Oil restrictor on BT turbos

[ericpaulyoung]

How many if you using ball bearing turbos also use an oil restrictor?
Eric

[Charles.waite]

I'm under the impression you always need one. But I'm no expert.

[ericpaulyoung]

That is what I am trying to determine. Garrett says the proper pressure is 40 psi at the turbo, and from what I can gather our cars produce around 60 psi full tilt. I would rather have a little too much oil rather then too little though.
Eric

[marklar182]

BB turbos absolutely need a restrictor. Normally .035"-.040"

[ericpaulyoung]

Anybody out there run a BB without a restrictor on our cars? Searching online the opinions range from required to optional, so I would love to hear from anyone that has actual experience on our platform.

Eric

[viziers]

Do not run the turbo without one or it will be a short lived turbo..... Too much pressure and you will blow out the bearings.....




vizi

[DRAKLORE]

Where does it go, on the feed line I the pan, or at the turbo?
Not sure if I have one or not. I've seen tis discussion before. And iirc someone (presumably an expert) came in and said something to the affect that on our cars it's either already there in some application. Or not needed..
Whatever was said it was enough for me not o worry or care

[ericpaulyoung]

It goes right on the turbo. The reason I ask is because I am thinking of running without it. Here is a picture of the little guy.

http://www.atpturbo.com/mm5/merchant...gory_Code=GTBB

[boostin20v]

Do not run the turbo without one or it will be a short lived turbo..... Too much pressure and you will blow out the bearings.....

this

[DRAKLORE]

I'll check I'm assuming its installed

[mec]

my kit didn't come with one either but I am definitely planning on getting one.

[ericpaulyoung]

my kit didn't come with one either but I am definitely planning on getting one.

My kit came with it, but I drilled it out. It didn't make sense to me to have a -4AN line for high flow, then put a tiny hole on the end of it. From what I read so far, it looks like it is definitely not a sure thing, and Garrett even says that it is not necessary, but recommended. Here is what the Garrett site states for their BB turbos.

"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. "

"OIL LEAKAGE SHOULD NOT OCCUR ON A PROPERLY FUNCTIONING SYSTEM IF RESTRICTOR IS NOT USED UNLESS THE SYSTEM PRESSURE IS EXCESSIVELY HIGH. ""

[ericpaulyoung]

here is the site

http://www.turbobygarrett.com/turbob...il_water_lines

[ericpaulyoung]

And here is another part of the Garrett site that is making me wonder.

"Garrett distributors can tell you the recommended range of acceptable oil pressures for your particular turbo. Restrictor size will always depend on how much oil pressure your engine is generating-there is no single restrictor size suited for all engines. Ball-bearing turbochargers can benefit from the addition of an oil restrictor, as most engines deliver more pressure than a ball bearing turbo requires. The benefit is seen in improved boost response due to less windage of oil in the bearing. In addition, lower oil flow further reduces the risk of oil leakage compared to journal-bearing turbochargers. Oil pressure entering a ball-bearing turbocharger needs to be between 40 psi and 45 psi at the maximum engine operating speed. For many common passenger vehicle engines, this generally translates into a restrictor with a minimum of 0.040" diameter orifice upstream of the oil inlet on the turbocharger center section. Again, it is imperative that the restrictor be sized according to the oil pressure characteristics of the engine to which the turbo is attached. Always verify that the appropriate oil pressure is reaching the turbo. The use of an oil restrictor can (but not always) help ensure that you have the proper oil flow/pressure entering the turbocharger, as well as extract the maximum performance."

[Dan[FN]6262]

.032" is what Garrett typically sends out with BB CHRAs.

[fordyoz]

just get an EFR

[Dan[FN]6262]

boom.

[ericpaulyoung]

Does the EFR have a built in restrictor? Or just not need one?
- Eric

[ericpaulyoung]

I just got an email from ATP turbo, they said that the VAG kits come with a restrictor, but it is optional and you can run unrestricted without any problems.

Here is their email.

"Eric,

The VAG kits come standard with an oil restrictor.

You're welcome to run an unrestricted fitting instead if you like.

It would not hurt anything.

Thank you."

- Eric

[fordyoz]

Does the EFR have a built in restrictor? Or just not need one?
- Eric

page ~37 and ~74
http://www.turbodriven.com/files/pdf...ical_brief.pdf

[Charles.waite]

I thought our cars were closer to 80 psi oil pressure at full bore?

[rubberband]

You need a restrictor. Just call ATP or 034. They will recommend the right one for our motors.
Without one,too much pressure and seals will blow quickly.

[ericpaulyoung]

My plan was to remove the restrictor and add an inline filter, but it looks like the only way to do it right is going to require adding an oil pressure tap at the turbo to see what it is actually seeing pressure wise.

So what is our pressure at WOT? anybody have a pressure gauge on their car?
Eric

[fordyoz]

My plan was to remove the restrictor and add an inline filter, but it looks like the only way to do it right is going to require adding an oil pressure tap at the turbo to see what it is actually seeing pressure wise.

So what is our pressure at WOT? anybody have a pressure gauge on their car?
Eric

give the red dragon a little more juice?

[ericpaulyoung]

^^Awesome

[CorneliusRox]

^^Awesome

x2

[Dan[FN]6262]

run a restrictor.

[ericpaulyoung]

Ordered one up.
Eric