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shielded wire termination

EFI Wiring Fundamentals

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Discussion and questions related to the course Motorsport Wiring Fundamentals

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Hey guys,

I was watching the Panhard videos, and would be really interested if you could give some tips and images on how you terminate the shielded portion of the wire to the ecu sensor ground.

I see you used four shielded lines and this can become a real challenge getting the four shield bundles all back to a single pin on the ecu an I would be keen on some example crimp fittings and how you collected everything up.



Im surprised no one has answered your question! There are actually a couple of way this could be handled since basic engines nowadays need at least 4 shields (2 cams, 1 crank, 1 knock).

The most normal way is a splice. I don't have any pics since splices are pretty boring to look at it comparatively to some contra-helical twisting lol But when you have 1, 2, 3, 4, even 6 shields, you can chain the shields to together (pic attached). This turns all your shields drains into one nice compact wire ready to be added to your ecu ground.

When it comes to pinning into an ecu, I stick to one wire per pin, so you would still need to splice the wire with the grounds before the ecu connector.

This pic is from an old harness I did. I don't care for solder sleeves that have a wire already a part of it, I don't really think they would help other than it being slightly more convenient but with an added cost.

Hope that helped

Attached Files

Another question regarding shielded wires, how do you treat the shields when you pass them through a bulkhead fitting? Each shield with it's own separate pin that is connected to the shield on both sides of the bulkhead, or do you aggregate them back to a single pin and then either connect that to a 0v at the bulkhead fitting or connect them back to the matching shields on the other side of the bulkhead.

Hmmm i may have read your question wrong but I believe this should answer it

With the shields, I chain them into one single wire (see pic I posted earlier). With that wire from the engine side I pass it through the bulkhead into the cabin side where it mates with the other chained set of shields. Then I again chain the shields at the ecu to one single wire and splice it to a 0v.

So for one harness, I chain 3 times, with each time it leads to one single wire. For a regular build with 4 shields, be sure to have 12 solder sleeves ready

Hi Ryan,

You read my question correctly, I had designed the new loom that I am doing to have a single connection through the bulkhead for the shields and then expanding them out again, but I had one of the electrical engineers that I know telling me that they have to remain separate all the way through so that they do not get any crosstalk. I can understand that that is probably the technically correct way of doing so, but considering that to do that I would need to purchase another bulkhead connector to fit all of the wires in, then I am happy to do the chains and risk a small amount of potential cross talk.

can you run your sync and reference (trigger and home) in one multi strand shielded wire?

so I have a reluctor sensor on my cam and crank, can I run their 4 wires in one four core shielded wire? instead having two twin core shielded wires?

@BlackRex I have not had any issue with crosstalk between shields even in higher horsepower applications. I will see if I can find the documentation regarding the "daisy chain shielding" technique. But I will say, I only use a chain technique with hall sensors. I do not use it with mag/vr sensors (no idea if it matters with these sensors, i just take a precaution to it). I just started my undergrad classes in electrical engineering so maybe I will see this topic come up in class one day lol but in practice, it has never been an issue with my clients and their tuners

@Josh2703 To my knowledge, I am not aware if this would cause issues. That being said, I would not do it. I'm not a fan of VR sensors due to their interference happy signals at high horsepower. For your car, I would run individual shielded wires separately to each sensor, and a single drain (no chain) to the ground at the ecu. Plus I'm not sure how you run the single 4shield cable to both sensors without removing most of the shield on the longer set of wires

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