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Oil pressure regulator for Ball bearing turbochargers

Old Jun 22, 2018, 03:22 PM
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Oil pressure regulator for Ball bearing turbochargers

These are just my thoughts on these subjects on an internet forum.
Turbosmart released this not too long ago.

http://www.turbosmartdirect.com/Prod...lator-OPR-T40/

It regulates the oil pressure going to the CHRA. Some engines make alot of oil pressure and can send excessive amounts of oil to the turbo. This can lead to smoke issues, oily charge pipes etc . Crank case pressure can also be a factor though. Even 1 psi crankcase pressure can make the turbo not drain well. A built or tired engine is going to create more crank case pressure. Ringseal, different piston material etc. Its important to vent it correctly or address the issues. A spring on the dip stick is a bandaid on a larger problem. PCV and a sealed system for a street car is another semi related topic.

The turbosmart regulator doesn't eliminate the need for a restrictor on some turbo's but it is helpful to prevent too much pressure going to the turbo on start up and high rpm. The 4g63 makes a ton of pressure when hot and even more when cold. Remove the balance shafts and oil squirters and it goes even higher. Alot of people move to a thick 20-50w oil and it increases oil pressure even more. A restrictor is designed to limit the oil pressure and its generally matched for hot oil and full rpm. Some people get smoking after startup, its possible that the oil pressure going to the turbo is high and leading to oil having no where to go but out of the turbocharger.

Some history about my build. My engine is built with a stock oil pump but does have the oil bypass ported slightly.This will lower oil pressure. Startup oil pressure (5-40W) measured at the oil filter housing went from 110-120+psi @1300 to 80-90psi @1300. WOT oil pressure went from 115-125psi to 90-95psi . Going off the 10psi per 1000rpm rule its in the ball park for my 8000rpm engine( small turbo/back pressure limited )
Before I ported the bypass slightly I had well over 35 psi going to my turbocharger on startup even with a .030 restrictor. Once the oil was 160* I had 2psi at idle and 16-17psi at full rpm. After installing the Turbosmart regulator ( with the existing .030 restrictor) oil pressure on cold startup went to 25psi . Warm numbers were 1-2psi at idle and 15-16psi at WOT. This was on an old school FP Red. A different turbocharger or new CHRA may have less or more of a restriction internally (or a restrictor) so its important to test what pressure you have as well as what the manufacturer recommends.
In my case, startup pressure was reduced alot and the hot pressures were close to the same.

It may also be possible to adjust or modify the spring inside the regulator for different results. At your own risk of course.
Install is easy once you source the correct lines, and requires returning the oil to the engine. I chose the valve cover for my return line.

Last edited by Abacus; Jun 22, 2018 at 03:34 PM.
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Old Aug 2, 2018, 09:23 AM
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Awesome, Since this is twice as much as FP's 0.020 restrictor I might try that first and see about rigging up a gauge to compare to your numbers.

I put my boost gauge on my crankcase and never saw positive pressure, always 0psi when I was getting the smoking at low rpm and part throttle cruising. Smoke wasn't noticeable at WOT and the gauge showed vacuum (iirc -0.7psi) in the crankcase.

Hopefully between this regulator or the 0.020 restrictor I will find a fix for it. If not I'll have to sell the red and probably just put the ix turbo back on or get a hta71 and be done with it.
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Old Aug 2, 2018, 10:22 AM
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Always good tech from you, Tim. I look forward to seeing what my setup does with deleted shafts and squirters, kiggly HLA, proper bearing clearance for 50wt oil, .020" restrictor to turbo, and the ER oil pump gear.
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Old Aug 3, 2018, 01:03 AM
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What's then the pressure like then with that .020" restrictor? Depending on oil viscosity?
I also have the FB Black MHI turbo with the black restricton on my fully built 2.3 stroker, thinking of getting the purple .020" restrictor
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Old Aug 3, 2018, 07:52 AM
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Thanks Sean , Your build is going to be epic.

XSivPSI, Even 1 psi of crankcase pressure at the oil pan /return line can cause the oil to not drain. Measuring at the valve cover is the end of the line and may not represent exactly whats happening in the oil pan. A functioning PCV is also a good idea if you didn't have one before. I would put an oil pressure gauge on the oil feed line and get some data . If you're startup oil pressure feeding the turbo is higher then when the oil is warm /at peak rpm the regulator is a good idea if you are getting oil issues shortly after startup. Excessive oil can pool in the compressor housing as the engine is warming up then be pushed thru the system on the first few runs.


Originally Posted by Kevin Troy View Post
What's then the pressure like then with that .020" restrictor? Depending on oil viscosity?
I also have the FB Black MHI turbo with the black restricton on my fully built 2.3 stroker, thinking of getting the purple .020" restrictor
Every setup is different, its important to test what you have . IIRC the new Xona chra gets an update to run the .020.
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Old Aug 10, 2018, 12:21 AM
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I have emailed to Michael @FP just to confirm but haven't got a replay yet.
But I will do a adapter between the restrictor and turbo to see what pressure turbo is getting.
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Old Aug 13, 2018, 02:42 PM
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Originally Posted by Abacus View Post
These are just my thoughts on these subjects on an internet forum.
Turbosmart released this not too long ago.

http://www.turbosmartdirect.com/Prod...lator-OPR-T40/
Can you post a picture(s) for how you have this setup in your car? I just ordered one for my GTX3582r setup.
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Old Aug 14, 2018, 08:25 AM
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Old Aug 14, 2018, 01:00 PM
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^ Thanks

I can't tell where you have the drain going, but I am going to try and mount in that general area as well and use the -6AN block fitting from STM (balance shaft inspection hole) to drain back the oil. I'll post some pics when I get it installed.
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Old Aug 14, 2018, 02:04 PM
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The drain looks like it going into the valve cover right under the ignition cover.
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Old Aug 14, 2018, 07:29 PM
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Sean is correct. The return line is going back to the valve cover. Its pressurized so it doesn't have to gravity drain. The turbosmart regulator is fed from the head. It sends the reduced pressure to the restrictor that has a gauge mounted to it, then goes to the turbo.
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Old Aug 15, 2018, 05:27 AM
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Originally Posted by Abacus View Post
Sean is correct. The return line is going back to the valve cover. Its pressurized so it doesn't have to gravity drain. The turbosmart regulator is fed from the head. It sends the reduced pressure to the restrictor that has a gauge mounted to it, then goes to the turbo.
Good point on the fact that it is pressurized. I will try to send it back to the inspection hole in the block, but I can also send it to the side of the valve cover as I also have a -6AN fitting from STM for that spot that is currently not used. I have the big -10AN fitting where the stock intake manifold PCV used to be. Amazon is showing it won't arrive until next week so it may be a while before I have it installed.

Been doing a custom fuel pump setup on my GTR with a Hellcat 525 pump and a standard 340lph pump as well as converting it to Flex Fuel so splitting time between the two cars currently.
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Old Aug 16, 2018, 03:49 PM
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Would the Turbosmart oil pressure regulator work well on a PTE6870? Should I feed the regulator from the head? I will be running shafts and oil squirters and no modified oil pump. There should be no need for any restrictors in line, correct?
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Old Sep 25, 2018, 12:25 PM
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Hers from today the purple restrictor from FP I have put in. The pressure is around 6-10psi

Last edited by Kevin Troy; Sep 25, 2018 at 12:33 PM.
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