Coil on Plug options
Turbo Mini Forums

Well, these are the babies:



These are the so-called "Yukon" coils.

Just need to make a bracket to mount them off the rocker cover.

I've found some HT leads to fit. Just need to find a connector for the common lead.

These will work straight of the ECU logic circuit through a pull-up resistor, so nice and simple.

Maybe overkill, but who knows the benefit of a better spark at 22 psi boost?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

hmm interesting,

so these would happily pair up to run wasted spark if you runn a resistor from each coil?

I don't know of any reason why you could not wire them up to two ECU outputs and run them as wasted spark.

There is a diagram on the MS website showing how to wire them.

http://www.msextra.com/ms2extra/Ignition_P...3_schematic.JPG

You will need to bypass the MS ignition drivers (VB921) as they provide grouding for normal coils.

These need a 5v on/off on the signal wire.

Edited by Paul S on 27th Mar, 2009.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Interesting, they are being run as wasted spark anyway in that diagram.

If you wanted to run them as true individual COPs it would need 4 CPU outputs..... is that what you are intending to do, ie, use JS11 and D15 as well ???

The reason I ask is I was going to use JS11 (PA0) for boost control, although FIdle (PM2) remains an option if I can get my stepper motor idle valve I've been playing with to work right...

Schrödinger's cat - so which one am I ???

Yes, using four individual outputs from the ECU.

I'm going to use Fidle for boost control.

Leaves me with a problem for the tacho though.

May just take one of the coil outputs and tell the tacho that it's a single cylinder.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

i run my COP's waisted spark cause i was to lazy to add another 2 wires to my loom(and a cam sensor) to run the signals outside the megasquirt. i did however add a buffer between the cpu and the coil to protect the cpu from any accidents in the engine bay.

Edited by evolotion on 27th Mar, 2009.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Edited by Rod S on 27th Mar, 2009.

Schrödinger's cat - so which one am I ???

No plans for JS4/5 or 7 at the moment.

EDIT: Launch Control may come in handy.

Edited by Paul S on 27th Mar, 2009.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Schrödinger's cat - so which one am I ???

Schrödinger's cat - so which one am I ???

I'm not planning on adding any transistors, just pull-up resistors.

I had assumed that the Ground Switching method was the one to use:

http://www.msextra.com/ms2extra/MS2-Extra_....htm#groundpull

I had assume that these signals go positive for the dwell duration. When wired for wasted spark, they are inverted by the VB921 to created a grounding signal of the specified dwell.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

http://www.jbperf.com/

I was looking at this circuit - although I haven't really researched it, it was just Denis's comment that made me think (as I have a bag of 5V zenners to protect inputs)

http://www.msextra.com/ms2extra/MS2-Extra_...tion.htm#3coils

I'm not sure the circuit you are looking at is applicable for JS11 (COP D)...

But I may be wrong.

EDIT - Jean beat me to it WRT the 4th spark......

EDIT 2 - my link didn't work right, it's abot 3/4 down the page, called 5V PNP drive

Edited by Rod S on 27th Mar, 2009.

Schrödinger's cat - so which one am I ???

Rod, that is correct for coils without built in ignitors (VB921).

The LS2 coils have the equivalent of the VB921 built in.

With coil 4 from JS11, you just need to take a jumper to the proto board and add a 1k resistor of the 5v as a pull up.

EDIT: See what you mean, JS11 has no protection.

Edited by Paul S on 27th Mar, 2009.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

http://www.jbperf.com/

Jean,

Apologies, you did tell me that in one of your emails.

Rod, have you got a spare 2N3904 then?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Yes, my mistake about the other three - I had forgotten that D14/15/16 use transistor drives on the existing PCB anyway.

(transistors to drive LEDs ???? - or was it future proofing for the Extra code !!!)

Schrödinger's cat - so which one am I ???

Schrödinger's cat - so which one am I ???

Thanks, Rod, but I've just checked and we also have a whole load of them left over because we are using Jean's board for the injectors.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

my COP's actually requre a pull down resistor type signal, and therefore a PNP output driver as opposed to the NPN output of the megasquirt cpu. for a buffer for a regular coil a simple NPN transistor could be used, if the output is abused teh transistor dies and the cpu is safe, zeners will protect against voltage spikes, and alot of people use them, but i personally wouldnt use only zeners as its jsut a passive component, if it fails the cpu will still smoke.

so aye, transistors = best :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

EDIT any smal signal NPN transistor like the 2n2222a (from maplins) ought to be fine.

and sorry skim read the above posts and missed most of it , apologies for the repeat of info!

Edited by evolotion on 27th Mar, 2009.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Good - I thought you might have a few bits left over after buying the whole kit :)

BTW, the more readily sourced one in the UK is 2N5551, essentially the same but with a higher current rating. I prefer it because it has factory splayed leads to the standard 0.1" pitch so much easier to solder in the proto area.

The 2N3904s are probably the hardest component to solder on the MS board as they do not have splayed leads and the solder pads nearly touch each other.

Schrödinger's cat - so which one am I ???

Is it only me that feals a very large breeze blowing over the top of my head when I open this thread :(

Coil info for MS...some of which also goes over my head lol.

http://www.megamanual.com/seq/coils.htm

As for the white connector. I think you will struggle to find that at a reasonable price anywhere, as its part of the vehicle loom.
I do have some links somewhere of places in the US you could ask...but it wont be cheap.

What would make more sense....is to switch to an alternative connector.

I know my LS1 coils use a 4 pin plug...so you could make any wiring loom based on these instead.
http://www.m-cal.com/Products/MC04-765205/...seal-1.5-Series

and forget teh white connector altogether.

or use the same range of plugs from M-Cal, and use a 5/6 pin setup.

With most ecu's, you just ground pins 3+4 on the coils to a good earth point on engine or similar. With pins 1 + 2 providing +12v and trigger.

So effectively you really only need 4 trigger wires and a 12v feed. So a 5 pin plug would suffice depending on how your coils are bracketed.

I bought a lot f those AMP Seal plugs from M-Cal when I was making a new loom for my car. Bloody bargain if you ask me !!!! Other places are charging 3-4x their prices for the same plugs.

Edited by stevieturbo on 27th Mar, 2009.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Thanks Stevie.

I was actually thinking about cutting the white connector off and fitting something readily available in the UK like an econoseal or similar.

It's actually 7 pins, the five you mentioned and two grounds.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."