Coil selection for coil per cylinder application



Coil selection for coil per cylinder application

Postby Strictly Attitude » November 28th, 2014, 10:09 am

OK so all the regulars who have kept up with my build or helped me out (Big Thanks). I am searching my options for coils to use in a coil per cylinder setup. I have acquired an expensive EFI ECU that has coil drivers built in that is run off a 60-2 trigger wheel and a cam sensor similar to how the LS engine gets it's info. Now I am looking for donor coils that won't break the bank. Ok so for starters I have contacted a few companies and started asking a few questions. I am not expecting the best answers here as they sell coils that are way beyond my needs as of right now. I need coils to get the project going and I don’t really want to spend $360 on coils designed to spark under 36psi boost conditions. Would it be nice yes but is it necessary for my build right now nope. A good set of donor coils for $100 or less is more where I want to be right now. Then down the road I can replace them one at a time if I want or when I add boost or nitrous.

My ECU is designed with 8 IGBT/8TTL or mixed according to the manual which means I’m confused what will work. This is where Grumpy drops 10 links and a load of info on me :shock: ;) :D . I think I will help to simplify this also and put what info I have down to share also.

Let’s start with definitions

IGBT - The insulated-gate bipolar transistor (IGBT) is a three-terminal power semiconductor device primarily used as an electronic switch which, as it was developed, came to combine high efficiency and fast switching.
http://en.wikipedia.org/wiki/Insulated- ... transistor
Article based on automotive ignition using IGBT
http://www.st.com/web/en/resource/techn ... 003911.pdf

TTL - Transistor–transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. It is called transistor–transistor logic because both the logic gating function and the amplifying function are performed by transistors (contrast with RTL and DTL).
http://en.wikipedia.org/wiki/Transistor ... stor_logic


I have looked on line to find more info but it there seems to be more forum info that really does not answer my questions or give me the information I want or am looking for. So hopefully this thread will narrow it down I have some assumptions I have made on these coils such as TTL coils are driver built in coils such as LS coils which I hear are a good coil even though from my talks with lance I do not need a coil with a built in driver as my ECU has drivers built in. Ok but if it is going to be cheap good coil why would I not run them? There is also CDI which is Captive Discharge Ignition such as MSD thrown into the mix also to make things a little more confusing. I would like to make a list and post it of IGBT coils donor and aftermarket to use best to worst well as best I can with the info available. Then a list of TTL coils donor and aftermarket again best to worst. And of course CDI coils. Now to make things complicated on this subject we have waste spark strategies thrown into the mix where you fire more than on plug at once allows use of less coils (cheaper alternative). That could be another list or add on for these lists.
"IF YOU CAN SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR SUSPENSION NEEDS MORE WORK!!"

John J. Coffey
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Re: Coil selection for coil per cylinder application

Postby grumpyvette » November 28th, 2014, 11:07 am

viewtopic.php?f=70&t=5916&p=18181&hilit=+ignition+coil+plug#p18181

viewtopic.php?f=48&t=275&p=7011&hilit=+ignition+coil+plug#p7011

viewtopic.php?f=70&t=270&p=1289&hilit=+ignition+coil+plug#p1289

viewtopic.php?f=48&t=275&p=337&hilit=+ignition+coil+plug#p337


my first thought here would be to visit a salvage yard and grab the complete wiring,connectors and coil packs off a late model low mileage wreck, AFTER discussing the price BEFORE you go and remove them with the salvage yard operator, I doubt youll pay more than $80-$100


BUT LOOK AT THE COST OF NEW PARTS
$60 for 8 new replacement coils seems like a bargain
http://www.am-autoparts.com/2003/Mercur ... 67229.html
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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Re: Coil selection for coil per cylinder application

Postby Strictly Attitude » November 28th, 2014, 9:27 pm

It sure does grumpy might be a pain to change over to accept a spark plug wire? From what I see the ign-1 is 45 each so I can get 8 or 1 hmmm lol
"IF YOU CAN SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR SUSPENSION NEEDS MORE WORK!!"

John J. Coffey
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Re: Coil selection for coil per cylinder application

Postby grumpyvette » November 29th, 2014, 9:53 am

seems like fabricating a custom,mounting bracket for the individual mount coils that plug directly on the plugs would be both a rather minor challenge and by far the less expensive option, but of course the individual engine design and ignition selected would dictate the type of coil best designed to work,
I doubt that it would take much more than an hour of careful measuring and a bit of cardboard and duct tape to come up with a functional design for a bracket that holds all four coils per cylinder bank and if you were a bit creative something made from perforated steel and bent so a top sheet surface covered the coils could be made to look rather trick,
especially if it was powder coated or chrome



A simple bracket off of the valve cover would mount them easily, in most cases


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the big advantage of the individual coil ignition with spark plug wires rather than direct mount comes into play when the cylinder head design would place the coils too close to exhaust heat sources , unlike the hemi design
Image
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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