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Oil restrictors for PTE 6766's?

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Oil restrictors for PTE 6766's?
Old April 28th, 2015, 10:54 AM   #1
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Oil restrictors for PTE 6766's?

Just picked up a pair of Precision billet 6766's (.96 T4 exhaust) with journal bearings and was wondering what people were running for oil inlet restrictors, if any..

I'm running a single EXA return pump.

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Old April 28th, 2015, 10:55 AM   #2
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I want to say on my Precision turbos, NOS pills were used as restrictors.
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Old April 28th, 2015, 11:28 AM   #3
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You don't use restrictors on Journal bearing turbos.
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Old April 28th, 2015, 11:55 AM   #4
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Quote:
Originally Posted by Will at RSI View Post
You don't use restrictors on Journal bearing turbos.
So I'm guessing you've never had an issue with oil making it past the seals using only 1 scavenge pump? Good to know.
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Old April 28th, 2015, 11:55 AM   #5
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Quote:
Originally Posted by 99RT10>S View Post
I want to say on my Precision turbos, NOS pills were used as restrictors.
Were they ball bearing or journal?
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Old April 28th, 2015, 12:05 PM   #6
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Quote:
Originally Posted by AndyMac View Post
So I'm guessing you've never had an issue with oil making it past the seals using only 1 scavenge pump? Good to know.
If the scavenge pump system is setup correctly, you will have very little oil that makes it past the turbo seals. Generally when we see people complaining that they have oiling issues, it is from oil that has accumulated in the turbo after the engine has been shut off. If you ever fail to run the pump and start the car, you will certainly push about a quart of oil into both the compressor and turbine sides of your system in a matter of seconds.
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Old April 28th, 2015, 01:25 PM   #7
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Would it help if the scavenging pump ran for a few seconds after the engine turns off?
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Old April 28th, 2015, 01:57 PM   #8
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Quote:
Originally Posted by tspargo View Post
Would it help if the scavenging pump ran for a few seconds after the engine turns off?
I had oil blowby issues on my turbos. I did the following and it finally quit:

Check valve on feed lines near the block.
Check valve on return line near the oil pan.
Scavenge tanks under each turbo.
And I did what you said, I built a timing circuit that keeps the scavenge pump running 30 seconds or so after the car has shut off.

Due to wastegate placement I do have my scavenge pump mounted behind the front bumper, so I've got a significant amount more oil in my return lines than other people do.
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Old April 28th, 2015, 02:17 PM   #9
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do not use oil restrictor on PTE journals.. call PTE and ask them what feed size to use.
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Old April 28th, 2015, 02:47 PM   #10
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Quote:
Originally Posted by sassafras View Post
I had oil blowby issues on my turbos. I did the following and it finally quit:

Check valve on feed lines near the block.
Check valve on return line near the oil pan.
Scavenge tanks under each turbo.
And I did what you said, I built a timing circuit that keeps the scavenge pump running 30 seconds or so after the car has shut off.

Due to wastegate placement I do have my scavenge pump mounted behind the front bumper, so I've got a significant amount more oil in my return lines than other people do.
Is this a custom, DIY turbo kit install?
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Old April 28th, 2015, 02:59 PM   #11
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Quote:
Originally Posted by tspargo View Post
Is this a custom, DIY turbo kit install?
You're scaring me man.
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Old April 28th, 2015, 03:00 PM   #12
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Quote:
Originally Posted by AndyMac View Post
Were they ball bearing or journal?
Journal. My tuner didn't think they should have restrictions either but after blowing a couple of seals, Precision recommend some.
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Old April 28th, 2015, 03:02 PM   #13
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Quote:
Originally Posted by Will at RSI View Post
If the scavenge pump system is setup correctly, you will have very little oil that makes it past the turbo seals. Generally when we see people complaining that they have oiling issues, it is from oil that has accumulated in the turbo after the engine has been shut off. If you ever fail to run the pump and start the car, you will certainly push about a quart of oil into both the compressor and turbine sides of your system in a matter of seconds.
I had issues even with 2lb one way check valves installed. Had to use restrictors to keep from blowing seals.
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Old April 28th, 2015, 03:06 PM   #14
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Originally Posted by 4X4 FGT View Post
You're scaring me man.
I'm thinking of using PVC pipe instead of metal to make it easier to fab.

Seriously though... it'd be fun to attempt on my own but my metal fab skilz would make it look pretty ugly.
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Old April 28th, 2015, 03:53 PM   #15
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I've given this advice before (I built and rebuilt turbochargers for ~7 years).

Turbo seals aren't really "seals" at all...they're small steel rings with a gap. One is on the front side (behind compressor) and one is on the rear side (behind turbine) and neither of them sees pressurized oil. Oil should technically never even make it to this part of the turbo; it should have already fallen (gravity) down to the bottom of the housing and out to the drainage system... If oil has any reason to "back up" into the bearing body of the turbo, then it can seep out through the tiny steel rings that have a gap in them and then it's smoke-city.

A restrictor on a journal bearing turbo is a bandaid fix that can ultimately cause damage... it's a better idea to fix your oil drain/flow problems instead!
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Old April 28th, 2015, 04:43 PM   #16
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Quote:
Originally Posted by tspargo View Post
Is this a custom, DIY turbo kit install?
Yes. Not unlike many of the other builds though. There are only so many places to put a turbo on these cars.
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Old April 28th, 2015, 05:45 PM   #17
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Quote:
Originally Posted by coupe View Post
I've given this advice before (I built and rebuilt turbochargers for ~7 years).

Turbo seals aren't really "seals" at all...they're small steel rings with a gap. One is on the front side (behind compressor) and one is on the rear side (behind turbine) and neither of them sees pressurized oil. Oil should technically never even make it to this part of the turbo; it should have already fallen (gravity) down to the bottom of the housing and out to the drainage system... If oil has any reason to "back up" into the bearing body of the turbo, then it can seep out through the tiny steel rings that have a gap in them and then it's smoke-city.

A restrictor on a journal bearing turbo is a bandaid fix that can ultimately cause damage... it's a better idea to fix your oil drain/flow problems instead!
I'm not an expert like you are, but I've rebuilt a few turbos myself and often wondered how you could "blow" the "seals" by pushing oil.. I will admit that I thought the sealing rings were there to keep oil contained as well as to keep the compressed air and exhaust gasses out of the oil.

I've pushed oil a lot trying to sort out my oiling system in the past and haven't hurt the turbos yet.

I'm currently running restrictors on my journal bearing turbos, but they are a great deal cheaper than these precision turbos so I didn't care if I ruined one.

I'll send Precision an email to confirm, but I think I'll chuck the restrictors and add another scavenge pump just to be sure.
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Old April 28th, 2015, 05:49 PM   #18
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What is the story with ball bearing turbos- is it different than journal bearing ones? Do they have seals?
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Old April 28th, 2015, 06:01 PM   #19
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If you need a restrictor and can weld then using a steel ntp to AN fitting . you can weld it shut on the bottom and then drill it out to the size you need. The nitrous tip and cut down AN fittings can be a pain in the ass. With steel you can torque it in pretty tight and not worry about it.
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Old April 28th, 2015, 07:59 PM   #20
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Quote:
Originally Posted by AndyMac View Post
Just picked up a pair of Precision billet 6766's (.96 T4 exhaust) with journal bearings and was wondering what people were running for oil inlet restrictors, if any..

I'm running a single EXA return pump.

Thanks,
Well here's real world results in my experience, on my PT7675's (.96 T4) I run .065" restrictors on each turbo.
From what I've learned over the years on many different applications it all depends on oil pump pressure and oil weight being used wether to run inlet restrictors or reduced feed lines.
Thats what works best on my viper, & I run a single timed EXA pump, no check valves, no drain tanks, zero oil problems, thousands of miles on them & still like new.




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