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Thread: oil restrictor in turbo feed line needed?

  1. #1
    Hybrid booster
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    oil restrictor in turbo feed line needed?

    I just ordered a new 46 trim hybrid from FWDPerformance and their braided oil/coolant lines. I have heard about oil restrictors in the turbo lines and that excessive oil pressure can kill the turbo. When cold, my oil pressure at idle is right around 70psi but once warmed up is around 10psi at idle and raises about 10psi per 1000rpm. Should I be concerned about this being that the oil pressure gauge is reading from the same "splitter" in the front of the block that the turbo line comes off of? My gauge is tapped into the front of this "splitter.

  2. #2
    Supporting Member II Turbo Mopar Contributor zin's Avatar
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    Re: oil restrictor in turbo feed line needed?

    The vendor who would be responsible for honoring your warranty should be the one to answer this question....

    BUT, that being said, I wouldn't. 70PSI isn't that high and the only way you'll really be able to hurt a turbo with too much oil would be if the drain back was too small or plugged up with carbon, etc. Even then the only danger is that the center section would completely fill up with oil and pressurize the oil seals, pushing oil into their respective intake/exhaust streams.

    BUT, put a restrictor in and you may not have sufficient oil flow at idle, etc. Turbos actually would like to have a particular gallons per hour/minute, the pressure isn't as big a deal as you might think, though you will need a certain amount of it to push the required gph/m of oil... So oil pressure is kind of a second-hand way of ensuring the proper/minimum flow rate.

    Hope this helps!

    Mike

    PS You probably heard about the oil restrictors in regards to a dual ball-bearing turbo, they require less gph/m and so sometimes will run a restrictor.
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  3. #3
    turbo addict
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    Re: oil restrictor in turbo feed line needed?

    yea this restrictor stuff i been seeing lately is kind of annoying, cus if your going to go that route yet put -4, -6, etc, sized lines with the restrictor, then why bother and just go -2 all the way and not bother spending money on the other -# sizes for the oil feed , and then ditch the restrictor. or you could simply stick with -4 all the way and be just fine!!!

  4. #4
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: oil restrictor in turbo feed line needed?

    Quote Originally Posted by zin View Post
    The vendor who would be responsible for honoring your warranty should be the one to answer this question....

    PS You probably heard about the oil restrictors in regards to a dual ball-bearing turbo, they require less gph/m and so sometimes will run a restrictor.
    I agree with both of these statements

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    Re: oil restrictor in turbo feed line needed?

    Thanks guys, just wanted to make sure I'm good since I don't want to nuke my new turbo.

  6. #6
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    Re: oil restrictor in turbo feed line needed?

    If this is a new Turbonetics turbo it will come with a restrictor/filter. Taking that off will void your 1 year no questions warranty I do believe. After warranty is up, I remove the restrictor/filter and run a in-line filter using #4 line.
    Todd

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    Re: oil restrictor in turbo feed line needed?

    Quote Originally Posted by 4 l-bodies View Post
    If this is a new Turbonetics turbo it will come with a restrictor/filter. Taking that off will void your 1 year no questions warranty I do believe. After warranty is up, I remove the restrictor/filter and run a in-line filter using #4 line.
    Todd
    You call that a restrictor? I call it a shitty filter, lol.

    Some say too much oil pressure will cause it too smoke but I've run 70 psi on journal bearings for years as have others with no problems. If you install a restrictor, most likely you'll blow it up,
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    Re: oil restrictor in turbo feed line needed?

    I don't like the idea of anything that can clog up in my oil feed line
    Rob M.

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    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: oil restrictor in turbo feed line needed?

    Is the Turbonetics a filter or restrictor? I am guessing a filter, which shouldn't restrict too much? The restrictor recomended for use with GT-R DBB Garretts is not a filter, its just a smaller hole.

    For a journal bearing turbo, lotsa oil is good to have and proper drainage is the key to making sure it doesnt smoke.

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    Re: oil restrictor in turbo feed line needed?

    Quote Originally Posted by BadAssPerformance View Post
    Is the Turbonetics a filter or restrictor? I am guessing a filter, which shouldn't restrict too much? The restrictor recomended for use with GT-R DBB Garretts is not a filter, its just a smaller hole.

    For a journal bearing turbo, lotsa oil is good to have and proper drainage is the key to making sure it doesnt smoke.
    I had one and to me, its a very cheap mesh filter, so it does act as a restrictor and also a filter, which I found plugs up easily, found that out before my turbo went boom,

    Yeah, my DBB has a tiny hole, doesn't need much oil.
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  11. #11
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    Re: oil restrictor in turbo feed line needed?

    running -4 and using a restrictor? exactly my point as being useless lol.







    You call that a restrictor? I call it a shitty filter, lol.

    Some say too much oil pressure will cause it too smoke but I've run 70 psi on journal bearings for years as have others with no problems. If you install a restrictor, most likely you'll blow it up,

    Simon i couldnt agree more with that





    And thinking about this... wouldnt it be safe to say that a turbo is only going to take what can be fit in its space for oiling. Even at 70 psi thats not enough force to squeeze it past the seals any more than it is at 40. If it was then a restrictor wouldnt do anything anyway, and a filter would get annihilated. The return as one person stated IS important area for concern though we all know that and cant argue that of course.

    .

  12. #12
    Supporting Member II Turbo Mopar Contributor shackwrrr's Avatar
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    Re: oil restrictor in turbo feed line needed?

    cut open a normal garret or turbonetics turbo and you will see the restrictor is built in. The ebay turbos need one because the internal design is crap. DBB turbos need it just because of their design.
    Ian Adams

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    Authorized Vendor Turbo Mopar Vendor Chris W's Avatar
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    Re: oil restrictor in turbo feed line needed?

    Here's a photo of the Turbonetics brass inline oil filter. It's included with every Turbonetics turbocharger to prevent FOD damage during the 1 year warranty period. If not removed after the warranty expires it can easily become plugged and actually cause a turbo failure.

    The other filter (silver) was the in line version we initially offered. We have since moved to a higher capacity -4AN/-4AN red in line filter. The newer larger cartridge incorporates additional pleats to maximize the filtering area. This allows for extended service intervals. Replacement cartridges are available on our website.

    Oil restrictors for standard journal bearing turbochargers are highly discouraged. Dual Ball Bearing turbochargers do benefit from a reduced flow of oil since it is only there to reduce friction and provide limited cooling, not separate bearings from turbine shafts and bearing housings. Most newer DBB turbos are restricted internally. The older models did not have internal oil feed restrictions so oil was limited via external fittings.

    Chris-TU
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Re: oil restrictor in turbo feed line needed?

    Quote Originally Posted by 4 l-bodies View Post
    If this is a new Turbonetics turbo it will come with a restrictor/filter. Taking that off will void your 1 year no questions warranty I do believe. After warranty is up, I remove the restrictor/filter and run a in-line filter using #4 line.
    Todd
    lol, those stupid things do more harm then good!!!!

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    Re: oil restrictor in turbo feed line needed?

    Thanks for the pic Chris, perfect shot of what it is and damn straight they should be removed after the warranty period.

    Quote Originally Posted by shackwrrr View Post
    cut open a normal garret or turbonetics turbo and you will see the restrictor is built in. The ebay turbos need one because the internal design is crap.
    Never seen that, hmmmmmmm.
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    Supporting Member II Turbo Mopar Contributor shackwrrr's Avatar
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    Re: oil restrictor in turbo feed line needed?

    [QUOTE=turbovanman;825844]Thanks for the pic Chris, perfect shot of what it is and damn straight they should be removed after the warranty period.



    Never seen that, hmmmmmmm.[/QUOTE

    not that its technically built in, just that the hole in the casting is small enough not to flood the casing.

    Click image for larger version. 

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    see how small the passages are to the bearings, on the ebay ones(cant find a pic) they are like 1/4 in passages and it pumps oil like crazy.
    Ian Adams

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  17. #17
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    Re: oil restrictor in turbo feed line needed?

    Quote Originally Posted by shackwrrr View Post
    not that its technically built in, just that the hole in the casting is small enough not to flood the casing.

    Click image for larger version. 

Name:	CHRA-500x500.jpg 
Views:	171 
Size:	22.5 KB 
ID:	32311

    see how small the passages are to the bearings, on the ebay ones(cant find a pic) they are like 1/4 in passages and it pumps oil like crazy.
    That's a Ball bearing turbo your showing, on a journal turbo, so far, I've never seen a restricted passage.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
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    Aurora ignition wires for sale. Link to info

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  18. #18
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    Re: oil restrictor in turbo feed line needed?

    Quote Originally Posted by Chris W View Post
    Here's a photo of the Turbonetics brass inline oil filter. It's included with every Turbonetics turbocharger to prevent FOD damage during the 1 year warranty period. If not removed after the warranty expires it can easily become plugged and actually cause a turbo failure.

    The other filter (silver) was the in line version we initially offered. We have since moved to a higher capacity -4AN/-4AN red in line filter. The newer larger cartridge incorporates additional pleats to maximize the filtering area. This allows for extended service intervals. Replacement cartridges are available on our website.

    Oil restrictors for standard journal bearing turbochargers are highly discouraged. Dual Ball Bearing turbochargers do benefit from a reduced flow of oil since it is only there to reduce friction and provide limited cooling, not separate bearings from turbine shafts and bearing housings. Most newer DBB turbos are restricted internally. The older models did not have internal oil feed restrictions so oil was limited via external fittings.

    Chris-TU
    Chris,

    I purchased a used (but recent) T3 S60 sand the brass filter had been removed. Is there a special fitting to replace this? It doesn't look like 1/8 NPT I'm used to seeing in there.
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  19. #19
    Authorized Vendor Turbo Mopar Vendor Chris W's Avatar
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    Re: oil restrictor in turbo feed line needed?

    Turbonetics sells the replacement filters for $20 or so. You could also check out McMaster Carr for adapter fittings. Keep in mind the added oil supply line height may conflict with the wastegate actuator function.

    Chris-TU

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  20. #20
    turbo addict
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    Re: oil restrictor in turbo feed line needed?

    well all turbo's are restricted lol, they take whatever oil can get into their tight clearances haha Not sure what psi would forcibly squeeze excessive oil into the area the shaft rides but its safe to say its not going to be any oil pressure we see on these engines lol

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