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Proper Internal Wastegate Installation on a Holset HX35 w/ BEP Bolt-On Housing

Posted by JusMX141, Sep 20, 2009

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  1. JusMX141

    JusMX141 Moderator

    12,761
    743
    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    Thought you guys would enjoy this.

    I just wrapped up building an internally-gated HX35 for a customer of mine. Instead of rigging a Garrett actuator on the backside of the HX35 cover as some suggest, I simply began with a HX35 from a Dodge truck that has the wastegate actuator provision on the compressor cover. The next step was to modify the existing Holset actuator slightly by shortening the rod a bit and bending a piece of rod that would mount to the Bullseye housing's actuator lever. Here's the end result:
     

    Attached Files:

    2K  0

    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

    5K  14

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi
    manual · 1G DSM

    3K  0

    1993 Eagle Talon TSi AWD
    manual · 1G DSM
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  2. DoyoFCT

    DoyoFCT Proven Member

    220
    1
    Joined Mar 31, 2005
    Dayton, Ohio
    Props, that looks really clean, almost oem. :thumb:
     

    268  0

    1990 Eagle Talon TSi AWD
    · 1G DSM
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  3. GSXeclipsePSI

    GSXeclipsePSI Proven Member

    547
    6
    Joined Jul 7, 2003
    New Port Richey, Florida
    How much does that all go for?
     
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  4. JusMX141

    JusMX141 Moderator

    12,761
    743
    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    I have no idea what the customer had in the BEP housing; I saw somewhere on here that the housings with an internal gate were going for close to $400 shipped.

    Add to that the cost of the HX35 core and the rebuild, and you could spend somewhere in the $800 region for a new turbo that is capable of outflowing and outspooling a Garrett of similar size, as well as being 100 times more reliable.
     

    2K  0

    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

    5K  14

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi
    manual · 1G DSM

    3K  0

    1993 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  5. andy4g63

    andy4g63 Proven Member

    914
    7
    Joined Oct 3, 2006
    NY, New York
    That is how you do it...
    Nice job, Jus... Looks f&*^%ing OEM...
     

    1K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM
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  6. red1993gsallmt

    red1993gsallmt Proven Member

    411
    2
    Joined Dec 30, 2002
    long branch, New Jersey
    hows that wastegate working, can you get over 22psi at redline?
     

    608  0

    1993 Eagle Talon TSi AWD
    10.429 @ 134.420 · 1G DSM
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  7. jm1080

    jm1080 Proven Member

    592
    3
    Joined Jun 13, 2006
    Boca, Florida
    Bump on that, hows the internal wastegate? I plan on doing this in order to keep my stock fan. By the way Jus, once I get this BEP Housing I will have it sent to you and buy hx35 with you as well! Just saving up. Hopefully before Christmas!

    BTW That looks real nice! Good job!
     

    493  0

    1997 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  8. Poloturbo

    Poloturbo Proven Member

    132
    2
    Joined Nov 8, 2004
    Montreal, QC, Canada
    Very interested in this reply as I saw in numerous thread that the internal gate on the BEP could'nt hold boost under 20-22 psi.

    I'm very interested in the internal gate as I could keep all the factory heat shields for road racing insted of going external.

    Ask Bullseye yesterday an the are BO
     

    321  15

    1995 Eagle Talon TSi AWD
    automatic · 2G DSM
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  9. JusMX141

    JusMX141 Moderator

    12,761
    743
    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    Do you mean under or over?

    Most guys are using the Garrett-style actuator that Bullseye provides on their internally-gated HX35's. What I've done here is incorporate the factory Holset actuator, which has a MUCH stronger spring tension, to help hold the flapper shut under high boost.

    This same actuator head has been used to hold 24psi to redline with plenty of room to spare on MHI turbos with 34mm flappers that couldn't hold over 20psi with a MHI actuator. The Holset actuator also holds boost well into the 30's on factory HX35 turbine housings which use a very small internal wastegate.

    I have no real-world results with the max boost level achieveable on the 38mm Bullseye flapper, but I'd imagine it to be well into the 20's using this actuator. Obviously boost control is not going to be as good as an external gate, but generally speaking no one buys an internally-gated housing with thoughts of running 25+psi in mind anyway...this mod simply illustrates that it's possible to use an internal gate to get a HX35 a little closer to it's efficiency range and well beyond the limit of stock head gaskets and bolts.
     

    2K  0

    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

    5K  14

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi
    manual · 1G DSM

    3K  0

    1993 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  10. dan2288

    dan2288 Proven Member

    574
    0
    Joined Sep 9, 2006
    Shillington, Pennsylvania
    Would the internal actuator be ok with 23-25 psi? Or would external be better. Not trying to spend $500 extra if I dont need to.
     
  11. JusMX141

    JusMX141 Moderator

    12,761
    743
    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    It should be, but keep in mind the internally-gated bolt-on housing costs more than one that has no flapper and is set up for an external gate off the o2. You may spend an extra $150 to make the turbo internally-gated while $150 more would set you up for an external gate off the o2.

    A Punishment o2 housing and a knockoff wastegate will work better for boost above 20psi....Talondave was holding 30-32psi at the end of last season with his HX35 and XSPower 38mm external wastegate once it was properly sprung.

    This thread was simply to show the proper technique for fabbing up an internally-gated HX35.
     

    2K  0

    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

    5K  14

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi
    manual · 1G DSM

    3K  0

    1993 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  12. red1993gsallmt

    red1993gsallmt Proven Member

    411
    2
    Joined Dec 30, 2002
    long branch, New Jersey
    with my internal set up i had anything over 20psi would just fall back to 20psi at redline, external was a big help.
     

    608  0

    1993 Eagle Talon TSi AWD
    10.429 @ 134.420 · 1G DSM
    Loading...

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