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JDm Ecu...

Discussion in 'Electronics' started by 86gtscaged, Feb 28, 2007.

  1. 86gtscaged

    86gtscaged Guest

    Where to find one ? And what would it help ? I already run no egr/ no o2
  2. schmooot

    schmooot Well-Known Member

    there was much debate a while back on whether a jdm ecu will even make a difference with the jdm engine....or on a usdm engine. I can't remember how it turned out but they are hard to find
  3. rye

    rye Well-Known Member Donated!

    I think we came to the conclusion that a JDM ecu won't do anything significant unless you actually have a JDM engine to go with it....
  4. MITT4G

    MITT4G Well-Known Member

    Yeah Its best used on a JDM Engine that has no Egr or emissions due to the mid-grade gas thats needed....

    But if your racing then hey..
  5. malodin

    malodin Well-Known Member

    ive got one waiting to be plugged into a 3sge
  6. MITT4G

    MITT4G Well-Known Member

  7. schmooot

    schmooot Well-Known Member

    hmmm might be worth plugging in to my jdm engine just for shits and giggles eh
  8. underscore

    underscore Well-Known Member

    whats the code for the JDM 3S-GE ECU? I wanna know what needs to be on it so that when I go pick mine up I'm sure I got the right one. Though I can always use my USDM one while I wait, right?
  9. malodin

    malodin Well-Known Member

    as i am getting my turbo motor here on thursday or friday, i will not be needing my 3sge or ecu(or my jdm ecu) if anyone is interested in anything let me know, i dont really want to post a for sale on it yet, just letting you guys know it is forsale. the 3sge has a hole in the block but good head and everything else
  10. Thought I'd share my 2psi in regards to the JDM ecu.
    Any performance increase will be neglagable.
    A few things to keep in mind...JDM ecu's have more aggresive fuel and timing MAPS.
    Has nothing to do with their rated gasoline...this will have two outcomes if you use a JDM ecu.

    Depending on alot of factors such as weather conditions, load conditions, octane rating, sensor calibration, performance modifications etc etc....you might find yourself in one of two situations most of the time - better performance and worse performance.
    All be it you might find yourself in the latter more often than you think.
    The sensitivity of the JDM ecu in detecting knock will cause it to switch to CLOSED loop mode more often than with a USDM ecu.
    The more aggressive MAPS of the JDM ecu have lower tolerances than a USDM ecu. So poor or low grade octane, an old o2 sensor, gummy IAC valve, dirty AFM or any combination of those factors or all of them will yeild lower than expected performance gains.

    Also keep in mind that there were two versions of the gen1 3SGE...the 3SGE rated @ 130HP and the 3SGELU rated @ 160HP. The latter is rare and a JDM option only. Its belived that much higher compression ratios as well as slightly larger valves and cam profiles yeild the higher HP output. Using a 3SGELU ecu on a USDM engine will do nothing for you, in fact it will worsen your drivability.

    My opinion is forget about a JDM ecu, if you got one - great, if you can get one relatively easy for cheap - great, other than that dont waste your time or money on one - that money can be better spent on a better exhaust system.
  11. Youds

    Youds Well-Known Member

    three variations.....

    usdm ge 135
    jdm 150
    gelu 160

    iirc :) please dont make me go find that site again ;p
  12. Im asking you to go find that site.
  13. underscore

    underscore Well-Known Member

    everywhere I've seen it it's been USDM @ 135; JDM @ 150...
  14. Mafix

    Mafix Owner Staff Member Administrator Donated!

    the power gains are not all in the ecu.
  15. rye

    rye Well-Known Member Donated!

  16. Well I stand corrected - if however the difference between the 135 vs 150 HP engines is not entirely in the ECU, then in order to utilize the full potential of the 150HP engine you need its matching ECU....still not worth it IMHO.
  17. underscore

    underscore Well-Known Member

    thats what I had thought, but people told me the USDM will work fine...if it's making 15HP more though theres gonna be some difference right?
  18. rye

    rye Well-Known Member Donated!

    You'd think so.
  19. a service advisor at the Toyota dealer I worked at years ago had a 4G like mine and he blew his motor, bought a JDM engine and one of the mechs did the swap...used his old ECU and it ran fine, honestly if its only a 15HP difference I would say that its all in the ECU, hell I can get that from just advancing the timing.

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