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Miata Link using Coil on Plug Ignitors


Ken Maguire
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I have never seen this setup before and I am not even sure what a AEM Twin Fire is.  If it is a four channel CDI or something like that then it may or may not work with the ECU.  The ECU has two ignition outputs that fire twice per engine cycle to drive the wasted spark setup.  If the AEM thing needs four ignition inputs to drive four coils then it may not work with the ECU as you would have to wire each ECU output to two AEM inputs.  Some ignition units can not fire two coils at the same time.  It would probably be a wate to go to COP if you were to be firing the coild twice per cycle anyway.  Wasted spark arrangements are good for over 400hp so think hard before replacing it.  If you were to upgrade to an LEM G3 then you could have four ignition outputs and all the other benefits of the G3 ECU...

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Ashley, This is the AEM unit http://www.aempower.com/ViewCategory.aspx?CategoryID=78 There are two actually, a 4 and 8 channel dual capacitor. I'm trying to find out more info on it from the manufacturer. I do know that it is being used with the Miata stock harness and other programmable ECU's in a wasted spark configuration. What do you think? I'm hoping that the Link will fire it in the wasted spark setup too. I just don't have the schematic of the AEM yet. I'm familiar with your new LEM G3. I am trying to do this with out having to replace the ECU since it's not very old. Thanks Ken M

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If it works with other systems then there is no reason why it wouldn't work with the MiataLink ECU.  The MiataLink ECU will output a dwell time length pulse that is idle at 0V then goes to 12V for dwell, then back to 0V to fire.  The pulse will happen twice per engine cycle on ecah channel.   I know your ECU is not very old but if it is running Link software, chances are that it hasn't been updated for 6 years now, alot of technology has changed since then...

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Thanks Ashley, The Link I'm running is the Flying Miata ECU. It has the latest chip, and the ECU is for the 94-95 1.8 liter. I don't know what is involved in switching it to the LEM G3, but at this time, I do not have any money in the budget to discard it and buy anything else. Unless I win the lottery in the next month or so, it's not going to change. But thanks for the info you have provided on the COP's and AEM unit. My project is a slow one, and I hope to have it built sometime within the next several months. Ken M

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