DIY LTCC or similar system for LT1s

[spfautsch]

You forgot that the optical disk turns a 1/2 crankshaft speed since it is connected to the camshaft. yes, it has 360 slots in it, but the computer turns it into 720 by counting both edges of the square wave signal coming out of it. This gives you 1 degree accuracy with respect to the crankshaft.

No, I assure you I didn't, just explained my thought process poorly. I have my doubts about the meaningfulness of the high resolution signal to the ECM. The amount of slop introduced by the timing chain at lower engine speeds makes it all but useless in detecting misfires, so what is it used for? I would venture a guess this is why GM went to crank mounted sensor wheels for obd-2 as it mandated monitoring crank angular velocity to detect misfires.

180 degrees out of phase is impossible.

What I was trying to get across here is the ECM doesn't care about sequencing anything but which injector to fire. By my understanding, because the distributor handles sequencing, spark is controlled as a single signal that pulses 4 times per crank revolution at varying degrees BTDC - i.e. in "batch" mode. Essentially the point I was trying to make, which after some reflection I think wasn't very meaningful is if we knew how the ECM decoded the opti signal it would be doing so with the sequencing geared around the intake stroke. Since no-one has yet to dump the code that this third processor runs, we don't know.

I did confirm rotor position with my spare optispark I will be using as a signal generator for my circuits.

With a degree wheel? Is it signaling at TDC or at some fixed advance point such as 15 degrees?

As to the triton VVT woes.....I was tasked with finding out the real source of the cam phaser problems. ... Nice fault tolerant design. pffff. Then there is the 2 piece spark plugs that seize in the head and break off.

Funny you also have such experience. One other thing not to discount is people running cheap oil that turns to the viscosity of water when it heats up. The one I had the displeasure of working on belonged to my daughter's at the time boyfriend. I found it odd when the kid called the spark plugs "two piece", but I soon realized it was sarcasm. The OE phaser design is lacking in that it resembles a vane pump, and is extremely fragile when the oil pressure drops, the proportioning valve can no longer control the cam but the pins are unlocked, and it starts banging back and forth in 60 degree strokes. Patent stupidity. Then there's the soft camshaft material and the pathetically inadequate indexing pin location. The whole design was just one poorly engineered stupid idea after another. When I pulled the one phaser off and realized the driver side cam had excreted the indexing pin and spun 180 degrees I told the kid to get it running and sell or trade it immediately. He did not heed my advice, so I later told him maybe he should replace the cams and oil pump and plan on keeping it. When I talked to him after replacing the cams and asked about the oil pump he said he hadn't got to that yet, but did change the oil. Just not the filter. Sometimes it's worth re-engineering the stupid in machines, but the only way to fix it in humans is with a bullet.