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2G Hx40 oil restrictor size

Posted by Koda, May 28, 2020

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  1. Koda

    Koda Proven Member

    58
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    Joined Jun 2, 2019
    Butler, Pennsylvania
    I’m not sure how much this matters but I just wanna treat this new Holset right so I measured the inner diameter of the oil feed fitting and I wanna know if it’s right . The one end is 5mm inner diameter and the other is 4mm which comes out to just about the size of the inner diameter of a -3an fitting
     

    Attached Files:

    Street Build 287  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. ThunderChild

    ThunderChild Supporting VIP

    2,945
    1,010
    Joined Jan 5, 2012
    Rathdrum, Idaho
    Are you asking if you should add a restrictor or not?

    Where are your feeding oil from?

    Most people are running straight -4an from the filter housing unrestricted for holsets, as long as you have a good drain you should be fine.
     

    Street Build 722  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    698  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 1K  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

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    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 3K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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    1990TSIAWDTALON likes this.
  3. red_devil

    red_devil Proven Member

    970
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    Joined Jul 13, 2005
    Richmond, Virginia
    Agreed. The drain is more important than the supply. You can run either -4an or -3an with no restrictior but make sure you use a large drain.
     

    2K  9

    1995 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  4. 91talonts1

    91talonts1 Proven Member

    619
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    Joined Dec 29, 2008
    Spencer, North Carolina

    Drag Race Build 4K  15

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  5. JusMX141

    JusMX141 Moderator

    12,836
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    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    Unrestricted from the filter housing is recommended as long as two conditions are met:

    1) The pressure at the inlet is at or around 75psi peak with a 4AN feed, and
    2) The drain is the recommended 12AN or 3/4" I.D. tube.

    Any other condition may require the use of a restrictor...unfortunately none of us can tell you what size is needed, except you want the restrictor to only be as small as needed to cut flow enough to meet 75psi at the inlet. Using smaller than needed will substantially shorten the life of the turbo.
     

    3K  0

    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

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    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

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    1992 Eagle Talon TSi
    manual · 1G DSM

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    1993 Eagle Talon TSi AWD
    manual · 1G DSM
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    1990TSIAWDTALON and ThunderChild like this.
  6. Koda

    Koda Proven Member

    58
    8
    Joined Jun 2, 2019
    Butler, Pennsylvania
    Thanks everyone , I’m running the the Morrison fab return line it’s 3/4”. So I’m pretty confident in this setup now
     

    Street Build 287  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Loading...
    1990TSIAWDTALON likes this.
  7. rabenne

    rabenne Proven Member

    1,330
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    Joined Apr 21, 2006
    Racine, Wisconsin

    Thread was answered in much clearer terms by others, you have added zero value to this thread. :thumb:

    What are you even trying to say? "So there is not just pressure set to run the turbo , but to evacuate the oil is entering from the turbo"? Whaaaat?
     

    294  7

    2008 Lancer Evolution MR
    awd · automatic · Lancer Evolution

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    1995 Eagle Talon TSi
    awd · manual · 2G DSM

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    1996 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  8. miguelmcv

    miguelmcv Supporting Member

    2,330
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    Joined May 3, 2009
    Fresno, California
    Got it, and fixed for you bro.
     

    Street Build 536  1

    1997 Eagle Talon TSi AWD
    awd · automatic · 2G DSM

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    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
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  9. Koda

    Koda Proven Member

    58
    8
    Joined Jun 2, 2019
    Butler, Pennsylvania
    Your telling me this is too small ? I’m not planning on pushing a crazy amount of boost

    B6820A61-349D-4B56-BF5F-7268F94A4594.png
     

    Street Build 287  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  10. frosh29

    frosh29 Proven Member

    197
    14
    Joined Jul 29, 2004
    Wallington, New Jersey
    I run from the oil filter housing no restrictor.

    Same drain as in the picture above.

    30 psi everywhere for over 20k miles.

    Turbo is still screaming and wheel is tight.

    Scott
     

    Street Build 233  1

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 400  1

    1991 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
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  11. 95FullSend99

    95FullSend99 Proven Member

    95
    64
    Joined Dec 3, 2019
    ledyard, Connecticut
    I ran a 10an return with a 4an feed and a .070 restrictor. Worked well for me.
     

    Street Build 603  15

    1997 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  12. iugrad92turbo

    iugrad92turbo Supporting Member

    10,549
    439
    Joined May 22, 2007
    Kalamazoo, Michigan
    No restrictor here straight from the ofh, 12 an drain.
     

    7K  5

    1992 Eagle Talon TSi
    awd · manual · 1G DSM
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