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Thread: 4g63 Swap Question

  1. #1

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    4g63 Swap Question

    I am about done with my swap but im hooking up the electric fan how did you guys do it i would like for it to run off the ecu and not by a toggle...

  2. #2


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    I'm running a fal temp switch that has an adjustible dial and controlled by a relay powered by the factory coil pack hot wire. Wires are 16ga for the relay connectors and 12ga for power from battery with fuse to fan, ground from fan to relay, from relay to ground.
    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.

  3. #3

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    Sounds like a good idea i cant seem to find what your talking about online...Links? Pics?....As a last resort can i run the motor with out the fan switch...Im running a 1.8 water neck ...and just run it to the key...

  4. #4


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    http://www.amazon.com/gp/aw/d/B00029...AC_SX112_SY192

    Made my own relay wiring as I had a few extra relays from the pick and pull. Also had a small spool of 12ga primary wire from home depo.

    http://www.amazon.com/gp/aw/d/B009HG...AC_SX112_SY192
    http://www.amazon.com/gp/aw/d/B003VA...AC_SX112_SY192

    If you don't have these on hand.
    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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    The oem truck coil has a 12v signal when the key is in the on position. I have 2 relays powered by this 12v signal. One is for the radiator fan, the other is for the fuel pump. I removed the coil, left the wire. Please solder and heat shrink your connections. The crimp connectors have the possibility to have poor connections at times.
    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.

  6. #6

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    I broke my Fan switch on the housing so i just run that instead and not hook up that plug on the Harness...because im about to order this stuff now lol

  7. #7

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    I im running Coil On plug set up...I have a wire that has a 12v single at on position that im going to use for my pump and what type of relay did you use for the Pump i have a Walbro

  8. #8


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    Used a relay from a dodge caravan I believe. Did you eliminate your factory engine harness? I deloomed the entire engine harness and removed a lot of uneeded wires. The fan switch wires were one of the clips that my harness no longer have. If you kept the truck harness, the coil positive wire is an ring connector for a bolt to pass through it. Easily turned into a spade connector.
    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.

  9. #9

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    part of the old harness is their i found the main power to the fuse box in the truck .... i then took a volt meter and found a good thick wire that got power when the truck key is turned (planning on using that for the fuel pump and fan)

  10. #10


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    I also eliminated my heater pipes. Removed the top pipe from the thermostats housing and installed a brass plug. This could have been a fan switch for me, but I choose less wires. The album I have does not have updated pics of my current setup. Won't find pics there.
    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.

  11. #11


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    Hope you use this to power a relay to the fan/fuel pump. In the dsm community it's known as a fuel pump rewire. Uses the factory harness to power the relay to use a nice thick power wire directly from the battery.
    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.

  12. #12


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    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.

  13. #13

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    So run i need 2 30 amp auto relays 1 for the pump 1 for the fan...

  14. #14


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    http://www.raktron.com/fuel/rewire1.html
    We have the bonus to have less wires in the truck if the truck started out as a carb. Also run the wires as you see fit.

    Come to think about it, the wires I used could have been 10ga. :s
    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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    I didn't have a relay kit for the fuel pump when I first started out. When the electrical load (ie blinker/headlights/brake light) increases, you hear the fuel pump slow down. Redid my fal fan wiring harness the same way and made a noticeable increase in fan speed. Used 16ga wires at first.
    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.

  16. #16

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    Ok Im about to order

    100ft red and black 10awg wire (always good to have extra)
    Bosch Relay 30 Amp with connector (fuel pump looked it up on walbro)
    Tyco Relay 12Volt 30AMP & 12VDC 5-Pin Relay Socket
    10awg Fuse holders
    Flex-a-lite 31147 Adjustable Temperature Control Unit

  17. #17


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    With the fuel pump you should have had two small wires. I soldered the larger wires to these after cutting them so an inch long. Your choice where to tap the relay energize circuit but I would suggest 12v feed from battery positive terminal. And use relay for fan powering the ground circuit, not power. Good luck.
    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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    Sounds good thanks for all your help

  19. #19


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    Keep us posted. Don't see a build thread. Lol. Input from members sometimes lead to good advice regardless if help is asked. 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.

  20. #20

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