Programmable Delco Ignition Module

[Xfirez51]

This thread has been quiet for a bit. Thought I'd knock on the door and see if there's any new developments here, altho I am sure VL400 would do that.

[VL400]

Actually has been a fair bit happening on the code, just havnt posted anything.

Module controlled dwell has improved heaps, have implemented a new filter algorithm for predicting the engine accel/decel - http://en.wikipedia.org/wiki/Alpha_beta ... _extension. Its been working well and tracks target dwell better than ever. Using my test bench in a mode that varies RPM faster than a real engine ever can (it does large jumps between teeth to simulate a heap of jitter) it does this now...

ABG FIlter.png (100.17 KiB) Viewed 6454 times

V017 has the new filter code, the bottom monitor dark blue is delivered dwell with orange the target. New filter has halved the error. It actually still looks really bad, but its the ECU that is introducing the spark jitter as it has no prediction code. Top monitor light blue is delivered spark advance with the ECU locked to 10deg. Even though its meant to be a fixed advance for this test it shifts the point where spark is delivered due to the unusual trigger jitter and eats in to the dwell time. I cannot predict that on a real engine where the ECU delivers varying spark advance, where I start dwell is what the ABG filter has improved.

But, good thing is the test bench jitter is just an extremely worst case scenario. This is a running engine with normal variation...

ABG FIlter run.png (48.17 KiB) Viewed 6454 times

And a rev showing the AE dwell adder in action...

Rev.png (58.1 KiB) Viewed 6434 times

Will flick you a PM, should be good to go on a test for the LT5.

[Xfirez51]

VL,

That's amazing work. Looks like it's tracking dwell very well. Is the over/under still within the range of the required (+/-) coil dwell times, ie between say 2-4msec.?
One question I'm thinking about is how do I make the harness adapters for your module? Another is, do I use the LSx coils or stock? Look forward to hearing more from you. Great stuff!

[VL400]

It would be well within required and is totally configurable for the target dwell to match the coil, but what is happening in the first pic should never happen on a running engine. The test bench simulates something that wont happen, the engine speed is oscillating way faster than possible with any sort of mass. Its is a micro controller simulating trigger patterns so can do things that wont happen in the real world but is good at testing extremes and seeing changes.

Bottom two screen shots are from a running engine and what is normal, the spikes above target are the AE (power enrichment etc) adder - same as the light blue EST dwell does.

I replied to your email for the rest of the questions. But either LSx coils or a bosch 4 channel ignitor to use the existing coils.

[Xfirez51]

VL,

I think we're ready to start testing here. Would like to make arrangements for 1 or 2 units.

[4x4sandman]

Hello,

Good reading here, love it.

Are these for sale yet? I did a quick search of ebay and google and didn't see anything. It would be going on a v8 vg with a live 808. Reason being, i'm supercharging (sta centrifugal) my (stock 200k) engine (for drags / skids) and i'm afraid the stock ignition wont handle 12psi, so I'm looking into multi coil.

Laurie.

[jenko]

am wondering will it run 12cyl with 808 ?

[VL400]

Hello,

Good reading here, love it.

Are these for sale yet? I did a quick search of ebay and google and didn't see anything. It would be going on a v8 vg with a live 808. Reason being, i'm supercharging (sta centrifugal) my (stock 200k) engine (for drags / skids) and i'm afraid the stock ignition wont handle 12psi, so I'm looking into multi coil.

Laurie.

Yeah they are available as a build to order, no official FS post for this reason. PM me if you want more info, with some changes to the dizzy or shift to a crank trigger it is possible to get 8 coils on it though.

am wondering will it run 12cyl with 808 ?

8 cyl or less is still a limitation of the 808 hardware and software.

[briney]

how well is this module sealed? would it be ok putting it in some sort of case and/or potting it? how big is it? i'm getting bits together to retrofit efi to a 4 cyl. bike engine using ls1 coils. i was looking at using the d1927a setup, but i don't think it'd like 11,000rpm!

[Jayme]

The delco won't like 11000 rpm either. Tables only go to 9600 and even then its pushing it!