Long story short, i will be running a t04s on a 13b-re, do i need some sort of oil restriction in the oil feed or return line to/from the turbo? if so where can i get one?

-Jacob

 

Generally speaking, unless you are running a GTBB turbo you do not need a restrictor. So say the manufacturers. In practice, I ran a restrictor, about an 1/8" on the inlet to my Garrett TO4S, and a full sized return. This seems to work well. In addition, I believe the XS turbos benefit from a restrictor. All that said, Turbonetics, and Garrett recomend against them. My TO4S had ~15000 miles on it, with no problems when I pulled it in favor of a T66. Hows that for a whole lot of yes, and no Carl

 

http://www.atpturbo.com/Merchant2/me...egory_Code=OIL

This might be what you're looking for.

 

The Hks t51, I got, which is made by garrett, came with aluminium flange on the inlet that was also a restrictor, it was drilled just under 1/8 th inch, the flange has garrett cast into it BTW...Max

 

I have the same flange max has, it was being used on an old school Garrett journal bearing TO4S turbo. DO NOT use the "GT" restrictors which are intended for B turbos, if you have a Garrettturbo that is journal bearing, the restrictor is ~1/8", if you have a Turbonetics, they say use no restrictor. The XS turbos were probably Garrett based, thus the problems for people not using a restrictor(someone should confirm that).

 

Hmm, so using the restrictor is dependent upon the manufacturer? My turbo was built by cheapturbo.com, not sure which parts they use

-Jacob

 

I don't have a direct answer for you, but I have a couple thoughts based on my research and limited experience in this area.

-I bought a Blowzilla from Ken at cheapturbo and he suggested a -3 or 4an feed with a 10an return without a restrictor.

-I have put about 1,000 miles on my turbo with a -3 feed and a -12 return. My friend is using the same setup with a T04E also purchased from Ken at Cheapturbo. Neither one of us have had any observable problems with the oil seals.

-One of the techs I spoke to at Magestic turbo said that the most important thing is for the return line to be a gravity feed-meaning no restriction. Demetrios also said the ratio between the feed and return is the critical factor.

-What oil pressure did they use to determine the restrictor size? I believe the FD has different oil pressure than most piston cars. If this is true I don't think you should rely on Garrett's restrictor recommendation without compensating for the different in pressure.

 

I believe most of Cheap turbo's pieces are Garrett, with the 1/8" restrictor on my street port FC I was using a -10 return, ran like a champ. So, who made your turbo? call them and ask, end of story...

 

yeah the retun line is very important, in size, in the T4 garrett blueprints, they show the oil connections have to be wihin so many degrees of plumb to work properly, I think its 30 degs..Interesting some diesel gensets I have worked on have T04b turbos, with the drain actually travelling uphill back to the block, I check it twice, I didn't beleive it at first..
I am gonna play with oil pressure on my car to see what happens, I can adjust it up to 140 lbs, not sure if thats gonna be neccesary, but I may try it... The car was idling yesterday with 75 psi oil pressure and no smoke from turbo...Max

 

Really. I used that ATP on my turbonetics T04B for around 2000km. I took it off since I was not boosting right. It made no difference in response or smoking.

Do you think this would hurt the turbo to use this restrictors.

 

I was surprised when I saw this to. The truck turbo's similiar to our T04b's actually have an incline to the oil return line. This would lead me to believe that having a staight oil return line and a 90° bend should in no way harm the turbo.

 

I think part of it to, is the diesels having pretty much nil intake vacuum, would tend not to suck in any oil, and perhaps being on boost pretty much all the time keeps the seal loaded enough not to allow oil to get by on the exhaust side, with the gensets, they are boost from the split second they start..
Off on a tangent bu I watched a video the other day of some guys car with a ball bearing turbo (GT) in it, he shuts off the car , comes back like minutes later , and the turbos still spinning pretty fast, all in all that can't be to good, that turbo spun for a long time with no lube being fed to it... The ball bearing guys might want to consider an idle down oil accumulator for those things...Be interesting to see how long those things last..max

 

I asked T'Netics directly, and they said DO NOT USE A RESTRICTOR. The answer to your question I do not know, but a BB turbo requires/wants far less oil than a journal bearing.
Max, I don't think the BB turbos need much oil, I doubt that they are being damaged by a long spin down. If they are spinning freely that would tend to indicate that they are sufficiently lubricated in my mind, a relatively small one, I admit .