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rotorhead's Avatar
 
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Coil Pack Suggestions

Hi Guys,

I have my newly EFI'd 930 in the shop on the dyno being dialled in the moment.

Problem is it keeps blowing coil packs. I have gone through 3 now.

The mechnic sayas the Chrysler EDIS packs that goingsuperfast.com sent me with the kit aren't up to the task.

The system is wired from the ECU to a igniter unit to the coil



Any suggestions on a coil setup for my distributorless EFI ?
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1991 E36 BMW 318i
2004 Mercedes ML270
Old 02-17-2007, 03:21 PM
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Can you adjust the coil saturation time with your management sys? You need to find out how long they should be saturated. 2-3milli seconds is normal.
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Old 02-17-2007, 03:29 PM
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Coil pack.

Double the fun!!
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Haltech Dist.
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2003 GT3RS
1979 930/935
1995 993
2004 3500 Dodge
2006 Haulmark Toter
2005 three car stacker
Old 02-17-2007, 03:31 PM
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Yeah the ECU allows setting the dwell time and it is set around 2.4ms.

The coils in the link look like the GM units I am considering using and I am gratefull for the link to a shot of a setup. My only concern is whether they have the ignitor built in (Llike LS1 coils) or not.
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1988 930 Targa
1991 E36 BMW 318i
2004 Mercedes ML270

Last edited by rotorhead; 02-17-2007 at 05:08 PM..
Old 02-17-2007, 04:59 PM
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I use nothing but M&W. Some of the best around. I have never seen a faliure.
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Old 02-18-2007, 06:17 AM
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Quote:
Originally posted by Porschephd
I use nothing but M&W. Some of the best around. I have never seen a faliure.
I was going to suggest the same, but there's a little difference in price

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Old 02-18-2007, 06:35 AM
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Quote:
Originally posted by 125shifter
I was going to suggest the same, but there's a little difference in price

They sure are....but for good reason.
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Old 02-18-2007, 06:38 AM
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Here are mine....
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Old 02-18-2007, 08:44 AM
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oops, lets try again with pics.......





cheers
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Old 02-18-2007, 08:46 AM
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Thanks guys, I've printed out this thread and handed it to my mechanic.



Steve
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Old 02-18-2007, 05:23 PM
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M&W on mine
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Old 02-18-2007, 06:39 PM
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I never bought any M&W product, but there support is second to none. I have talked extensively both on email and the phone with Wayne at M&W and all the while he knew I did not own any of his products. Yet, still took a lot of time to help me out !

CHeers
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Old 02-18-2007, 09:21 PM
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We need more info here.

Hmm...most EFI's have ignition drivers built-in. Is there a special reason why you want to run it trough ignitor? What EFI and does it have the driver circuitry built in?

Also, what kind of ignition system do you use? Singe-plug? Dual plug? Six independent coils? Twelve independen coils? Six dual coils with one coil per cylinder? Six dual coils MUX-ed?

I suggest:
1. getting rid of ignitiors annd using built-in circuitry (if such exists in EFI)
2. using six dual coils in multiplexed manner (on twin-plug engine).


You ignitors are probably feeding too much current into the coils or your saturation #'s are out of tune.
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Thanks Beep,

The ECU is a EMS Stinger from http://www.enginemanagement.com.au, The ignition driver unit is also from them and specifically designed for this unit.

The wiring is shown below



This is a single plug setup, I have installeda 36-1 trigger wheel and magnetic sensor to go distributorless. The mechanic has had the car on the dyno and set the fuel and ignition maps up as far as 3500rpm when the second coil went.

As I do not own a dyno I have to let the shop do the work to dial in the ECU/EFI.

It is not outside the realms of possibility that they have blown the coils by incorrect setting of the dwell and blamed it on the coil pack. I only know for a fact the settings I had in the ECU when I took the car to them, not the changes they have made.
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Last edited by rotorhead; 02-19-2007 at 01:23 AM..
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OK, now we are getting somewhere.

As far as I can see, your EFI needs separate ignition driver to work. So far so good. Second, your EFI cannot feed more than four coils, which means that you are forced to run it in waste-fire mode to make it work with your six cylinders.

It means that coils are firing twice as often. I suggest torrough examination of dwell parameters regarding this issue. Also, check with manufacturer of EFI/ignitors what coil impedance they recommend.

I personally believe that dwell-numbers are tuned the way that leaves ignitors feeding the current to coils for too long time, making them overheat.

If you find no other way of curing the problem, you can try adding the shunt resistor in series of each of three coils.

Good luck!
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Old 02-19-2007, 01:42 AM
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Thanks Beep
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Old 02-19-2007, 01:53 AM
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I thought only Electromotive had ignitors built in. Supposedly the heat from the ignitors is one reason they have problems.

FYI, I went with a 4 channel CDI rather than use ignitors.
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Old 02-19-2007, 02:51 AM
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The Electro-motive does have the ignitors built in. I have been using the Bosche triple ignitors for years with no problems. I do like the MSd coils. I have used the Accel coils and stock replacement GM type coils as well. None of them have ever presented a problem.

How bout a link to M&S for their coils.
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2003 GT3RS
1979 930/935
1995 993
2004 3500 Dodge
2006 Haulmark Toter
2005 three car stacker
Old 02-19-2007, 05:14 AM
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