Ignition upgrade to a COP CDI system

[jackdaniel]

Guys,

I'm planning a ignition upgrade to a COP CDI system, and as I go along I will post all my moments of insanity, just incase someone is stupid enough to do the same thing.

I'm in the planning stages at the moment, but the basics are:
Motec CDI four channel (#41011) ignition module ($814);
Weapon X Performance Coils (approx $60USD);
Motec M400 ECU ($2319); and
Motec loom and sensor kit for turbo cars (inc a 3 bar MAP sensor) ($343)

The mod will be done at the same time as the Motec ECU (M400) upgrade, to take advantage of the ignition trigger signals from the ECU.

The ignition module (below) will allow a true sequential ignition to be used, with the benefits of being completely synchronised with the ECU, and controlled by it.

This will completely replace the Elan ignition - so no more coil issues.


I’m intending to do it in such a way that the OEM equipment can be reinstalled at any time, without issues, damage or evidence (not really sure why, as I intend to keep her forever, but you never know – an immaculate S4S my just come up).

It doesnt appear to be as difficult as it sounds, as Motec provides excellent online support and documentation, and the local dealer is an excellent bloke, keen to see what can be done - with affordable dyno time (est 3-5 hours will be needed).

Attached are the wiring diagrams, which are pretty idiot proof (mind you I can be a pretty big idiot), so you can see where I am headed.

M44-2[1].pdf

ecu-m400[1].pdf

The only information I have been unable to source so far is the pin outs of the CAS. There being no crank positioning sensor, everything has to come from the CAS.

There are 3 wires on the hall effects sensor, and 2 on the magnetic sensor which I'm 99% sure is only for timing data as its connected directly to the coil pack.

So, can anyone tell me what the CAS pin outs are? What signals do they actually provide, and a CRO trace if you have one.

cascompare.jpg

CAS.jpg

Hall Effect Sensor
Red is +12V supply, Yellow is to the UCU and black is the earth.

Timing sensor
White/red & White - both straight to the coil pack - presumably one to fire each coil.

So guessing here:
The Yellow wire from the hall effect sensor to the ecu is the referance signal and provides injection timing information (it seems like its non-sequential = all injectors fire on each pulse)
White/Red fires spark to cylinders 2 & 4
White fires spark to cylinders 1 & 3.

[bobbrown]

Try down loading the manuals (click manuals on the menu bar and ask for a user name and password) you will have a better understanding of what does what and when.
It is not impossible to add a crank angle sensor but tricky

Bob

[jackdaniel]

Try down loading the manuals (click manuals on the menu bar and ask for a user name and password) you will have a better understanding of what does what and when.
It is not impossible to add a crank angle sensor but tricky

Bob

Bob,

Yes mate, I have been trolling through the manuals, and thats wher I have gotten my info from so far. I will continue to do so for some time before I comitt.

The problem with adding a crank angle sensor is getting the position exact. I'm still considering it as an option, but the OEM ignition and injection works - so it MUST be possible using the existing sensors.

Jack

[jackdaniel]

If anyone has a spare few minutes when they next have the plug cover off - can you take a few measurements for me.

1. The distance from the top of the plug, to the top of the plug vally (A)
2. The diameter of the plug hole (B)
3. The distance from the top of the plug valley to the bottom of the cover thats in the centre of the cam cover (C)

As exact as possible please. A,B, C as per attached document.

Thanks

Jack

Measurements.doc

[bobbrown]

The problem with adding a crank angle sensor is getting the position exact. I'm still considering it as an option, but the OEM ignition and injection works - so it MUST be possible using the existing sensors.

Jack

A crank angle sensor does not need to be exact, close enough will do if the aftermarket ECU is any good you can dial it in with a timing light, been there done that. Like moved the internal crank sensor on a GM 2ltr 16V from inside the engine where on race/rally engines they fall off to an external crank sensor which I made up, 270HP from a 2ltr N/A!

Bob