C.O.P Conversion 1jz/2jz

Thread in 'Technical Questions' started by Zammish24, Jan 11, 2019.

  1. Zammish24

    Zammish24 Member

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    Hi everyone, i've got a 1jz vvti from a toyota soarer, but i think the coilpacks are failing (i can feel a soft misfire if im cruising around 70mph and when i floor it, its flat as fuck). Instead of replacing them for normal OEM coils i want to convert them to coil on plug.
    I have done this to a mazda mx5 in the past and it was piss easy because all the wires i needed went to the igniter!
    Done soem of research and i'm tempted with the idea of Yaris coils however.....i cant find anywhere any information or wiring diagrams on how to convert them for a VVTI motor which run wasted spark, 3 coils shared across all 6 cylinders.
    I'm positive on JZ vvti ignition setups run the same so 2jz vvti will be the same
    any advice would be greatly appreciated.
     
  2. Japtorque

    Japtorque Member

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    can you borrow some known working coils from a friend to test? that might help you diagnose the problem,
    Im also looking to do this conversion myself in the future
    as for coils , lots of different types will fit , audi , toyota 2zz, honda, ls3 etc. lots tend to use the red audi ones as they look cool, and I hear the toyota coils from a 2zz will fit quite well

    the conversions will ditch the factory igniter , the igniter has the pin out on the plastic cover usually , so that might give you a clue of how to wire it up,
    each coil will have a +12v a negative ground and a signal wire I think , coils with 4 pins just use 3 pins the 4th is used to let the stock ECU know that its fired ..

    thats all Ive worked out so far, there are kits available for around £250 and they come with mountings for the cam cover and stuff making your life easier ,
    if you do buy a kit then please upload the wiring details :rolleyes:

    VVT-i_Igniter2a.
     
    #2 Japtorque, Mar 15, 2019
    Last edited: Mar 15, 2019
  3. Zammish24

    Zammish24 Member

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    Hi mate thanks for the reply, i replaced the coils for new ones.....and its fixed my ignition issues!
    Only problem i have now.... Ive bought 6 yaris coils... with no idea how to wire them in!
    All i do know is i'll have to wire them in batch

    I've done some research and i'll need something to replicate a IGF signal to the ecu, thats whats stopping me making a loom up tbh
     
  4. Zammish24

    Zammish24 Member

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    Right, after some research.... I have summed up a diagram... Anyone here able to tell me if im on the right path? I figured that we're ''faking" the igf signal using IGT signal to IGF.
    yaris coils btw.
    IMG_20190319_154919.
     
  5. Zammish24

    Zammish24 Member

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    Well my diagram above is wrong! After some more research ive come up with this!!!
    Didn't buy a kit i fabbed up everything and it worked!
    Even the same for 2jz vvti
    AND IT WORKS!!
    Link of it being tested


    IMG_20190329_100635.
     
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  6. Japtorque

    Japtorque Member

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    HI , great post. thanks for taking the time to research and test it out :worthy:
    I thought there was an issue with having to use a diode/led in the IGF circuit from what Ive heard/ read online, to tell the ECU that the Coil has fired ,
    and other reports of Tachs not working due to bad IGF feedback signal.
    But it seems from your post that its not needed ! possibly due to using Toyota coils possibly? giving of the right signal what are your thoughts ?

    so I take it you can just un-pin the factory igniter plug completely , and use the wires to connect the coils.
     
  7. Zammish24

    Zammish24 Member

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    because i used factory Toyota coils they give off a IGF signal which is a pulse which is shared for the tacho. any other aftermarket ones id assume they give off different signals/pulses?
    But either way this has TRANSFORMED the car, it feels very responsive.... similar to fitting a lightweight flywheel and it drives so much smoother too!
    honestly the main reason i used Toyota coils is due to the cost and how easily available they are!
    I didn't unpin the plug, i just gutted the igniter and wired them directly inside.
     
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  8. Wonkyum

    Wonkyum New Member

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    What about 3rd 4rd 6rd coils? I'm using lq9 truck coils.
    So...Should I wire the coil no.1 wired to IGT1 no.3 to IGT2 no.4 to IGT3 right?
    Also No.2 cylinder to coil 1

    Under pic is from mojo lq9 coils that I bought.
    So... where I wire connector B? They said ECU signal ground. Tach? IGF? Or IGTs?
    Screenshot_20190914-104950_Polaris Office.
     
    #8 Wonkyum, Sep 14, 2019
    Last edited: Sep 14, 2019
  9. john chiko

    john chiko New Member

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    Hi, can anyone supply the part number for the yaris coils that you used?
    THis would be for a stock Aristo 2jz VVTI engine.
    Thank you in advance
    John
     
  10. Japtorque

    Japtorque Member

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    try
    90919-02240 2nzfe
     
  11. Rneri029

    Rneri029 New Member

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    Would this be the same for non -vvti 1jz?
     
  12. onejay

    onejay New Member

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    I have just done this conversion to mine still running the stock ecu, i have not had it out yet but it starts and idles better than it did before

    non vvti 1JZ-gte
     
    #12 onejay, Feb 7, 2020
    Last edited: Feb 7, 2020
  13. own81

    own81 New Member

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    that's great info a mate is doing this conversion right now and im thinking of doing it to my 105 series landcruiser. i would assume i could do this to a 1fz-fe it has a similar coil set up standard like the 2jz waisted spark
     
  14. dorioki

    dorioki New Member

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    Hi guys. Any update on this? I tried messaged the scientist, but didnt get any reply from him togh.

    Any issue on the tacho after the conversion? Very muchbinfo needed
     

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