DIY LTCC or similar system for LT1s

[Tom B.]

The 93-97 LT1 pcms. the 93 is all by itself and is not a flash pcm. The 94-95 OBD1's are the easiest. 96-97 for OBD2. The only problem I have had with them is a lot of flashing issues and bricked pcm's. I had no issues for years and then had 6 bad pcm's. I don't know if it is the age or that the flash chips were replaced with substandard parts. I would like to find someone that could fix them reliably.
The delteq uses a Northstar module and coils. I would think you could use the coil pack and module from a 3.8 buick. The only fancy piece to the Delteq is a small convertor that replaces the stock coil and module. I would consider making my own convertor if I can get someone to back engineer them. I have too much going on to properly focus on that project. If any one would like to try it, I can send you one to decipher.

[Aroberson77]

The 93-97 LT1 pcms. the 93 is all by itself and is not a flash pcm. The 94-95 OBD1's are the easiest. 96-97 for OBD2. The only problem I have had with them is a lot of flashing issues and bricked pcm's. I had no issues for years and then had 6 bad pcm's. I don't know if it is the age or that the flash chips were replaced with substandard parts. I would like to find someone that could fix them reliably.
The delteq uses a Northstar module and coils. I would think you could use the coil pack and module from a 3.8 buick. The only fancy piece to the Delteq is a small convertor that replaces the stock coil and module. I would consider making my own convertor if I can get someone to back engineer them. I have too much going on to properly focus on that project. If any one would like to try it, I can send you one to decipher.

Once I get my car running more reliably I would love to see the delteq stuff. That is weird that you bricked the PCMs just because the delteq was hooked up. Vilefly is really on the right track with making a converter box for the opti signal. Tom there are people that fix bricked PCMs and if you are good with a soldering iron you can do it yourself as well. I know tunercat had a pretty cheap service to fix them.

Ras, the 94-95 LT1 PCMs run the $EE program and are by far the easiest to hack and tune with the available software. Check out SteveO's website fbodytech.com for more info on that PCM.

[Tom B.]

The delteq wasn't bricking the pcm's. I'm still not sure what was doing it. It didn't matter if they were installed in the car or on the bench. I checked and double checked my hardware and software. I had 3 of them repaired prior to the last bricking episodes. I would replace the chips myself if I knew where to buy the chips and how to do the initial flashing. I would really like to convert one to be an emulator for real time tuning.

[Aroberson77]

The delteq wasn't bricking the pcm's. I'm still not sure what was doing it. It didn't matter if they were installed in the car or on the bench. I checked and double checked my hardware and software. I had 3 of them repaired prior to the last bricking episodes. I would replace the chips myself if I knew where to buy the chips and how to do the initial flashing. I would really like to convert one to be an emulator for real time tuning.

http://www.goldsswagon.com/PCMFlash/...lashMemory.htm Have you seen this before?

getting back on topic, assuming we decode the opti signals successfully, what other true/false statements can be used to tell the demultiplexer which coil to fire? I don't think the stock PCM has any signal outputs for this since it uses a cap and rotor arrangement

[Tom B.]

Vilefly if you are close to a solution I am interested. I will post photos of the Delteq parts. The mounting brackets and convertor are the Delteq parts. The rest are standard GM coils and module. One thing I did like with the Delteq is that the engine would take 50 degrees of timing.

[Aroberson77]

Vilefly if you are close to a solution I am interested. I will post photos of the Delteq parts. The mounting brackets and convertor are the Delteq parts. The rest are standard GM coils and module. One thing I did like with the Delteq is that the engine would take 50 degrees of timing.

50 degrees?? that seems insane. we really need to see what is inside the converter. Do you at least have a wiring diagram or remember how the converter is hooked up into the system?

[Tom B.]

I have a copy of the diagram. Do you want me to send you a convertor?

[Aroberson77]

I have a copy of the diagram. Do you want me to send you a convertor?

if you want, the diagram would be great as well

[buddrow]

Most of what you want can be done with software, and you wouldnt need delteq hardware(which is likely supported by accompanying firmware). The coil driver hardware is easy, the software, on multiple cylinders is easy although the arduino would be taxed during higher rpm operation, looking at microseconds to process dwell time before the next trigger pulse is received.

Bud

[Tom B.]

Aroberson77
You have a PM

[vilefly]

Vilefly if you are close to a solution I am interested. I will post photos of the Delteq parts. The mounting brackets and convertor are the Delteq parts. The rest are standard GM coils and module. One thing I did like with the Delteq is that the engine would take 50 degrees of timing.

Still working on a solution between toddler attacks. Basically, all I have is on paper. I have the LoRes and HiRes signals tied together through an AND gate, going to a Flip-Flop coupled to a Exclusive OR gat to double the pulses I get (a workaround for only single edge triggering ICs), going to a 7-stage binary ripple counter (CD74HC4024E), and those outputs going to 4-input AND gates (5 of them) which decode the Lo-Res "large slots" correctly, and the 5th one for the 2 degree slots.
LT1_distributor_optical_disk.jpg
I just have to work on the switchover to a nice, mindless decade counter linked to a demultiplexer/data distributor chip which will be sending the ignition trigger pulse to the correct ignition transistor. It will only look for the leading edge of the Lo-Res signal, nothing more. The decoding gates will reset it at the 1st time, then it will recycle on its own. Switching to the simple setup will be plenty fast for anyone.....nanoseconds baby, nanoseconds. Only limit will be the ignition trigger/dwell signal from the stock ECM. Easily modified by anyone from there.

[Tom B.]

I have the Delteq convertors if you want to dissect one. PM me with your address if you want to look at it. I will say the only major flaw was the sealing and lack of a superior heat sink. The unit bolted directly to the cylinder head.

[Aroberson77]

Tom once I get the Delteq I will pull it apart and see if I can make a schematic so we can compare to Vilefly's work. I wonder if a better cooled and sealed Delteq unit would be the ticket. I would also like to get it to work with LS style coils since those are available everywhere and I can test with coils off my truck

[Aroberson77]

So my Opti officially died on me today, I did more research and there are some guys that have attempted to take normal hall effect signals like 58X and convert to the signals to the square wave that is seen by the PCM.

Apparently this chip can help: http://www.ti.com/product/LM1815

See this thread: https://ls1tech.com/forums/lt1-lt4-m...r-preview.html