GT2859R Turbos

[proline]

Can anyone confirm the size of the internal oil restrictor in the Garrett 836026-5002S turbocharger (GT2859R) - These are the upgraded versions with ceramic bearings.

Or

Whether anyone needed to use a HKS 0.8mm (or other) oil restrictor with this particular model of GT2859R

Thanks

Lee

 

[TXSquirrel]

I don't know the size of oil restrictor built in, but I have those same turbos for almost 5 years now without another secondary oil restrictor, so far all is still good. 

[proline]

Thanks for the reply - much appreciated.

Just to confirm that you are talking about the Garrett 836026-5002S turbos with the ceramic bearings?

Out of interest why did you not fit the HKS 0.8mm restrictor?

[r32-25t]

Because you don’t need it

[TXSquirrel]

That's what the label on the box showed, unless GCG sent me something different inside.

I had a shop doing the installation, and they told me I didn't need it.  Not sure if it's a good idea to add a restrictor on top of another anyway, that may reduce or slow the oil flow too much.

Edited April 20, 2022 by TXSquirrel

[proline]

Thanks again for the reply - really helpful.

I assume you're not experiencing any unexplained lag or smoke from the exhaust?

Are you using a high pressure oil pump?

How much boost are you running?

 

 

 

[TXSquirrel]

I don't think what you are questioning have any relation to the oil situation around the restrictor.

No, I have no issue for the past 5 years, lag, smoke, etc.  I do feel the -9s are still laggier than I expected, even with the Tomei cams I have that come with very different centerline than factory cams.

I have stock oil pump.  A high pressure oil pump will not impact the oil restrictor.

Mine is dyno tuned to 20psi, but I only run 15psi most of the time.

[proline]

The questions I asked are I think relevant to the oil restrictor because it seems people that tend to have problems with Garrett turbos:

a) experience more lag and/or smoke because of over oiling

b) run high pressure pumps

c) run high boost which is probably why they have the high pressure oil pump.

One theory is the high pressure pumps over power the in-built 1.0mm restrictors causing a) above and so require the HKS 0.8mm restrictors.

Anyway thanks very much for all your replies - you have really helped me make up my mind not to use secondary restrictors.

[BK]

On 22/04/2022 at 11:11 PM, TXSquirrel said:

 the -9s are still laggier than I expected, even with the Tomei cams I have that come with very different centerline than factory cams.

Put your factory cams back in. Just gonna be laggier with those Tomei lumps.

[BK]

On 23/04/2022 at 6:33 AM, proline said:

The questions I asked are I think relevant to the oil restrictor because it seems people that tend to have problems with Garrett turbos:

a) experience more lag and/or smoke because of over oiling

b) run high pressure pumps

c) run high boost which is probably why they have the high pressure oil pump.

One theory is the high pressure pumps over power the in-built 1.0mm restrictors causing a) above and so require the HKS 0.8mm restrictors.

Anyway thanks very much for all your replies - you have really helped me make up my mind not to use secondary restrictors.

The difference in restrictions you're talking about is negligible on a turbo oil feed.

I run the original HKS GT-SS which are metal ball bearing -9 equivalent. They came with restricted banjo bolt from memory, not an actual restrictor in the turbo. There was nothing in the turbo chra to limit oil flow.

The newer -9 sounds like the oil restrictor feed is in the chra for exactly the reason of not needing any restrictors in the fittings or line, so you can't stuff it up.

[joshuaho96]

On 4/22/2022 at 6:41 AM, TXSquirrel said:

I don't think what you are questioning have any relation to the oil situation around the restrictor.

No, I have no issue for the past 5 years, lag, smoke, etc.  I do feel the -9s are still laggier than I expected, even with the Tomei cams I have that come with very different centerline than factory cams.

I have stock oil pump.  A high pressure oil pump will not impact the oil restrictor.

Mine is dyno tuned to 20psi, but I only run 15psi most of the time.

Doesn't the turbo call for a specific oil pressure at the feed? So in theory at least a super high pressure oil pump will need more restriction and a low pressure oil pump would need less restriction. How much that actually matters in the context of real parts I don't know.

[BK]

Not oil pressure- oil volume. As long as it's not the volume requirement for a journal bearing turbo as they require far less oil volume on a ball bearing cartridge.

Read what I posted. The turbos oil volume is regulated by the restriction too. On my HKS GT-SS it was to use a different supplied banjo bolt as the restriction, as in say remove the standard banjo with a 5mm odd hole (stock journal bearing heap of shit) vs one with a smaller (1mm or so) hole for a ball bearing cartridge.

If the new -9 are restricted as implied at the chra to the correct size it doesn't matter what oil feed bolt you use as long as it's bigger than the chra oil feed restriction fitting. I've noticed Precision doing exactly this on their ball bearing cartridges to stop muppets getting the oil feed sizing wrong - just use a -4 line to oil turbo feed and it will be correct as the chra fitting has been restricted for you correctly.

[TXSquirrel]

Exactly, it's not a higher pressure oil pump, it's a higher volume oil pump.

[joshuaho96]

I checked online and Garrett seems to suggest that at warm idle minimum oil pressure at the inlet needs to be at least 15 psi and at redline no more than 45 psi. Can you really separate oil pressure and flow rate in these systems? I assume that when the spec says a certain oil pressure it implies a certain resulting pressure drop across the CHRA and a resulting flow rate.