Well Harley send me over some LS2 coils which are coils near cop.

Well 1-2-Spark fires them. this evening did some soldering and yes it runs in my test-environment.

It works just as I thought, the coil needs 5 volt insted of 12 and runs at 4ms of dwell, making a nice spark. Tommorow I will buy some decent plugleads for this kind of coil, the 2cv plugleads are way to loose, make also a spark in the coil....
But hey it runs nicely...

Heres a video of it, don't be scared of the wires, it lookes more impressive as it is





something about ls-2 coil;

Historie:

Starting in 1997, General Motors used a new (for them) coil-near-plug
ignition system for the then new Corvette LS1 engine. The system
features eight coils (one per cylinder) mounted on the valve cover,
with short spark plug wires to connect the coils to the spark plugs.
The General Motors LS1 coils are not just conventional ignition coils.
Instead they are complete single-cylinder ignition systems. They
contain all the electronics for dwell limiting, current limiting, etc. These
coils are controlled directly by a low voltage, low current signal from
the sequencer. There is no intervening ignition module (like an EDIS or
GM DIS). Because the LS1 coils have the igniters built in, they make for
an easy installation and generate less electromagnetic noise in the
other wiring under the hood.

Over deze LS2/Truck bobines:

The LS2 coil-near-plug coils are similar in form and function to the LS1
coils described above.
The LS2/truck coil has a visible external aluminum heat sink near the
connector.

These LS2 coils are incredible. Even compared to the LS1 coil,
these are just crushers!
On the LS1 coil there is around 40 milliamps of peak secondary current
with 5 milliseconds of dwell time.
On the LS2/truck coil (AC Delco D585), there is 120 milliamps!

Hoe te gebruiken:

The LS2 coil has 4 connections (as well as the high tension terminal
for the spark plug wire, of course):
A = Coil Primary Ground
B = Ignition low noise ground from ECU (ground)
C = Ignition digital signal from ECU (+5V)
D = +12V Supply to Coil Primary




The two capacitors are optional but recommended. The 1.0 µF capacitor
on the +12V is helpful, it is similar to the one used on EDIS. What it
does is provide brief energy storage for the discharge. The other
capacitor will help eliminate back-fed noise to the MegaSquirt controller.
Use a 100 pF to 0.001 µF cap on the TTL trigger input wire to ground.
What this does is shunt extremely fast noise spikes to ground and not
let them feed back to the MegaSquirt processor. The added capacitance
is minimal - with the series resistance of 1,000 ohms (in the controller)
and a 100 pF capacitor the RC 3dB time constant is 2πR × C = 0.6 microseconds.


The LS2 built in coil igniters (the amplifier that drives the coil's primary
current based on the sequencer signal) will follow the sequencer signal
pulse width. When the signal from the sequencer is high (3 to 5+ Volts -
with very little current from the controller, a few dozen milliAmps), the coil
current will be building. When the signal from the sequencer is pulled low
(shut off), the coil will spark. The duration of the signal from the megasquirt /
sequencer determines the dwell (though the coil igniter limits this to no more
than ~8 milliseconds).

The dwell should be set at 5 milliseconds input pulse trigger - going longer
does not generate any more spark current.

To get 5.0 milliseconds of running dwell, the nominal dwell parameters should
be set to:
• Maximum Dwell5.5 milliseconds
• Maximum Spark Duration2.0 milliseconds
• Acceleration Compensation0.5 milliseconds
Battery Voltage Compensation

Setting Net Voltage Dwell Compensation

-4.0 8.0 Volts 2.4 milliseconds

-2.0 10.0 Volts 0.9 milliseconds

0.0 12.0 Volts 0.0 milliseconds

2.0 14.0 Volts -0.5 milliseconds

4.0 16.0 Volts -0.9 milliseconds

This will give 5.5 - 0.5 = 5.0 milliseconds at 14.0 volts while running with the
alternator charging normally.

Here is a video of the coil in action - with the LS1 on the test stand you can
hear the sparking, not loud but certainly audible. With the LS2/truck coil it
sounds like someone is banging on the table! The big resistor you see in the
video is part of a voltage divider setup. Its value is 100 megaohm (R1), in
series with a 100 Kohm (R2), this pair is across the spark plug. The voltage
across the 100 Kohm resistor is what is viewed on the scope

well all can understand that post
best p/m it?

why PM it? Geo is radically re designing the ignition system for the DIY market (us) its great to see the thinking and development as it happens. There is pictures too if your having trouble with the information.

keep it up Geo and keep it all open ( but look at protecting your ideas)

Yes i agree with sean. Protect them.

I havent had a chance to look at table with new software on laptop but will do this week and make sure it is reading right ......

I will send you my table to try geo ....

been very busy so not even seen 2cv for a week!!

table will come next week

I'm also bussy, today I shipped a 1-2-Spark kit to Stavanger Norway......

Now I'm going to get Harleys ready for running and shipping, 1. evening it worked 2. evening I played with the dwelltime and somehow I scruwed the unit ( and maybee the coil) and I've run out of microcontrollers so I ordered 15 new ones (from the money from selling the unit to Norway)...


When Harleys kit is shipped I'm going to implement the new sensor adaptor for Original Visa sensors I'm running out of PCB's also so I can make new PCB's with the new amplefyer...

Getting excited now Geo, I know you can do it.

Boggy

@ Harley, did some more tests with your LS2 coil(s) today, wasn't carefull for a moment, so the spark energie went trough my hand and arm, so now half an hour later I can still feel it......

Now for the LS2 coils, I've got them running great, but I can make a longer spark with the black 2cv coil... black coil about 1/2 an inch, LS2 coils about 1/3 of an inch..... but I think the spark is more intense then the black 2cv coil......

But still I don't see any advantige over a black 2cv coil, even not to mention the brown Visa or (yellow) Harley coil (what's in a name)....

But hey your the boss and when I can make you happy with driving 4 ls2 coils I will make you happy...

I had the dwell at 4500ms (0.0045 sec) as mentioned by Megasquirt and even at higher dwell numbers the spark doesn't get any hotter (my opinion).....

So everything I did today was in my office (livingroom) next plan is to connect all 4 coils and make them singing all together..... (Yes they really sing when multispark comes in)..

Multispark isn't an issue, the LS2-coil(s) takes it alll,

So overall not bad at all... (Damned my left arm still hurts)

So the next step is putting everything into one of my cars and make a test drive.......

Maybee I drive them to Spa Franchorchamps to show everybody and when it works fine I will sent them over to you........

So sofar it is looking very good...........

Cheers Geo..

p.s. did you see my video some posts ago LS2 coil running on 1-2-spark in test environment....

Yes!

Very impressed, I think I saw a flux capacitor in the background

Your dead arm is punishment from Thor due to not believing in the LS2

making a trip to Spa with them sounds great!

Well done & thank you!

Harley

No not a flux capacitor, but I'm making a hold to the hole in the ozonlayer, by making a lot of loose sparks.... somethimes I make such long sparks that the television start to interfaire and the PC usb-keybord strikes...