LT5 Ignition Systems Question???

[LT5 Ignition]

Thanks,
Some more ignition stuff:
I believe the 1990 LT5 engine was released prior to Northstar. One difference between Ignition modules. Northstar ignition used 2 VR crank sensors with 24 pulses (or was it 32 ?) per revolution rather than the 1 sensor and 9 pulses of LT5.

The ignition module uses suface mount components and is potted. Than a lid is sealed over. Typical sealing of igniton modules of the time not designed to be serviced. A serious electronics expert may want to try. Another thing it contains is a Motorola processor with EEPROM. If it lost its memory I do not know what one would do.
the whole module was made by Motorola who supplied it to Delco Remy who supplied it to the Chevrolet group. It does have a back up mode that allows ignition output if communication is lost from the ECM.

I would be happy to help discuss some after market system ideas such as MSD?
I'll check back Wed.

[LGAFF]

Any comment on the trigger system that was used on the two bentley motors?

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[XfireZ51]

LT5,

The approach that I took in adapting LSx coils was to try using the IM as the sequencer. Rather than have the IM actually fire the coil through ground signal, we built a circuit that converted the ground into the triggering signal used for the LSx coils. I built separate power and ground circuits for the LSx coils. They suck up quite a bit more power than is provided LT-5 coils. Each side of LSx coils needs a 20amp fuse. I was using the 2nd gen LSx truck coils which are the ones all the C6 guys rave about due to the 120k volt spark it throws.The motor would "start" but I suspect that the IM could not complete the timing "hand-off" after reaching the 400rpm threshold. I was able to achieve a Start to On transition several times with the 1st gen truck coils I had. The first time it ran, I found that I had two of the coils reversed in terms of sequence causing it to run rough. Once the coil sequence was corrected, motor started and idled smoothly but then came to a halt after blowing the 10amp fuse in the secondary injector circuit which powers the LT-5 coils.
I then built harnesses to completely separate the power and ground circuits for the LSx coils from the LT-5 circuit. In this configuration, the motor would only Start but not transition to On.