

I was told by a sales-person from the company i bought the turbo from that I dont need a restrictor for my gt2871r because they sold me -3 braided lines and that they only put restrictors on -4 lines....sounds like bull**it to me, sounds like they sold me useless lines...

What do you think, makes any sense to you guys ???

Most people don't run restrictors with -3an lines... there's just not enough oil passing through to hurt anything. I made sure to run a restrictor with my S15 T28, but do not run a restrictor on my current -3an line to my RB25 T3.

That being said, the "correct" (read: most used) size for dual-BB turbos is .032". Journal bearing usually uses .064".

I just bought a .03" for my s15 spec r turbo, is that the right size? Sorry to thread jack, and to install it i would bolt this into the turbo itself right? I have aftermaket lines so i would just unbolt the oil feed and bolt the restrictor in there? thanks.

Yup, that's the right size. You're good.

[Nissan_Power]

I highly doubt a machine shop screwed up a valve stem seal. That's like a chef at a 4 star restaurant screwing up a PB&J. Why did you go into the head in the first place? You say that it will emit smoke from idle to 2000 RPM constantly? Had the machine shop recut the seats for the new guides? Is the turbo new?

Turbo is brand new, and yes the machine shop recut the valve seats...

[rs4buddy]

Can anyone else vouch for not using a restrictor on circuit sports -3an lines?? Iam in the same debate with installing my gt2871 .64

[Nissan_Power]

I'm not taking any chances, I'll install one as soon as I receive it from Taka Motorsport!....Takes a while to be shipped to Quebec :(

[s14unimog]

Can anyone else vouch for not using a restrictor on circuit sports -3an lines?? Iam in the same debate with installing my gt2871 .64

Don't do that...GSXR said the word. Use a 0.032" for BB turbo's and 0.063" for Journal, regardless of the line.

[GSXRJJordan]

Can anyone else vouch for not using a restrictor on circuit sports -3an lines?? Iam in the same debate with installing my gt2871 .64

For a large journal-bearing turbo, you'd probably be fine with -3an lines and no restrictor... for your tiny ass ball-bearing turbo, you NEED a ~.030" restrictor or you'll blow those CHRA seals and be out $700.