Originally Posted by DC5Daniel (Post 12417454)

The Adaptronic article was more for that particular individual's self inflicted problem with a ground loop, though it does help explain the concept of loop area. I wanted you to see Chris Ludwig's advice, and how it has evolved over the years as communities got more experience with these coils. Again, he is the "expert" on these coils in these cars.


The generally accepted method, which all the professionally built harnesses for these cars choose to do, is to connect the logic/sensor ground to the same location you ground the secondary return (which is segregated by front and rear rotor). This is not "correct" as I explained in the linked thread, but the reason you can get away with this is because this ground is for the logic trigger of the coil, which has tolerance on the logic levels by design. The correct way would be to connect all four logic grounds to sensor ground on the vehicle harness (same ground for TPS and any other sensor with a dedicated ground back to the ECU), but virtually no one does this and it seems to be OK. As I explained in the other thread, the whole purpose of using sensor ground is so that the logic threshold does not unintentionally shift due to ground offsets caused by high currents in the power grounds. Any ground on the engine WILL experience an offset, as the Adaptronic article helps explain.

The secondary ground is more critical because it is the return path for the spark; this ground directly impacts the spark performance of the coil. The whole reason you have upgraded to these coils is the improve spark performance...which is why it makes no sense to increase the loop area and rely on the sandwiching of the irons and plates to make the return path of the entire keg "look" the same, which it's not when talking about a high energy pulse signal like spark.

Originally Posted by D4rw1n (Post 12435809)

I can’t find my original install instructions for the SakeBomb kit. My harness appears to be different from what is currently in the kit. My harness looks like the one they sell with the RHD kit. There is a small black wire with a ring terminal coming off the adapter harness, I have it tied into the harness that goes to the map sensor for some reason. Does anyone have a copy of the original install, or know what this wire is for?


https://cimg5.ibsrv.net/gimg/www.rx7...67c84ea4f.jpeg
https://cimg2.ibsrv.net/gimg/www.rx7...e3398e22d.jpeg
https://cimg6.ibsrv.net/gimg/www.rx7...252f51c93.jpeg
https://cimg4.ibsrv.net/gimg/www.rx7...1bfd921da.jpeg
https://cimg8.ibsrv.net/gimg/www.rx7...87c1b90dba.png
https://cimg1.ibsrv.net/gimg/www.rx7...a7477e0c7e.png

Originally Posted by RENESISFD (Post 11137240)

Everything looks great jhnrx7 except I think you should move your fuse closer to the battery.

Ideally you want the shortest distance to the fuse from the battery in case of a short.

Originally Posted by EpyonFD (Post 12417549)

Thanks DC5Daniel and Vicoor for the explanations, appreciate the detailed posts.

Alright so now does the below diagram look correct?
https://cimg0.ibsrv.net/gimg/www.rx7...0d8df276fb.jpg

And below diagram is technically not correct but does still work as DC5Daniel explained? With the Sensor Ground now ganged with the Secondary Ground.
https://cimg4.ibsrv.net/gimg/www.rx7...cb71726fec.jpg

Originally Posted by DaleClark (Post 12517675)

@MIKE_RX7 DriftinJim makes different harnesses, here's a link to one -

https://www.ebay.com/itm/25455652490...sAAOSw9u9ezv4N

If you look at the store there are many options.

Dale