MRG MotorSports 818S Build

[Bob_n_Cincy]

Most people are using the Wire Diet method where they start with the whole wire harness and remove what they don't need.
That's best way for most.

I decided to go the wire dissection method, where I would cut out only the parts a wanted.
See results.



Then after long hours of study on best routing and location I redrew the schematic.
Then I designed a waterproof ECU Panel.
See results;



That panel mounts in the firewall right in front of the motor (on the motor side).
Most of the cables plug into the motor. The cable on the far left goes to the dash, pedal, fuse box.
The top right cable goes to the starter, speed sensor, and neutral safety switch.
I will use a traditional wire method for all the light, horn & starter.
The relay on the left is the main relay and the other one is for the electronic throttle.
The engine ECU will control the dash, fuel pump and radiator fans ,
This CPU and wiring supports newer stuff like AVCS, DBW, and 4 coils.
OBDII port will be under the dash.
This panel will be covered by a blank triangle on the cockpit side to seal it shut.

The next picture is the engine side of the ECU box.



One of my design rules was not to have any junctions in the harness. The Subaru harness is loaded with them. I used the 6 pole stud type terminal blocks instead.
Let me know if you have any questions.