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98 GSX Time Trial build

gsxitement

15+ Year Contributor
1,673
1,055
Dec 9, 2002
DOBBS FERRY, New_York
I understand what you are aiming at but I would highly recommend you do not leave those loops in the harness. You are inducing chaffing into the harness wires as well as TOO much relief. Plus there is no way to cover the plug for moisture protection. This build up would not meet military OR aviation mil spec build ups standards. As far as repairs etc there are standards for that as well as far as a splice down line and others. I know it sounds silly but just google Mil Spec Harness or Ohm Racing build ups and you will never see anything like these pig tails. Just my input and advice since you asked for it earlier LOL.
Not going for a mil or aviation style harness. Just something that will fit my needs on the track in the capacity that I race. Mostly just wanted to clean up the engine bay since I just wanted to. As for moisture protection, the bulkhead will have a raychem shrink boot, I’m not too worried about moisture. My car sees the track 3 and 4 laps at a time and seldomly in the rain. I’m confident that for my personal car, this will be just fine. Also my first ever harness, after 25+ years of being a mechanic LOL, so I’m taking my time and learn as I go. Appreciate the input.
 

gsxitement

15+ Year Contributor
1,673
1,055
Dec 9, 2002
DOBBS FERRY, New_York
Interesting, yeah I looked up a few more auto motorsports harnesses and did see they do something similar as well... I have absolutely no idea why they do this and could not find anything supporting it on any websites either other than its "easier" in the future LOL. Learned something new today that is for sure... I personally would never do anything like this and there is a reason when quality is needed over "easier" it is not done that way but, hey, that is just me. Build it once the correct way and you would never need to re-pin it from the damage these tight bends can induce. Glad this was brought up though as I had no idea automotive mil spec had deviated so much from actual design of these connectors and wires.
It’s mostly for ease of installation of engine at the race track. My personal take was just to make the engine bay cleaner and lose some weight in the front of the car. You should check out @racespec on IG. And HP Academy has some really good podcast episodes going in depth with motorsport harness builders. Really, really good info. You should check it out.
 

Justin DuBois

Proven Member
961
757
Aug 15, 2019
Oakland, California
When the day comes that the wiring becomes a liability, a new engine wiring harness built with mil-spec technology would be excellent. For me its not about the weight, its about reliability.

We lost an engine due to a weak injector connection in a 1G while at Willow springs. We lost a night/day and had to skip Sonoma raceway. The team was trying to put me in the seat of a RX7 for the track time - but it turned out better not to, as I was battling sleep deprivation and fatigue.
The yellow top thats now in my 2G was the spare motor we brought with us as a backup. Our 4 man team managed to get the swap done, and get us back on the next track at Button-willow.

Epic thrash.

Long story long - wires are important.
 

gsxitement

15+ Year Contributor
1,673
1,055
Dec 9, 2002
DOBBS FERRY, New_York
When the day comes that the wiring becomes a liability, a new engine wiring harness built with mil-spec technology would be excellent. For me its not about the weight, its about reliability.

We lost an engine due to a weak injector connection in a 1G while at Willow springs. We lost a night/day and had to skip Sonoma raceway. The team was trying to put me in the seat of a RX7 for the track time - but it turned out better not to, as I was battling sleep deprivation and fatigue.
The yellow top thats now in my 2G was the spare motor we brought with us as a backup. Our 4 man team managed to get the swap done, and get us back on the next track at Button-willow.

Epic thrash.

Long story long - wires are important.
Obvs the wiring is important. That’s why I’m taking my time and doing it as best I can with what I have and on as much as budget I can. I plan on building another one when I build the new motor next off season. Glad you guys got it fixed and out there.
 

gsxitement

15+ Year Contributor
1,673
1,055
Dec 9, 2002
DOBBS FERRY, New_York
Jelly - love the work. Keep the details comming
I appreciate your experience and input. I just got a raychem shrink tube assortment. Just trying to learn as much as I can. Then when I have a little more budget, I can use this one as a template to do a full on motorsport style harness with concentric twists and all the good stuff. This is essentially a prototype and R&D.
 

Cutlassjim

15+ Year Contributor
184
12
Dec 1, 2005
Berlin, Massachusetts
Interesting, yeah I looked up a few more auto motorsports harnesses and did see they do something similar as well... I have absolutely no idea why they do this and could not find anything supporting it on any websites either other than its "easier" in the future LOL. Learned something new today that is for sure... I personally would never do anything like this and there is a reason when quality is needed over "easier" it is not done that way but, hey, that is just me. Build it once the correct way and you would never need to re-pin it from the damage these tight bends can induce. Glad this was brought up though as I had no idea automotive mil spec had deviated so much from actual design of these connectors and wires.


At my last job we made literal aviation/MIL-spec harnesses and cabling with those D38999 connectors and you %100 do this. The allowed bend radius on the 18-22 AWG (We used M22759/11) wire used in these is that small. It's still like 5x the diameter of the wire. You don't trash a $10K harness in the middle of the desert because you bent one pin and you don't have the 1/8" of extra wire you need to re-crimp it.
 
Last edited:

gsxitement

15+ Year Contributor
1,673
1,055
Dec 9, 2002
DOBBS FERRY, New_York
At my last job we made literal aviation/MIL-spec harnesses and cabling with those D38999 connectors and you %100 do this. The allowed bend radius on the 18-22 AWG (We used M22759/11) wire used in these is that small. It's still like 5x the diameter of the wire. You don't trash a $10K harness in the middle of the desert because you bent one pin and you don't have the 1/8" of extra wire you need to re-crimp it.
And something that gets thrown around a lot in regards to motorsport harnesses is “MILspec”. When you look at what it takes for a harness to be considered MILspec, it’s not something that’s going to be done in someone’s garage at home, or even some harness shops. The level of assembly and testing for those MILspec harnesses is intense. I’m just trying to make sure my 3 lap killer has a good harness, save some weight, look neater and more professional and make sure the cars reliable. That’s it really LOL.
 

Dusty Landrum

Supporting VIP
579
567
Jul 15, 2019
Denver, Colorado
At my last job we made literal aviation/MIL-spec harnesses and cabling with those D38999 connectors and you %100 do this. The allowed bend radius on the 18-22 AWG (We used M22759/11) wire used in these is that small. It's still like 5x the diameter of the wire. You don't trash a $10K harness in the middle of the desert because you bent one pin and you don't have the 1/8" of extra wire you need to re-crimp it.
Lol of course you don’t, that is why there is a wire repair manual that provides repairs for pins wires etc LOL. Don’t tell me the company you worked for because I would never want to fly on that aircraft ever again if I knew. But we are jacking this guys thread and he is right, if he builds it just for a lap car it’s up to him, it’s not going to the moon as they say. Not building F35 jets here. Looking good on the build dude! Are you going to maybe bring it to shoot out by chance?
 

gsxitement

15+ Year Contributor
1,673
1,055
Dec 9, 2002
DOBBS FERRY, New_York
Lol of course you don’t, that is why there is a wire repair manual that provides repairs for pins wires etc LOL. Don’t tell me the company you worked for because I would never want to fly on that aircraft ever again if I knew. But we are jacking this guys thread and he is right, if he builds it just for a lap car it’s up to him, it’s not going to the moon as they say. Not building F35 jets here. Looking good on the build dude! Are you going to maybe bring it to shoot out by chance?
We’ll see. I feel ashamed to say that in the 22 years of ownership of the car, I’ve never been to Shootout. Maybe next year. We’ll see.
 

Dusty Landrum

Supporting VIP
579
567
Jul 15, 2019
Denver, Colorado
We’ll see. I feel ashamed to say that in the 22 years of ownership of the car, I’ve never been to Shootout. Maybe next year. We’ll see.
Don’t sweat it, last year was my first year and I am hooked now though. You will love it dude.
 

Cutlassjim

15+ Year Contributor
184
12
Dec 1, 2005
Berlin, Massachusetts
Lol of course you don’t, that is why there is a wire repair manual that provides repairs for pins wires etc LOL. Don’t tell me the company you worked for because I would never want to fly on that aircraft ever again if I knew. But we are jacking this guys thread and he is right, if he builds it just for a lap car it’s up to him, it’s not going to the moon as they say. Not building F35 jets here. Looking good on the build dude! Are you going to maybe bring it to shoot out by chance?

Oh the manual must include the additional wire length you need to replace a pin, got it. Funny you should mention F35's that what the harnesses were going in. :)
 
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