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Since you're mentioning the new harness, I guess you're saying that the all-LH (low risk) method sounds interesting. You should be able to buy an ECU harness from 928 International, et al.
For the Megasquirt route, you wouldn't need anything original... though, the more you have, the easier the project would be. Not at all compable, but I used Microsquirt to create a fuel injection and computer controlled ignition system for my four-cylinder air-cooled motorcycle. I made the whole wiring harness, but used some connectors (for sensors and injectors, from junk yard parts); I made the intake manifold and fuel rail from copper pipe fittings; I used dual-tower coils from a Saturn SC for ignition; I made a crank position encoding wheel and modified the original crank triggers to use with this new wheel; I also had to significantly modify the air box, add an in-tank fuel pump and return line, add a bunch of relays, etc...
End result is an ECU controlled system, with port injectors, oxygen sensor and even a catalytic converter, instead of four carburetors and a relatively advanced (for 1982) electronic ignition system.
SQL, My goal is to use the LH Jetronic with the original CPU. If this for some reason should fail, I will have to go the Megasquirt way.
You project sounds very nice, but I think the LH conversion is the best for me.
but I don’t have the rest of the new harness anymore, so this will not be possible.
Wait, you don't have the LH harness? I think we are getting lost, please post up photos of everything you have so we can pinpoint exactly where you are at.
Originally Posted by SQLGuy
I think the lowest risk solution would be swapping the whole harness and using all LH fuel and ignition parts.
Even still, you need the front chassis harness to connect to the coils, ignition amplifiers, and back to the EZF. Swapping this entire harness isn't really practical which mans some custom wiring will be in order.
The difficult part he's dealing with is plugging everything into the relay panel. I had Z helping me and he re-wired my relay panel to be as close to an original 84/85 as possible adding wires to the A-Z plugs and adding two relays.
I had a difficult time finding a good EuroS harness for my project. I purchased three and after close inspection I ended up rebuilding the best one with all new connectors and pins.
The blue connector below had to be removed from the harness, and a connector for the earlier relay panel installed. The later cars have 10 pin connectors along the bottom.
Then wired up my relay panel to supply power via the same relay's and fused circuits as a stock EuroS. Mike (Z) made me a wiring diagram which detailed the changes. I'll be damned if I can find it though.
This particular car was going to be converted to MegaSquirt next, but I've decided on AEM Infinity 3 instead.
Wait, you don't have the LH harness? I think we are getting lost, please post up photos of everything you have so we can pinpoint exactly where you are at.
I do have the LH harness from the engine to the relay panel. Maybe my English is not exact.
What you describe in the photos with the blue is exactly what I need!
I still have the old harness. I guess this will help here?
No way to sugar coat this, you have a real mess on your hands.
Even if you have the LH/EZF harness, the ignition controllers need to be wired in and that harness is part of the front chassis wiring. Anyone doing this conversion would most likely make their own wire since swapping a chassis harness adds a lot of work. The wires for the ignition brains going to the EZF is a special shielded cable. If the proper cable isn't used, the ignition system will be susceptible to noise and all kinds of running gremlins.
Here are some photos of how I mounted the ignition brains and coils:
Is that a supercharged twin-dizzy/310hp engine I see?
I finally have taken some photos!
I have both coils fitted:
Left coil
Right coil
Both ignition controllers are also fitted:
These connection goes into the cabin and the relay/fuse box:
I have the two ECUs:
As I see it, I do have all the parts, but I need to connect the additional wires in the blue connector and the shielded cables as Hacker-Pschorr described?
03-11-2017, 02:31 PM
