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Old 10-13-2009, 12:25 PM   #101
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Originally Posted by Garretttttttt
Ball Bearing Turbo

Ball Bearing Turbo An oil restrictor is recommended for optimal performance with ball bearing turbochargers. Oil pressure of 40 - 45 psi at maximum engine speed is recommended to prevent damage to the turbocharger’s internals. In order to achieve this pressure, a restrictor with a 0.040' orifice will normally suffice, but you should always verify the oil pressure entering the turbo after the restrictor in insure that the components are functioning properly.
Recommended oil feed is -3AN or -4AN line or hose/tubing with a similar ID. As always, use an oil filter that meets or exceeds the OEM specifications.
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Old 10-13-2009, 12:42 PM   #102
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You want that restrictor, over oiling a bb turbo will kill it. It has much tighter clearances, and does not use oil flow to cool the center section as much as the water does. This is somewhat in converse to a journal turbo where it needs higher flow to maintain an oil film and oil is used to cool everything.
I looked into this earlier this year, and even talked to a few profs that gave me some good reading material. I was tired of people saying journal bearing turbos needed a restrictor.

I found that over-oiling will turn ball bearings from a rolling element bearing to a sliding element (ala journal bearing)...which is bad. If the ball bearings stop "rolling" between their two contact surfaces you're in trouble. The low contact area makes a very poor journal bearing, and they start to wear quickly...regardless of abundant oil supply. It's really a matter of surface pressure really...same forces as in a journal bearing...but much smaller area. Follow the Garrett advice Braineack posted and you should be fine.

Journal bearings on the other hand have a minimum pressure which is significant...and luckily often pretty low by design. Once you achieve this minimum pressure there are no other concerns with regard to the bearings. The only reason to put a restrictor in a journal bearing turbo is to prevent blowing oil out of the seals.
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Old 10-13-2009, 01:26 PM   #103
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Are you sure? I talked this over with both BEGI and ATP Turbo and they both think a restrictor was not needed on my GT2871 (ball bearing).
min liked to puke smoke on cold start before it died.
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Old 10-13-2009, 01:40 PM   #104
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I guess I'll call BEGi and have them make a smaller one because I went with a .060 previously. How small should I go on a track car?
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Old 10-13-2009, 01:43 PM   #105
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Go with what 0.040" like Garret recommends or a 0.035" like other people have used. It really has nothing to do with if you track your car or not. It has to do solely with oil pressure.
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Old 10-13-2009, 02:01 PM   #106
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It's your turbo, do what you want. I don't type **** just to exercise my fingers.
Neither do I.
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Old 10-13-2009, 02:03 PM   #107
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I guess I'll call BEGi and have them make a smaller one because I went with a .060 previously. How small should I go on a track car?
this small:

'Oil pressure of 40 - 45 psi at maximum engine speed is recommended to prevent damage to the turbochargerís internals.'
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Old 10-13-2009, 02:24 PM   #108
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I've been running .035 restrictors for 30k miles on two (three?) different BB turbos. I've never seen a single drop of oil in my charge pipes.

Trey, it might be that heat shield that's getting the EWG hot. I wouldn't worry about it.
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Old 10-13-2009, 02:29 PM   #109
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Trey, it might be that heat shield that's getting the EWG hot. I wouldn't worry about it.
I don't know that he possesses the ability to not worry about it. Wishful thinking though.
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Old 10-13-2009, 02:36 PM   #110
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I've been running .035 restrictors for 30k miles on two (three?) different BB turbos. I've never seen a single drop of oil in my charge pipes.

Trey, it might be that heat shield that's getting the EWG hot. I wouldn't worry about it.
I have no heat shield on it. Thanks for the heads-up on the restrictor.

I just shipped everything out so hopefully I'll have this car back on the street next weekend...there went my brake money.
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Old 10-13-2009, 02:38 PM   #111
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there went my brake money.
How dare you disrespect blahhhh blahhh blahhhhhh.
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Old 10-13-2009, 02:40 PM   #112
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I don't know that he possesses the ability to not worry about it. Wishful thinking though.
I'm getting better and starting to trust the car after another successful track day.
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Old 10-13-2009, 02:41 PM   #113
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You won't "kill" a Garrett bb turbo by delivering high oil pressure to it. What this will do is force oil past the seals, which will then find a new home in your IC pipes and/or make for a smokey exhaust.

Once you fit a proper oil inlet restrictor, the smoke gradually goes away, the valdez in the plumbing clears up and all is well.

Oh, also, high oil pressure can nullify a bb's low-friction-ness by introducing a bunch of windage. But you won't hurt the bearing. Oil pressure that's too low, sure, that'll kill it.
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Old 10-13-2009, 02:45 PM   #114
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Originally Posted by hustler View Post
I'm getting better and starting to trust the car after another successful track day.

remember all those posts about having the most reliable track car ever built?
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Old 10-13-2009, 02:46 PM   #115
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I run that ATP restrictor too. Turbo wants it.
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Old 10-13-2009, 02:53 PM   #116
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Well then **** me. More misinformation from two sources, including ATP. Maybe I should get a restrictor as well, or call ATP and ask WTF?
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Old 10-13-2009, 02:57 PM   #117
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Originally Posted by ZX-Tex View Post
Well then **** me. More misinformation from two sources, including ATP. Maybe I should get a restrictor as well, or call ATP and ask WTF?

Listen to Jkav, he's a turbu guru from Garrett.
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Old 10-13-2009, 03:19 PM   #118
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remember all those posts about having the most reliable track car ever built?
I've learned a lot in my desire to have the most reliable turbo miata, and fallen victim to [insert signature here].

I guess I'll try the .035
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Old 10-13-2009, 03:38 PM   #119
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hustler, I may have missed it but if you not seeing signs of oil getting past the turbo's seals then you're fine with the restrictor size you have.

EDIT: just saw that it smokes on startup. Hmm. I don't know if this is related to the turbo--oil pressure on a cold start isn't that high (relatively speaking) and cold oil is viscous and has a harder time working past the turbine seal.
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Old 10-13-2009, 03:48 PM   #120
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Quote:
Originally Posted by Braineack View Post
Listen to Jkav, he's a turbu guru from Garrett.
That and Garrett site itself says run 40psi or .0035 restrictor with bb.
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