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Old 04-30-12, 01:24 PM   #26
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found this info direct from C. Ludwig:

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The AEM coils are the Mercury Marine IGN (no ignitor) and IGN-1A (built-in ignitor) coils. They are HOT. Output is around 100-115mJ @ 2.5ms charge time and up to 250mJ at 6ms charge time. For perspective, the MSD 6A boxes are around 105-120mJ and the "street" M&W boxes are 115mJ. We've constant dwelled the coil at 4.5ms on rotary applications with great success. You will not be able to run them constantly at 6ms. With the PFC it is possible to throttle the dwell versus RPM though to give a hotter spark when you're asking for it.

We were recommending customers purchase the Mercury coils from another shop over the parts we had available through our distributors long before AEM began rebadging them and they became available to us at a decent price through AEM.

In short, the new inductive coils are as hot as most street appropriate CDI boxes. They're spark duration is much longer (better starting, idle, and low-speed performance). They're usually less expensive. Are less complicated to install in most instances. And do not give off the high amounts of electrical noise that CDI boxes are known for.
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Old 04-30-12, 01:38 PM   #27
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^ Sweet info.

I am running mine at 4.5ms dwell time.
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Old 06-15-12, 07:43 AM   #28
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This looks like a sweet set-up. Seriously giving it some thought. Where did you pick them up at? Forgive, me if I missed it. I was speed reading the thread.
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Old 06-15-12, 09:48 AM   #29
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Quote:
Originally Posted by emperorbob5 View Post
This looks like a sweet set-up. Seriously giving it some thought. Where did you pick them up at? Forgive, me if I missed it. I was speed reading the thread.

http://www.lms-efi.com/
He is C. ludwig on the forum
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Old 06-15-12, 04:19 PM   #30
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For those asking about a CDI or "amp", with the IGN-1A/smart coil, this is not even an option. The built-in ignitor precludes the use of any kind of external device. As has been stated in the posts quoting our site, the coil is capable of outputting anywhere from around a 100mJ up to 250mJ based on dwell. Again for comparison, the common MSD 6A, M&W street, and Dynatech boxes are rated around 100-125mJ. This coil can deliver the same spark energy at a relatively low dwell period AND delivery a spark duration than is several times longer than any CDI. They really are the best of both worlds.

I can sell you an M&W box, and stand to profit a whole lot more, but the IGN-1A coils will produce more spark energy than most will ever need, are a relatively inexpensive choice, and have the potential to produce a better idle and low engine speed response because of a longer spark duration than any CDI.

The quoted peak output requires a dwell time of around 6ms. The coil can NOT be run at a constant dwell time of 6ms under continuous operation. It will fail. The most dwell we recommend for continuous operation is 4.5ms. Many aftermarket ECUs only allow a single, universal dwell setting. In this case, you need to select the highest setting that will allow the coil to live under continuous duty operation. Higher end ECUs allow mappable dwell, and in this case you can charge the coil harder on demand. For instance you would charge the coil around 3.0ms under normal loads but ramp dwell up versus boost and have more potential ignition energy available under high loads when it's needed.

Lastly, RENESISFD's comment that the coil would not fire at the correct time if it were charged too long is not accurate. The coils do NOT auto discharge like a few inductive coils are known to the do. If cycle time at high RPM becomes less than the requested charge time, you will simply not achieve the requested dwell time. Spark instant will remain the same.
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Old 06-15-12, 04:37 PM   #31
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so if the requested dwell is 4.5 but at 8500 I only have 3.0 then they will still fire but at a lower energy?
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Old 06-15-12, 11:03 PM   #32
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I was just about to relocate the coils on my car, so I think I may just go ahead and do this upgrade. Great info here, thanks guys!
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Old 06-16-12, 01:00 AM   #33
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Quote:
Originally Posted by neit_jnf View Post
so if the requested dwell is 4.5 but at 8500 I only have 3.0 then they will still fire but at a lower energy?
Yes
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Old 06-25-12, 11:24 AM   #34
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Tried checking out his website, but the internet here in Afghanistan thinks it's **** and has blocked it.
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Old 06-25-12, 08:56 PM   #35
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I ordered a set of these coils from C.Ludwig last week. I decided to do my own harness. I used braided sleeving through out with a sealed relay for power and a Delphi connector to connect to where the OEM ignitor used to be. I took the label under clear heat shrink idea from TwinCharged7.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

I mounted the coils to the old A/C location similar to what was done here

Car fired right up today for the first time with the new coils. The car feels smoother at idle and cursing around, additionally I noticed a slight increase in vacuum at idle.

I have not changed the dwell settings in the PFC yet as I'm not quite sure how the values in FC-Edit relate to dwell ms. However after running it for a while the coils stay bone cold so I know they are not being overworked. Im going to look into setting the dwell on the PFC, however I'm not going to stress over it too much as I will be switching to a different ECU in the coming weeks.
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Old 06-25-12, 11:20 PM   #36
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Everything looks great jhnrx7 except I think you should move your fuse closer to the battery.

Ideally you want the shortest distance to the fuse from the battery in case of a short.
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Old 06-26-12, 06:14 AM   #37
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Quote:
Originally Posted by RENESISFD View Post
Everything looks great jhnrx7 except I think you should move your fuse closer to the battery.

Ideally you want the shortest distance to the fuse from the battery in case of a short.
Good catch. I was concerned with making it easily accessible and I did not even consider that. I have extra pins for the relay so I can easily flip it around and re-pin the existing wire
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Old 06-26-12, 02:08 PM   #38
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For the record, I called C. Ludwig today and he said the harness runs about $100. So you're looking at $388 before shipping for 4 coils and the harness. Can't beat that. Compare it to that much if not more for a Twin power, plus you can sell all your factory stuff and come away with a less cluttered, less failure prone, new, and better ignition system. No brainer.
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Old 07-18-12, 08:19 PM   #39
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easiest thing to install, my grand mother can do it!!!!
at first when i received the coils, i was a lil scare to mess up, my friend had a lot of trouble installing the MSD or something coil and ignitor on his 240. i ask theWird and C.Ludwig for advise, but i only got it when i was done with it lol, but the good thing about it, its when i was done i have something to look at to make sure i didnt mess up.
i'm not a electric engineer, but i have a very good knowledge of electricity, even if i'm an Ironworker by trade. i often study Tesla and watch MIT class too. its a MIT course for free (for anyone interested, pm me and i'll tell you where to get the class videos.) anyway not to write a book. they easy to install and they are very good and not expensive at all. my idle is steady, better vacuum and no more hesitation. AEM ICHIBAN!!!!!!!!
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Old 07-19-12, 12:25 AM   #40
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How many mJ's do the coils put out at a dwell of 4.5 ms?
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Old 07-19-12, 03:04 AM   #41
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Quote:
Originally Posted by JhnRx7 View Post
I ordered a set of these coils from C.Ludwig last week. I decided to do my own harness. I used braided sleeving through out with a sealed relay for power and a Delphi connector to connect to where the OEM ignitor used to be. I took the label under clear heat shrink idea from TwinCharged7.
Do you have pictures of how they are mounted in the stock A/C position?
do oyu still use the stock power steering pump?
do you use stock-lenght spark wires or custom made ones?


Last edited by GoodfellaFD3S; 07-19-12 at 08:14 AM.
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Old 07-19-12, 07:50 AM   #42
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Quote:
Originally Posted by SpAm@FC View Post
Do you have pictures of how they are mounted in the stock A/C position?
do oyu still use the stock power steering pump?
do you use stock-lenght spark wires or custom made ones?


I will get a picture later tonight.
I still have the OEM power steering installed.
Custom length wires... OEM wires might work as the custom wires were pretty short.
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Old 07-19-12, 03:23 PM   #43
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Quote:
Originally Posted by Grant M View Post
How many mJ's do the coils put out at a dwell of 4.5 ms?
Honestly, I'm not sure. The numbers I've been quoted at 100-115mJ at 3.0ms and up to 250mJ at 6.0. Assuming a linear curve they should be in the 175-190mJ range at 4.5ms.

I'd like to build a board so that I can test the output, amp draw, spark duration, etc. Finding the time to do it will be the challenge.
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Old 07-19-12, 03:59 PM   #44
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I'm sold on these - Just need to workout where I can fit them into the engine bay!
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Old 07-19-12, 04:01 PM   #45
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Quote:
Originally Posted by C. Ludwig View Post
Honestly, I'm not sure. The numbers I've been quoted at 100-115mJ at 3.0ms and up to 250mJ at 6.0. Assuming a linear curve they should be in the 175-190mJ range at 4.5ms.

I'd like to build a board so that I can test the output, amp draw, spark duration, etc. Finding the time to do it will be the challenge.
That's sounds good. Like I said in PM I will be in touch soon about the coils. Think I have got a buyer for my twin power and stuff so should have some free cash
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Old 07-19-12, 06:20 PM   #46
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Installed shot. They are tucked away in there pretty well, so its hard to get a good shot of them. They are a nice fit in that location, however I might be moving them in the future because Im seriously considering re-installing A/C


Click the image to open in full size.
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AEM IGN-1A Mercury Marine ignition coil info/install-img_5087-jpg  
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Old 07-19-12, 06:54 PM   #47
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I have a PFC custom tune on a single turbo, will these coils PnP without a retune? I plan to get the car retuned down the road, but I'm doing a lot of work on it at the moment. I don't want to not be able to drive it if I install new ignition coils.
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Old 07-19-12, 06:56 PM   #48
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Quote:
Originally Posted by Nataphen View Post
I have a PFC custom tune on a single turbo, will these coils PnP without a retune? I plan to get the car retuned down the road, but I'm doing a lot of work on it at the moment. I don't want to not be able to drive it if I install new ignition coils.
I did not need to re-tune when I installed them on my car, but your results may vary. Lots of factors involved such as the state of your current ignition setup and what your current tune looks like. Thats not to say that there wont be more to gain from fine tuning after you install these.

Also, you will need access to a datalogit to adjust the dwell settings.
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Old 07-19-12, 07:02 PM   #49
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I need to just research tuning a rotary and tune it myself. I've personally tuned every other car that I've owned, but the 13b has me a little intimidated. I'm sure that everything is working well on my car at the moment, I just want to upgrade the ignition for future power goals and coil relocation.

My ignition seems to be a well functioning OEM system, and the tune was done by Rotary Performance in Garland, TX. I'm sure that it's pretty good in it's current state with only 300whp and 8psi.
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Old 07-20-12, 06:50 AM   #50
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I will get a picture later tonight.
I still have the OEM power steering installed.
Custom length wires... OEM wires might work as the custom wires were pretty short.
thank you for the picture and the infos!
This is the way to go for me, I hope you don't mind if I copy your design

@C.Ludwig

Is it possible to do a plug and play harness for this location without routing the harness to the stock igniter location?
So, that the adapter harness plugs into the stock ignition harness conector and a "dummy" connector for the stock igniter plug?
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Old 07-20-12, 06:50 AM
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