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Turbo Oil Restrictor

sav man

By sav man,
in Engines & Forced Induction

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sav man Grand Master

sav man

Posted
Posted

I just got a pair of HKS GT2530's rebuilt with Garrett parts. I know that HKS put the oil restrictors in from the factory, but i've read that Garrett don't.

I ordered a HKS GTRS gasket kit from nengun, and that came with a oil restrictor. Sould I use it?

Thanks

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post-5985-1162638281.jpg

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
I just got a pair of HKS GT2530's rebuilt with Garrett parts. I know that HKS put the oil restrictors in from the factory, but i've read that Garrett don't.

Garrett do, any Ball Bearing turbo correctly built/assembled will have an internal restrictor on the cartridge itself.

You cant see that till you pull it apart though. The pics you have an external ones.

I know the Garrett GT30XX series was a .8mm (if memory serves me correct) :(

And that was 2 years ago when i had it, so Garrett were doing it back then for sure.

Being Garrett make the HKS turbos aswell, i dont believe you have an issue.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

They dont actually "put" them in.

If you saw the inside of the cartridge you would know what i mean, its on the actual bearing housing itself... so its like that from the production line.

Im sure MTQ will be able to explain in better english :(

turbo87 Enthusiast

turbo87

Posted
Posted

I have heard with GT3540's some people have been having trouble with leaking turbo seals due to the high oil pressure run by some high performance engines, Garrett supply another oil restrictor smaller than the inbuilt one if people have trouble, not sure if you would need one or where to find them

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

No, as i said... There is a restrictor on the cartidge.

There is only going to be "X" amount going in there whether you run 50 restrictors or one before you get to the cart itself.

If you fit a larger restrictor before the restrictor on the cartridge, then obviously it will slow the oil/volume down to the core, but once it reaches the core its only going to let in what the internal one dictates anyhow so to my limited understanding of fluid dynamics, it makes no difference.

Contact MTQ and see what they say, but i never ran anything more than the internal restrictor for my GT30 and i had an N1 pump etc.

I could name a dozen others who have done the same with thier setups, not one has blown a seal or had adverse effects.

If the twin setup is different, i would like to know why :)

discopotato03 Grand Master

discopotato03

Posted
Posted

If you look at your second picture you can see the restrictor in the oil inlet hole . Its the hollow mushroom shaped gadget that needs an inverted flare fitting . All these GT25 BB centre sections have them , actually its the stem of the restrictor that does fore and aft location of the bearing pack itself . If its not there the turbine and compressor try to shunt backwards and forwards depending on which side has the greatest thrust load at the time driving its opposite wheel into its housing - not good .

I guess two restrictors can't hurt but I'd rather have the one only in the turbo because it has unrestricted flow to within a couple of cm of the bearings .

Cheers A .

  • 2 weeks later...
r33_racer Grand Master

r33_racer

Posted
Posted (edited)

well up here in qld there have been a few people blowing seals out at the track...gt30s and 35s alike. Alot of people are now starting to run an inline restrictor that sits right before the cartridge one. I think its about 40psi of oil pressure is the max required for the turbo. Does that sound right disco?

Edited by r33_racer
sav man Grand Master

sav man

Posted
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Posted

I still havn't got round to contacting MTQ. been to busy doing other stuff on the car to worry about putting the turbo's on yet. I'll post MTQ's responce when I get round to ringing them.

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