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Turbo Oil Restrictors

33SOM

By 33SOM,
in Engines & Forced Induction

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XGTRX Veteran

XGTRX

Posted
Posted (edited)

Just went through similar shit, but a single. If you are using the stock oil feed lines on yhe twins, as far as I know, they have restrictors on the banjo fitting on the block, BUT you have to check ur oil pressure and make sure its not too much more than stock. I think on the tomei pump you can adjust the oil pressure if its too high.

Edited by XGTRX
scotty nm35 Grand Master

scotty nm35

Posted
Posted

Quite often I have had to use multiple 1mm restrictors on single setups, it's common to overfeed the bearings/journals with oil and force it out the seals, especially if the drain is compromised. Grab some 34 restrictors and try them, as the 32 doesn't run them i'm pretty sure, but understand journal turbo's need a lot more oil supply than BB cores, you might have to drill the restrictors out a bit if they are journal bearing cores.

If you can lower the pressure externally as XGTRX mentioned it might be a lot easier than mucking around with the feed to the turbos.

GTRPSI Mentor

GTRPSI

Posted
Posted

Set your oil pressure Via the Tomie pump according to your bearing clearances, oil weight and RPM limit for the engine internals to survive.

Then sort out your turbo oil feed restrictor.

Pointless lowering your oil pressure to suit your turbo feed if your running big bearing clearances and intend to rev to 9000......engine will just eat itself out internally if the engines oil pressure is not there at higher RPM's

The turbo oil feed rate is adjusted after you have sorted your engines working oil pressure.

  • Like 1
mr skidz Veteran

mr skidz

Posted
Posted (edited)

I'm looking to restrict my factory oil lines to my bb turbos I heard the factory 1.2 millimetre is reduced to point eight millimetre with High volume oil pumps?

Does Earls or someone sell banjo bolts with smaller orifices.

Edited by mr skidz
mr skidz Veteran

mr skidz

Posted
Posted

Ive silver soldered the inside of the fitting then drilled it out to desired size . Bit less dodgy then gluing.

definitely that's the go f**k glue, was just hoping to change a Bolt and be done.

I'm surprised there's nobody selling these things as I'm sure I'm not the first person to put ball bearing turbos on an RB with a big oil pump.

  • 5 weeks later...
mr skidz Veteran

mr skidz

Posted
Posted (edited)

Absolutely, Just want to know whether nissan chose to restrict oil flow at the block via banjo on the 34's while garrett obviously fit them on the cartridge to be sure there restricted for warranty purposes.

The difference being 1x .8mm banjo restrictor at the block vs 2x .8mm restrictors at turbo cartridges.

Just wondering under pressure if both examples/ Turbo's would see identical oil flow being dictated by the smaller .8mm oriface @ the block.

For a high volume pump setup

Edited by mr skidz

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