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Thread: Using a Honda AEM EMS on a Mitsubishi 3000GT VR4

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    Forum User Feedback Score 0 Roy's Avatar
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    Cool Using a Honda AEM EMS on a Mitsubishi 3000GT VR4

    If anyone is looking for a cheap EMS solution you might find this useful.

    Original post: http://roycormier.net/2010/10/20/how...universal-ecu/:

    The AEM EMS 30-1020 is an older Honda EMS. At the time of writing this they can be found for about $500 or less, I got this one for $400 on eBay.


    Most of the Series 1 AEM boxes have internal jumpers that can be moved to change the Cam and Crank sensor types from MAG to Hall Effect. Unfortunately the 1020 doesn't have these jumpers, so some hardware modifications are necessary. So I busted out the multimeter and got to work tracing the Cam and Crank inputs.

    On the 1020 the Crank and Cam sensor inputs are on pins C2 and C4. These run to resistors R11 and R30, which are then connected to ground. To use a hall-effect sensor for cam/crank input the signal wire needs to be pulled up to +5V.


    I de-soldered the right leads on the R11 and R30 resistors then bent them out of the way. Then I soldered in some 2.2K ohm resistors and connected them to the right side of resistor R188.


    Then I had to change the position of jumpers JPC1 (coil 1 ), JPC2 (coil 2), and JPC3 (coil 3). I'll be using 3 coils on a 6g72 V6 doing wasted spark


    And thats it for the hardware modifications, now you just need to make a custom ECU harness and you're all set.

    ---------------------------------------------------------------------------------------

    I went down to the junkyard yesterday and picked up the Honda ECU connectors for $5.25. Then I spent a couple of hours last night making the custom ECU harness for the 3000GT VR4.

    ECU Connectors from a 1997 Honda Civic:


    Cutting out the stock 3000GT connectors





    All done.



    And it works.
    Last edited by Roy; 11-05-2010 at 02:50 PM. Reason: Changing my links

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  3. #2
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    very nice, you are braver than me

    Parting 6 speed
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    Im impressed. This is a good idea, but im not good enough with a soldering iron to trust myself to that kind of modification. It was asking alot to solder in my ECU's new capacitors.

    Post up after you get it tuned..

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    OP, you are a brave soul! I am glad I got my 3s AEM EMS v2 for the stupid low price I did. I would NEVER have the heart to hack up the original ECU harness like that.

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    -BOOSTTD- verified Feedback Score 2 (100%) mh3kgt's Avatar
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    Good work! I'd be too scared to hack the ECU harness off though....

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    Good job, if you`ve got faith in your ability why not!.
    GTO-TT, PTE 1200's, M20, Emanage Ultimate, OS Geiken R3C,
    TD04-16g`s, Maf-t. 13g`s 12.4@115mph / 16g`s 12.5@117mph.

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    Forum User verified Feedback Score 1 (100%) thor'svr4's Avatar
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    i wish i knew enough about circuits to do that, to me you might as well have been talking another language in that 1st post. my knowledge of resistors is limited to what i was taught sr. year in high school physics... one day ill make a real attempt to pick up computer stuff. congrads on trying something new and making it work.
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    Great work man. That actually looks fairly easy. You did the hard work which is figuring out what to change. I could care less about cutting the harness. Its your car, do what you want.

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    bad ass!
    Stealth RT/TT. BOOST.

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    the BOSS of jellow supporter Feedback Score 0 a2j's Avatar
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    wow, that is totally awesome! could you do that to my car?

    PS: btw nobody should ever doubt in Roy. He know what he is doing!

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