Garrett /HKS GT30 owners - do you use an oil restrictor ?

[B-Man]

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)

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,

[R31 POWER]

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.

[B-Man]

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,

[R31Nismoid]

i dont have one, and i dunno anyone else that has either :confused:

mind you i aint finished my project but it's at least running

[DoughBoy]

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.

[Craved]

i'll be putting my HKS GT30 on soon so i'll be interested in any info as well!! hey B-Man you in the sydney area, would love to check out your setup for ideas on this turbo!

[B-Man]

Yeah Chris I'm in the Sydney - out and about at lots SAU events - WSID, EC, Oran, etc

Thanks for the feedback peeps - keep it coming.

[rb20-calais]

(sorry for hijack)

Chris,

Did my turbo have a restrictor?

Evan

BTW. I LIKE IT!

[JasonO]

Hmmm, I seem to recall that my HKS GT3037 has a restirctor actually in the oilway, rather than a bolt in restrictor like in your picture above.....

I will double check in the morning, as it's still in it's box in the corner of the workshop.

[YRL05S]

I brought a GT35/40 on the weekend from V&E Rigoli, same as used on the CRZYFJ Gemini (ran a 8.92), it runs a restrictor, so i will be running one.

[B-Man]

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,

[B-Man]

Rhys = that is a big F.Off turbo for your SR mate - that's serious ! !

[YRL05S]

Rhys = that is a big F.Off turbo for your SR mate - that's serious ! !

Hopefully it will chirp 2nds now

[raist60]

Garret GT series CHRA's have very small nozzles right above the actual bearings. I wouldnt restrict it. Thats what the nozzles above the bearings are for.

[B-Man]

CHRA ????

[poyz]

CHRA = Center Housing Rotating Assembly

[B-Man]

[JasonO]

Every now and again I get it right :headspin:

[B-Man]

Merli, Steve ? What about you guys ???

[raist60]

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.