coil on plug | AEM
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ericfilion64
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coil on plug

hi i want to know if i can use rsx coil with the aem ems v1 do to COP. on a dodge srt4 factory setting wasted spark . can i use the extra coil driver 3 and 5 and then active those in the ems , do i need an external igniter ? thank you

AEM_NS
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The SRT4 EMS has internal

The SRT4 EMS has internal coil drivers to directly drive the coils.  Honda K Series coils are "smart" coils that need a 5v falling edge signal which the SRT4 EMS does NOT output.  The EMS would have to be modded in order to output the correct signal but AEM no longer supports the Series 1 thus we're not able to perform this work.  

ericfilion64
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hi can i use dumb coil 2 wire

hi can i use dumb coil 2 wire and use 4 of them to do direct fire with aem twin fire box? then get the extra 2 coil output from the aem ems and send them to the twin fire, then go in the aem pro activate the 3-4 coil outout . this will do the job or i need to do any modification still ? i saw some honda guys with the aem 30-1050 box moving jumper around so i need to do the same or my box is ready to turn on coil 3-4 thank you :)

AEM_NS
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Yes, you can do what you said

Yes, you can do what you said but there are two buts.  But #1 is that Coil 3 and 5 are available (not Coil 3 & 4, see the 1510 instructions for pin out) - you'll need to phase them correctly in the software to get the coils to fire in the correct order.  But #2 is that you're really not gaining anything going sequential ignition with a CDI.  I'd just stick with wastespark because there won't be any appreciable difference in performance.  To wire the Twin Fire for wastespark, you'd wire each of the four coils individually to the CDI but then split the two coil triggers from the EMS to become four trigger inputs into the CDI.  Be sure to configure the CDI to accept a 12v rising edge trigger.   

ericfilion64
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well i try to get more spark

well i try to get more spark than facory setup wasted spark on a single coil , are you telling me that if i put 4 single coil ( Coil on Plug)  by activating the the extra coil and run them sequential i wont get any extra spark? thank you for your help.

AEM_NS
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You missed an important

You missed an important detail in my post - you won't be gaining anything going sequential spark over waste spark if using a CDI.  The problem with your setup is that the coils are direct drive meaning there are transistors inside your EMS that are switching the coils on and off to make them fire.  This means all the current and heat associated with the ignition is going through your EMS.  People have damaged these drivers and their EMS by using coils with too low a resistance or by running too much dwell.  In most cases the limit to a waste spark ignition systems spark energy is how much dwell the coil can take before becoming heat saturated.  And obviously this is compounded by the fact that a waste spark coil is fired twice per cycle instead of just once like sequential ignition.  Again, the limit here is having direct drive ignition where the EMS is having to directly drive the coils.

Going with a CDI would be a great idea because you're removing all the current and heat associated with directly driving the coils out of the EMS. Another benefit to using a CDI is that the coils aren't "dwelled" - they're blasted with a short 500v pulse.  Because you don't have a dwell limit with a CDI system, they can support much higher rpms (much higher than any normal automotive engine could ever run) which then means that they can support fairly high rpm if being fired twice per cycle in waste spark.  

ericfilion64
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If i go sequential can i

If i go sequential can i still use the CDI with it ?Or the only benefit is with the wasted spark system? In the aem tuner i will have to switch ignition to all CDI execpt ford right? Then phase the coil properly i guess. Witch safer ways is better your think  to plug the COP like oem and add the CDI system to it an leave the coil dwell setting like oem. Or sequenttial witht he 4 coil output from ems with or withous CDI . Also i was reading that the twinfire CDI people was having lot of issue with them (lot of fail) overheat ect . can you give me a your feedback on that ? THANK YOU. AEM_NS

AEM_NS
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Ok, this is my last post on

Ok, this is my last post on this.  This is a Series 1 which I'm not even supposed to be spending any time on.  A CDI is good either way - sequential or wastespark.  There will be no benefit to running four CDI COP coils with a CDI box and adding in two more trigger wires to run sequential.  Save yourself the trouble and just run a CDI with four COP coils in wastespark and leave the wiring alone.  Then you don't have to change anything.  And yes, set the dwell to CDI.  Twin Fire reliability seemed to be spotty for some customers.  The later ones had many updates and they were pretty reliable but it might be worth your time to invest in something like an M&W.