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Thread: Natedog's 6g72 Turbo Swap

  1. #1

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    Natedog's 6g72 Turbo Swap

    Well I'm going to share this a little early, I don't know when I'll be able to finish it, but I try to work on it a little (or drink beer and look at it) daily.

    Basically Started with this....



    Bought this...


    Now working on combining the two. First issue was that the block on the DOHC had a raised portion that kept the passenger side mount from bolting down. I simply notched it out of the way.

    Used Montero 3.5 water pump and pipes, custom fab on the one on the back of the heads. Note the CAS will interfere with the firewall where it is. I'd recommend doing this swap with a 93+ engine if I had to start it over again... but I have a plan.


    3.8 Galant upper intake.


    Mated to the transmission.


    Sitting in the truck...


    I'm currently sorting out using the 3000gt power steering and AC compressor. I'm also looking at a single turbo instead of the twins, purely for easier fab. I'm trying to keep the power level near stock, I'm not sure how strong the stock transmission is...

  2. #2



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    Awesome build so far, keep is updated. I want to do this swap someday so this info is much appreciated, thanks!
    Josh
    09 BMW 335i E92 Twin turbo
    89 Macrocab 4g63 Turbo swapped & Bagged: Build Thread

  3. #3

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    I'm not getting much done right now, but taking care of some little things...

    Prosport Gauges in a Montero gauge cluster housing.

  4. #4


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    Very nice build. This swap looks very tempting to try.
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works.
    Why a mightymax? Why not? 18 psi FTW.

  5. #5

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    I have that montero housing and the prosport gauges the idea never crossed my mind

  6. #6

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    Got the Turbo today!

  7. #7

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    Bad ass build .^^^^^^g20. ??

  8. #8


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    I bet that sucker will Purrrrrrrrrrrrrrrr

  9. #9

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    Its a td06 20g. should be about right for the stock fuel system.

  10. #10

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    badass build man.. keep us posted. and that motor looks good in that engine bay! keep it up

  11. #11

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    I sourced a stock Evo 8 intercooler for the swap, I've been working on spinning the AC core around in it's brackets to output the AC lines into the bay. This will give me room for the intercooler, and I'll move the canister to the firewall, and make shorter lines all around while at it... I'll update when I actually do something on it!

  12. #12

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    Been making a little progress!

  13. #13

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  14. #14


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    How much room is there to keep the turbos on the sides of the engine? That pic with the turbo, looks like it won't be too happy exiting to the fender(exhaust). Had that same intercooler on my truck. Had to cut the pipes off the endtanks a little short for it to fit the way I wanted it.
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works.
    Why a mightymax? Why not? 18 psi FTW.

  15. #15

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    The problem with mounting the turbo's on the sides is space and orientation. Space could be achieved by cutting the the fender on the passenger side, but on the driver side it would get into the brake master cylinder. Also, in stock orientation the intake for the turbo's will point toward the firewall. If you change sides with them the intake would be rights, but then the stock o2 housings wont fit due to the mighty max engine mounts. Also in that forward configuration the turbo intake would interfere with the accessories.

    I'm not saying it can't be done. Old Colt over on the 6g72rwd forum has a montero he has been slowly working on, he's going to use the stock turbo's. However the Montero has different spaces in the engine bay. He machined an adapter to flip the manifold over on one side.

    For myself I felt it would be easier to use one turbo. My fab guy has thanked me.

  16. #16



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    This is going to be so badass, love the build. Keep the pics coming.
    Josh
    09 BMW 335i E92 Twin turbo
    89 Macrocab 4g63 Turbo swapped & Bagged: Build Thread

  17. #17


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    What about flipping the turbos? Making them top mounted? Maybe ony cuting the fenders above the tire wells would be required. Just a thought. And maybe speed density/blow through maf makes intake routing easier? Made mine a lot easier. Lol.
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works.
    Why a mightymax? Why not? 18 psi FTW.

  18. #18

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    The driver side one would be top mount using the stock manifolds, if you flip sides it puts the driver side turbo into the accessories. Again, just because I'm doing it this way doesn't mean it won't work the other, but I couldn't figure out a good way. I opted for less piping, not having to run the intakes of the turbo's together, or the compressor outlets together before the inter cooler.

  19. #19

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  20. #20

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    This will be AWESOME! Torque off boost, below boost, and all hellpower on boost everywhere else!! WOW!!

  21. #21

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    I definitely require more updates on this. What are you doing for motor mounts/transmission mounting?
    Coming from the 3000GT community, I HAVE to ask...
    You still got that parts car?

  22. #22

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    Quote Originally Posted by Blue91SL View Post
    I definitely require more updates on this. What are you doing for motor mounts/transmission mounting?
    Coming from the 3000GT community, I HAVE to ask...
    You still got that parts car?
    The engine mounts and trans are the stock v6 truck parts. I am modifying the pasenger site frame mount to clear the AC. My fab guy is almost done with the turbo set up. I will get some more pictures soon.

    Parts car is long gone.

  23. #23

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  24. #24

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    Working on the new CAS drive.

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  25. #25



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    I don't know anything about the 6gs, just wondering why the stock cas setup won't work?
    Josh
    09 BMW 335i E92 Twin turbo
    89 Macrocab 4g63 Turbo swapped & Bagged: Build Thread

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