Programmable Delco Ignition Module

[immortality]

The new Powerbond balancers are listed as 6.55" OD

[Holden202T]

yeah I had to machine my trigger wheel to suit the serpentine pulley im using on the front, but it locates it nicely!

[immortality]

That's what I was thinking of doing with the gilmer drive, however those trigger wheels in your link are slightly smaller in OD than the balancer. More searching is required.

On an ironic note, the ignition system in my Senator is dead

Just need to figure out exactly what has failed but what ever it was it was sudden. My money is on either the ignition module or distributor.

[VL400]

Time for an upgrade

[Holden202T]

my brothers car was the same (VS V3 Ute - VT motor basically) started it one morning was warming up and just died, no start after that, we found the crank trigger in the dizzy was dead!

[immortality]

Is there any way this unit can track or monitor an ignition misfire?

[VL400]

I dont think it can be done with any sort of reliability. The normal misfire detection done by the ECU monitors a few things (TPS, load etc) along with the time between crank triggers to know that the engine should be accelerating but is not, knowing what cyl number should have just fired it can report it.

The problem is my module does not have any load indication such as TPS. So while it could detect an RPM drop following a coil firing it does not know if this was intentional with the driver backing off or it was just under really light load etc. It also needs a high tooth count trigger as you are timing things only during a firing window.

[immortality]

Gotcha

[Xfirez51]

Bit more has been happening with this, has been running my car for awhile on the latest hardware and has been perfect.

Finally got the code written for dwell control that can be independent of the ECU. The ECU still commands the spark advance from the falling EST pulse (so all your tuning is done in the ECU), but now the module has the ability to track a target dwell set by a 3D table (showed this a few months back)...

TargetDwell.png

And a screen cap from a running engine using LS1 coil dwell times...

Ign1.png

The top monitor, RPM in red and battery voltage in green. Bottom monitor has the EST dwell from the ECU in light blue (which is not being used in this mode), and then the red is a target dwell from the above table. Dark blue is what dwell actually got delivered. There will always be a little bit of jitter due to the module not knowing when the ECU is going to command the fire event (it changes with spark advance), I do however have velocity tracking code so under fast engine accel/decel the dwell is dynamically adjusted to try and match the target.

And some throttle, the light blue is from the ECU (which also has some dynamic dwell control) and what would normally get used...

Ign2.png

VL400,
I keep popping in to keep track of your progress. Now that your module controls dwell, would it be able to work w the LT-5 DIS, or replace it?

[VL400]

It should be possible to replace the lt-5 module entirely, I have not tried this though as they are not very common in oz!