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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 12-01-2009, 08:27 PM   #1
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Default oil restrictor or not?

So I'm about to plumb my HY35 holset for oil feed and am wondering if it should have a restrictor or not? I don't know what the oil presure of the dodge diesel trucks tipicaly is, if you have any insight please let me know thanks!
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Old 12-01-2009, 08:29 PM   #2
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If its journal bearing I don't think it needs a restrictor. I'm pretty sure its not ball bearing.
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Old 12-01-2009, 10:16 PM   #3
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No I dont think Holset makes a ball bearing turbo. I do think the Cummins has less than 60psi of oil pressure and that is what is making me wonder.
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Old 12-01-2009, 10:26 PM   #4
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If all else fails you can lurk on the Dodge sites and find out.
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Old 12-01-2009, 10:46 PM   #5
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No restrictor for the holset (journal bearing).
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Old 12-01-2009, 10:53 PM   #6
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cool thanks guys I dont want to have any more problems, I already found that the turbine housing was cracked by the internal waste gate hole, but im welding that shut so I hope it wont be a problem.
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Old 12-01-2009, 10:55 PM   #7
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Every other Subaru STi turbo gets a crack like that past 40k miles jfyi. It is never a problem. Don't think you'll have any problems.

Make sure to weld it PROPERLY though. There's a process to welding cast steel like that. If you do it wrong it will hold for all of a few days.
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Old 12-01-2009, 11:05 PM   #8
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Ive weled cast before no problems. Hows the new motor running?
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Old 12-01-2009, 11:06 PM   #9
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So far so good
Exhaust leak is buggin the hell out of me but I'll get that sorted out soon
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Old 12-01-2009, 11:08 PM   #10
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Nice, get that fixed and we'll have to meet up some time.
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Old 12-02-2009, 06:51 PM   #11
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If you don't want to put a restrictor in a journal bearing holset then why do we do it to our Garrett turbo's?
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Old 12-06-2009, 01:18 AM   #12
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Assuming the turbo goes on a Miata engine, you MUST use a restrictor.

What dictates restrictor or not is what pressure is going to be feeded to it, not where it came from.

The Greddy kits have it included, like I learned the other day, so there is no need as it would be redundant.
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