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Cutting/Extending Wiring Harness

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Old Dec 17, 2008 | 02:49 PM
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Cutting/Extending Wiring Harness

In the next week or two I plan on taking off my intake manifold and throttle body to swap in ported units. While all that junk is off I wanted to start my wire tuck there and work my way outward to the entire engine bay. My question is, has anyone ran into problems cutting and elongating sensor wires/wiring harness' (injectors, MAF ect...). I dont forsee any problems doing so as Ill be using the same gauge wire and using heat shrink on everything to make everything weather tight. Has anyone heard/expirenced problems with voltage/current getting screwed up by doing this? Dont want to go through all this work and have my car on the fritz after.. Thanks. I made the search button my b!tch also and couldnt come up with anything.
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Old Dec 17, 2008 | 06:08 PM
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I would say that if you are not 100% sure about it than pay someone to do the wiring for you. I would personally not mess with wiring for such important components.
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Old Dec 17, 2008 | 07:04 PM
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I am assuming you owned a Honda before since you want to tuck.

If you have any uncertainty that you cannot do it, I would not.

If you decide to anyway, get a pad of paper and a pen and color coordinate the wires that you cut. Go one sensor at a time and pre measure the wire before you cut it. You should be golden. Obviously, make sure you do it right the first time and solder, heat shrink, than tape. Look at spending around 5-6 hours.


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GL.
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Old Dec 17, 2008 | 09:53 PM
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By extending wiring you're adding resistance which will throw off your sensors off a little bit. Enough to make a difference? Probably not, but it's still a reality. If you're looking to push performance to the edge, don't do it. If you don't care about performance, but how your **** looks, then have at it.
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Old Dec 18, 2008 | 04:10 AM
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Originally Posted by revvin9k
I am assuming you owned a Honda before since you want to tuck.

If you have any uncertainty that you cannot do it, I would not.

If you decide to anyway, get a pad of paper and a pen and color coordinate the wires that you cut. Go one sensor at a time and pre measure the wire before you cut it. You should be golden. Obviously, make sure you do it right the first time and solder, heat shrink, than tape. Look at spending around 5-6 hours.
GL.

Haha, you hit the nail on the head with that one! Thats exactly what I'm looking to do, hide away some of the mess on the top of the motor. I'm 100% confident doing all this as ive done many other similar projects, and done auto electrical work before. Basically I was looking to see if anyone had already done this and not had any problems before I get crazy with the wire cutters. lol

Originally Posted by biggie5252
By extending wiring you're adding resistance which will throw off your sensors off a little bit. Enough to make a difference? Probably not, but it's still a reality. If you're looking to push performance to the edge, don't do it. If you don't care about performance, but how your **** looks, then have at it.
I dont plan on ever really pushing the performance edge with my car, I currently have 400awhp and I'm plenty happy with that and will only be doing suspension/exterior work now. Since I dont plan on doing any more motor work this is why this project is next up on my list. You make a good point with the extra resistance, which is why I asked this question to begin with. Want to get everyone opinion before I do anything. Thanks
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Old Dec 18, 2008 | 04:15 AM
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Originally Posted by biggie5252
By extending wiring you're adding resistance which will throw off your sensors off a little bit. Enough to make a difference? Probably not, but it's still a reality. If you're looking to push performance to the edge, don't do it. If you don't care about performance, but how your **** looks, then have at it.
Have not had one issue with my tuck.
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Old Dec 18, 2008 | 05:05 AM
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I have not had any issues with my tuck. There are quite a few wires to extend depending on how you do it, and route the wires.

If I had to do it all over again, I would do it very different than how it is done now.

I would break out all the sensor wires out of the harness, all the way to the large boot that passes through the firewall, and route everthing from there (ie. branching out from that boot). If you branch out from that boot, then you are only shortening all the wires, because it would eliminate the sensor wires from being routed from the passenger side of the firewall, over to the drivers side, then forward to the breakout points.) But, doing it that way it would be 10x easier with just the block and a bare head in the car so that you can move around easily, and get to that boot.

Don't be intimidated, it's really not that hard. It just takes time and patience.
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Old Dec 18, 2008 | 05:34 AM
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Originally Posted by tkklemann
I have not had any issues with my tuck. There are quite a few wires to extend depending on how you do it, and route the wires.

If I had to do it all over again, I would do it very different than how it is done now.

I would break out all the sensor wires out of the harness, all the way to the large boot that passes through the firewall, and route everthing from there (ie. branching out from that boot). If you branch out from that boot, then you are only shortening all the wires, because it would eliminate the sensor wires from being routed from the passenger side of the firewall, over to the drivers side, then forward to the breakout points.) But, doing it that way it would be 10x easier with just the block and a bare head in the car so that you can move around easily, and get to that boot.

Don't be intimidated, it's really not that hard. It just takes time and patience.

I never though of going that route, and it actually sounds like a good idea. I suppose if i start disconnecting all the sensors and labeling each to where it goes, then undoing all the factory wire loom and starting right at the firewall route the wires directly to where they have to go and then re applying wire loom/elec. tape to make it neat it will cut out all the pointless here there and everywhere routing they do from the factory. I have access to Deutsch connectors and crimping/removal tools to put it right back to factory plugs so that wont be a problem. Thats prob the best idea, its gonna take alot more time but I have all winter to work on it. lol. You guys dont have any pics of your tucks do you? I would love to see some finished/work in progress pics for a little inspiration.
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Old Dec 18, 2008 | 05:35 AM
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I know one of the local guys moved the harness that rides along the back of the valve cover under the IM. I am going to see if i can do that when i get the new intake mani back in. That is about the extend that i care about it.
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Old Dec 18, 2008 | 07:01 AM
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Originally Posted by MR Turco
I know one of the local guys moved the harness that rides along the back of the valve cover under the IM. I am going to see if i can do that when i get the new intake mani back in. That is about the extend that i care about it.
Yeah I had though about doing something quick like that too, but I know when I do that and see how good it looks with the wiring hidden i'm going to want everything else to look the same.lol. Im way to picky when it comes to the car... it gives me something to do too see were supposed to get 12" of snow tomm.
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Old Dec 18, 2008 | 07:10 AM
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Originally Posted by EvoooB
Yeah I had though about doing something quick like that too, but I know when I do that and see how good it looks with the wiring hidden i'm going to want everything else to look the same.lol. Im way to picky when it comes to the car... it gives me something to do too see were supposed to get 12" of snow tomm.
hahaha srsly. I have some little stuff to get done before i get the IM manifold back from PPI. I am pretty stoked to get the car back together though.

As for the wiring the harness behind valve cover is really the only eye sore i can think of. Otherwise the wiring next to the battery near the fuse box is the only other group of wiring i can think of and it isn't too bad since it HAS to be there. I will have to take a look tonight.
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Old Dec 18, 2008 | 07:36 AM
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Originally Posted by MR Turco
hahaha srsly. I have some little stuff to get done before i get the IM manifold back from PPI. I am pretty stoked to get the car back together though.

As for the wiring the harness behind valve cover is really the only eye sore i can think of. Otherwise the wiring next to the battery near the fuse box is the only other group of wiring i can think of and it isn't too bad since it HAS to be there. I will have to take a look tonight.

Yeah, the stuff behind the valve cover kills me. I have already done some small stuff around the fuse box, but I'll be redesigning that mess now. Theres a few misc sensors up front also like the water temp sensor in the thermostat, I think the came angle sensor wires are over there. I have to get some stuff apart first then I can figure out exactly what I want to do. Prob want to clean up some of the vaccum lines too.

PPI does some great work, I had them port and coat my exh. manifold and hotside. Awsome work and great to deal with too. You doing the throttle body too?
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