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Hi Folks,

Interested in knowing if you HKS/Garrett GT30xx owners use an oil restrictor on your oil feed to your turbo ??

Like this (or simlar banjo attachment)

gtoilinlet035-01.jpg

Reason I ask is that I am getting different info from various sources.

I am inclinded to think yes -

But putting restrictor on when not neccessary might be a BIG problem if caused oil starvation to the centre core.

Cheers,

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I just went thru all this shit,I'd say yes to a restrictor,I don't know what size but all ball bearing turbos I know are restricted coz to much oil and they don't spool good and can piss oil thru seals.

I'm fairly sure it's a -4., 0.9mm hole (o.o35)

But need feedback from people who have done this and gone the distance with the restrictor in - not just daily driving - circuit and track work..

Cheers,

:P

In my skewed, often wrong opinion...

Double ball bearing turbos don't rely on oil pressure to support loads, and (GT series) have water cooling to cool the cartridge. So a high pressure/volume of oil isn't as vital - hence why I use a restrictor.

Edit: I think this applies to all HKS ball bearing turbos, and Garrett GT as well.

More info for you guys - I have an N1 oil pump - so more oil flow to the turbo.

I am getting puffs white smoke from the exhaust on decelaration from redline in 4th and 5th gears whilst the engine is in gear.

I have rung two Turbo specialists and both told me I didn't need one - but I'm not sure if they understood my circumstances.

Cheers,

Im also running an N1 pump on my car and have no issues with leakage?

http://www.gcg.com.au/technical/garrett%20...ng%20chra's.jpg

If you look at the top left corner of that sheet it has a little cutsection of a GT CHRA, you can see the very little oil passages, it needs heaps of pressure in the chamber above the nozzle to create an oil "spray" over the bearings, i dont believe with a restrictor you will have the same pressure in that chamber.

Id strongly suggest not putting a restrictor on these turbos.

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