EFR 6758 Repair
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This is a discussion on EFR 6758 Repair within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; So I was helping my buddy with his 2014 WRX put on an EFR 6758 turbo, and as he was ...

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    EFR 6758 Repair

    So I was helping my buddy with his 2014 WRX put on an EFR 6758 turbo, and as he was threading in the coolant bolt this happened...




    Now I know the entire housing can be replaced, but I was wondering if we could weld in a Steel 14mm to -4 AN fitting and have it not leak. Anyone have any ideas?
    2008 Victory Red Cobalt SS Turbo
    24 psi Tune, TurboXS Catless DP, Injen upper CP, Hahn CAI, Forge VTA BOV, twin Aeroforce Interceptors, Powell Race shop CABs, CM Lowering springs, Treadstone TR10 Big FMIC.
    2014 WRX Plasma Blue Pearl
    Stock...for now

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    Registered User Obeisance's Avatar
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    I don't have experience with this, so take my response with a grain of salt:

    what is that: cast steel? Iron? Since it's a turbo I bet you're figuratively playing with fire by trying to connect metals together. I suspect the worst that could happen after a weld is it would fail by cracking, cause the turbo to seize or drain the car of coolant or oil through the leak. If you catch it fast enough, maybe it would not even be so bad?

    Is the reason that the housing is cast because that is a cheap process? Is the surface of the casting hardened (ball peen or something)? If you weld something onto it, do you have the means to characterize the joint to be sure that the connection has similar properties to the casing?
    David - '05 WRX

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    It is Cast Iron I believe. Tested it with a magnet.

    Its coolant feed, so if it started leaking it wouldn't be detrimental to the car/turbo because the oil feed/return is fine. There are oil-only turbos that have no problems, but I dont want to run that chance of it leaking.

    The replacement cartridge is 800 bucks from Borg Warner.
    2008 Victory Red Cobalt SS Turbo
    24 psi Tune, TurboXS Catless DP, Injen upper CP, Hahn CAI, Forge VTA BOV, twin Aeroforce Interceptors, Powell Race shop CABs, CM Lowering springs, Treadstone TR10 Big FMIC.
    2014 WRX Plasma Blue Pearl
    Stock...for now

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    Registered User Obeisance's Avatar
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    Again, I have no experience with this.

    It sounds like you're going to end up buying one anyway if this fails, so why not give it a try.

    My rudimentary googling skills have returned this:
    Making turbo manifolds out of cast iron

    I suspect that cast iron is used because it is cheap and because this is not a load bearing part (thus the brittleness does not matter much).

    Apparently, it may be difficult to weld to the turbo due to differences in thermal expansion coef., hence that thread suggested heating the whole thing up during the process.

    Are there any high temp., solid gasket materials which would be better to use instead of a weld?
    David - '05 WRX

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    Interesting, I had not thought about using a gasket like material. Coolant isn't a very his PSI, maybe 20 or 30 at most so it would only need to fill that void. And you are correct, Either I try to fix it and if it doesn't work, he is out 800 bucks for a replacement cartridge. Either way, it doesn't hurt to at least try.
    2008 Victory Red Cobalt SS Turbo
    24 psi Tune, TurboXS Catless DP, Injen upper CP, Hahn CAI, Forge VTA BOV, twin Aeroforce Interceptors, Powell Race shop CABs, CM Lowering springs, Treadstone TR10 Big FMIC.
    2014 WRX Plasma Blue Pearl
    Stock...for now

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    bump
    2008 Victory Red Cobalt SS Turbo
    24 psi Tune, TurboXS Catless DP, Injen upper CP, Hahn CAI, Forge VTA BOV, twin Aeroforce Interceptors, Powell Race shop CABs, CM Lowering springs, Treadstone TR10 Big FMIC.
    2014 WRX Plasma Blue Pearl
    Stock...for now

  8. #7
    Moderator Donkey's Avatar
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    Maybe I am not understanding this but your buddy is just blocking off the coolant passages yes? As those are just set screws right?
    Resident Adviser @ WTF Tuning, LLC
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  9. #8
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    We were trying to hook the coolant passages up, and he torqued it down and it split.
    2008 Victory Red Cobalt SS Turbo
    24 psi Tune, TurboXS Catless DP, Injen upper CP, Hahn CAI, Forge VTA BOV, twin Aeroforce Interceptors, Powell Race shop CABs, CM Lowering springs, Treadstone TR10 Big FMIC.
    2014 WRX Plasma Blue Pearl
    Stock...for now

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