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DIS Question

Guys, i'm contemplating trying a hybrid DIS ignition system using the Ford (gag) EDIS controller & crank trigger running 6 individual GM LS6 coils.

My questions are this:
The wasted spark system fires the original Ford dual coil units using one pair of driver wires per coil unit right.

Can one driver circuit wiring be doubled to drive two individual coils?

I'm not sure if two seperate coils require more driver circuit demand than the original Ford dual coil unit or if the demand would be comparable?

I'd like to know this beforhand rather then put it all together and find out the controller burns up or worse, the coils don't deliver their rated secondary ability.
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1980 911SC Slant Nose

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Old 12-17-2006, 05:53 PM
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I presume that you are wanting to fire two coils per cylinder for a dual plug setup. What ECU are you using to send advance information to the EDIS module. Depending on the ECU you may not need to use an EDIS module at all and just use 6x coil drivers. I know that on this board somewhere is info on a dual plugged Megasuirt setup running a wasted spark EDIS system.
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Steve Hall
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1988 930 Targa
1991 E36 BMW 318i
2004 Mercedes ML270
Old 12-18-2006, 03:50 AM
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I do not plan to run a dual plug setup, i'm going to let the wasted spark go to the 180* cylinder.
I will be using a Megasquirt ECU.

I do not want to use three Ford factory style dual coils but, use six GM LS6 style coils, with two coils being driven by one driver circuit.
This will allow me to mount six coils right onto the upper valve covers, very close to each spark plug.

This is why i'm trying to find out about the driver demand of two seperate GM coils versus driver demand of a Ford dual coil.
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Old 12-18-2006, 05:04 PM
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sounds like a standard wasted spark EDIS setup, but with individual coils. I see no reason why you can't connect two of the coils up in parrallel, have a look at this wiring diagram from
mpickett (a pelican member)
http://www.pickettweb.com/MSII/EDIS%20dual%20plug.jpg who has the dual plug Megasquirt EDIS setup. You may want to PM him.

The reason I keep refering to dual plug setups is that firing the wasted spark is like firing the dual plug spark.
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Steve Hall
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1988 930 Targa
1991 E36 BMW 318i
2004 Mercedes ML270
Old 12-18-2006, 05:30 PM
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I agree with what you're saying about the dual plug setup being esentially the same with wasted spark.

What i've found while trying to research my question on EDIS info sites is that virtually any coil can be used but, that info is based on using any dual coil, not based on using two individual coils onb one driver circuit.

You understand my concern about driver circuit overload.

Thanks for the lead to mpickett's thread, going to check it out right now.
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Old 12-18-2006, 05:38 PM
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I think thats why in the jpeg I linked mpicket used two edis modules driven by the saw output from the ecu. The load of driving the coils was carried by the edis modules.

This also has the advantage of allowing the ignition to operate independantly of the ecu. The edis module with no ECU input will fire the coils with 10deg of advance. The ecu only send the advance information to the edis module.

The EDIS upgrade I am doing does not have an EDIS module, I am driving the coil packs directly fom a signal from the ECU (Similar to using VB291 coil drivers with a megasquirt) I am using an EMS 3 Coil Driver (around $80USD) here is the schematic

http://www.enginemanagementsystem.com/images/EMS%204%20coil%20Igniter.pdf

Ask the guys at EMS and I am sure they will tell you whether a single coil driver pack can drive six coils or whether you need two packs.
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Steve Hall
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1988 930 Targa
1991 E36 BMW 318i
2004 Mercedes ML270
Old 12-18-2006, 08:29 PM
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I might just hook it up then scope the coil(s) secondary output.
It'll either work or not. If not, then dual modules will be required.

I may also talk to the megasquirt guys and see if dual coil drivers can be configured into the MSII.
If that can be done, no need for the EDIS modules at all right?
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1980 911SC Slant Nose

Can you say MegaSquirt !
Old 12-19-2006, 02:31 AM
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I am sure that you you could run 6 vb291 coil drivers, and then there would be no need for edis modules. Also make sure you a building a Meqasquirt PCB 3 as it has circuitry to accept the VR input directly
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Steve Hall
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1988 930 Targa
1991 E36 BMW 318i
2004 Mercedes ML270
Old 12-19-2006, 12:37 PM
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