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Thread: AE71 Tacho mod for modern ignition.

  1. #11
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    hey matt,
    Will this work with a ke70 tacho dash? I ripped it out and it looks like this, a bit diff to your pics.
    Also for the signal, do i use the wire from the ecu?
    ive got a ca18det in my corolla. thanks man.

    Last edited by johnblz; 28th August 2012 at 07:32 PM. Reason: to give more info

  2. #12
    Moderator dove grey 64's Avatar
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    nice work matt, could imagine the satisfaction you would have felt when you fired the car up and saw that it worked

  3. #13
    Senior Member Futo_gt86's Avatar
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    Digging this one up.

    Firstly, thanks for the write up, and I applaud your efforts!

    Got a couple of questions here.

    What is the variable resistor you have used pictured 1k, 10k, or 100k ?
    Also the Jaycar variable resistors have 3 terminals, where as the factory variable resistor has 2.
    There is an extra hole in the board that will accept the third terminal, but not used with factory variable resistor?
    Did you just solider it to this point?

    Did you wire this from one -ve of the COPs to the tacho?
    Or did your ECU (which I think was an Adaptronic) have tacho output wire that you have soldered in to dash cluster harness to run the factory tacho?

    Can this mod work with coil packs with separate ignitors running in wasted spark?
    Or, is this mod specific for coil on plug conversion set up only?
    If COP only, where yours wired in batched pairs wasted or sequentially?

    Any help would be much appreciated.
    Last edited by Futo_gt86; 2nd March 2014 at 07:15 PM.

  4. #14
    Veteran LittleRedSpirit's Avatar
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    Its been a couple of years Ill try and remember.

    I had Cops in wasted spark, but it shouldn't matter what you do if its getting the signal from the right source. I believe I used the tacho wire from the adaptronic connected to the factory tacho wire that usually goes from coil to tacho cluster, blue wire from memory on the adaptronic loom, and black wire in the car I think, at least in my scenario.

    The spare wire on the cops is unused un this application as they need to be brought together and connected to the factory computer to create a tacho signal from memory in the standard application. This is redundant here.

    The variable resistor value was slightly higher than the factory variable resistor. I cant remember the figures, but I believe the factory variable resistor will be adequate. If you insist on swapping it out then just test its values with a multimeter and purchase one with a more broad range of adjustment. Its great, it lets you wind the needle up and down to sync it with your ecu tacho. Cant remember what I did about the three pronged resistor, I guess I just tested and found 2 terminals that had variable resistance and installed those ones to the board. Is the hole for the third even wired in on the board?






  5. #15
    Senior Member Futo_gt86's Avatar
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    Cheers for that.
    Mircotech LTX8 I'm using has Blue/White wire for tacho, I'll connect to factory tacho coil wire.
    I don't have COP yet, but understand IGF is disregard, and why.
    I have left the factory variable resistor in place, I have a few different value variable resistors as back up, like 30c each pfft.

    I'll go to PM for the rest as is not relevant to topic.
    Thanks,

    Ali

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