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> 914 GT 3.6 Ferrari Build, - Wiring underway!
tygaboy
post Mar 6 2025, 10:52 PM
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Engine harness Version 1 is nearly done and will be used to get the car running and dialed in. But those of you who know me know Version 2 can't be far behind. And it's not.
So, here I go: my first time building a full motorsport-level, concentric twist harness.
There are a host of formulas, measurements and general best-practices that need to be followed and they take 4-5 times as long to build as a conventional harness.
Today I started by constructing a test section that helps validate the design. This is only the core and initial layer. Pretty, no? (IMG:style_emoticons/default/wub.gif)

I'll be covering all the details of this effort in episodes At The Red Barn and posting occasional pics here. I'm really excited to try my hand at this.


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Cairo94507
post Mar 7 2025, 07:58 AM
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That is pretty; can't wait to see this progress. (IMG:style_emoticons/default/beerchug.gif)
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tygaboy
post Mar 24 2025, 08:34 AM
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The latest update:

https://www.youtube.com/watch?v=7vRsBe4UW5E
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JeffBowlsby
post Mar 24 2025, 09:01 AM
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Why the concentric twist? Have not seen that before.
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tygaboy
post Mar 24 2025, 09:51 AM
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QUOTE(JeffBowlsby @ Mar 24 2025, 08:01 AM) *

Why the concentric twist? Have not seen that before.

@JeffBowlsby Jeff- there's a bunch of info available but in short, with this approach, the harness is as small as possible (due to the type of wire used), remains very flexible, it keeps everything neat and tidy and ensures none of the wires in the harness see more stress than others.
There are "service loops" (pictured) at the connectors to facilitate repair if that's ever needed.
Also, the entire harness is sealed - every connector is booted, every branch point epoxied and strain relieved. No exposed conductors anywhere. (also pictured)
Yes, it's totally unnecessary for what I'm up to with a street car. But as the saying goes:
There's no kill like overkill!


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davep
post Mar 24 2025, 07:31 PM
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But how much does the concentric twist shorten the harness or did you add the extra length in to start with?
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bkrantz
post Mar 24 2025, 07:41 PM
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QUOTE(davep @ Mar 24 2025, 06:31 PM) *

But how much does the concentric twist shorten the harness or did you add the extra length in to start with?


That's my question. A straight wire is the shortest route, right?

But way cool.
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tygaboy
post Mar 24 2025, 08:51 PM
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@davep @bkrantz A concentric twist harness is built to the same dimension since it still has to connect to everything, but uses 15-20% more wire length. The twist and service loops takes some length and, depending on the branching approach, some extra length is used there, too.
But the wire that's typically used (Tefzel M22759/32) is smaller diameter and lighter, due to the type of insulation is uses.
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bkrantz
post Mar 25 2025, 07:18 PM
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QUOTE(tygaboy @ Mar 24 2025, 07:51 PM) *

@davep @bkrantz A concentric twist harness is built to the same dimension since it still has to connect to everything, but uses 15-20% more wire length. The twist and service loops takes some length and, depending on the branching approach, some extra length is used there, too.
But the wire that's typically used (Tefzel M22759/32) is smaller diameter and lighter, due to the type of insulation is uses.


And cool.
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tygaboy
post Mar 29 2025, 06:59 AM
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Enough with the wiring! Well, at least for a bit. Let's work on the cooling system and learn about what NOT to do when welding aluminum. (IMG:style_emoticons/default/wacko.gif)

https://www.youtube.com/watch?v=GsExTNbnSNQ
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Cairo94507
post Mar 29 2025, 07:22 AM
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Getting close to turning the key.... (IMG:style_emoticons/default/beerchug.gif)
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East coaster
post Mar 29 2025, 09:36 AM
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Nice progress! I’ve done the stainless rod mistake and it’s a mess when it happens.
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Superhawk996
post Mar 29 2025, 10:59 AM
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Always impressed with your craftsmanship on the wiring. (IMG:style_emoticons/default/first.gif) Attached Image
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tygaboy
post Mar 30 2025, 08:59 AM
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QUOTE(Superhawk996 @ Mar 29 2025, 09:59 AM) *

Always impressed with your craftsmanship on the wiring. (IMG:style_emoticons/default/first.gif) Attached Image

@Superhawk996 - To be clear, that's an example of what I'm attempting but that's NOT my work! I aspire to that level of result but we'll have to wait to see how close I can get!
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Superhawk996
post Mar 30 2025, 11:05 AM
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QUOTE(tygaboy @ Mar 30 2025, 10:59 AM) *


@Superhawk996 - To be clear, that's an example of what I'm attempting but that's NOT my work! I aspire to that level of result but we'll have to wait to see how close I can get!

(IMG:style_emoticons/default/laugh.gif) Appreciate the honesty! Based on the photo of your twisting work and what I’ve seen of your wiring on the V8, I assumed that was your work. I have no doubt you’ll pull it off!
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Dion
post Apr 3 2025, 07:15 AM
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Loving the videos on the YouTube! Have to say I’m always learning something.
The Tig worked out in the end. (IMG:style_emoticons/default/biggrin.gif)
Look forward to more Chris.
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tygaboy
post Apr 6 2025, 08:17 AM
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The coolant plumbing is coming along:

https://www.youtube.com/watch?v=hvvDfRKGELc
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Cairo94507
post Apr 6 2025, 09:23 AM
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I really enjoy the videos; Chris takes the time to explain everything as he walks us through his plan from beginning to end. (IMG:style_emoticons/default/beerchug.gif)
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tygaboy
post Apr 12 2025, 07:52 AM
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More stuff getting done means less left to do before I try and start this thing!

https://www.youtube.com/watch?v=yiQ9OoCeNUU
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ConeDodger
post Apr 12 2025, 08:02 AM
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QUOTE(tygaboy @ Mar 24 2025, 11:51 PM) *

@davep @bkrantz A concentric twist harness is built to the same dimension since it still has to connect to everything, but uses 15-20% more wire length. The twist and service loops takes some length and, depending on the branching approach, some extra length is used there, too.
But the wire that's typically used (Tefzel M22759/32) is smaller diameter and lighter, due to the type of insulation is uses.


If you used Tefzel that harness is likely more expensive than my car was when I bought it!

I see signs that someone took the High Performance Academy Motorsports wiring course?
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