3SGTE Harness Routing and Lengthening Options

[WannabeGT4]

When you all had your harnesses done, did you re-route the harness to exit on the timing belt side instead of the distributor side or did you just lengthen it and run it behind the intake manifold then through the hole in the firewall on the passenger side?

[jgreening]

When you all had your harnesses done, did you re-route the harness to exit on the timing belt side instead of the distributor side or did you just lengthen it and run it behind the intake manifold then through the hole in the firewall on the passenger side?
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Mine is lengthened and still fits in the stock black plastic box behind the intake manifold. Many people end up removing that when they lengthen it.

[WannabeGT4]

Sorry, I think I phrased my question wrong. You're talking about the black box that is between the head and intake manifold right?
What I was wondering was, did the wiring that enters the cabin get extended then routed between the intake manifold and firewall or was it extended and re-routed so that it didn't even exit on the distributor side of the engine.
Do you have a pic of how yours is set up?
I'll be doing my harness my self and just wasn't sure how most people did it. Thanks.

This post has been edited by WannabeGT4: Oct 20, 2005 - 8:50 PM

[jgreening]

You know what, I think I remember that mine is different because it came out of a MR2. IIRC, the wiring harness is on the opposite side so I am probably not much help to you.

[Defgeph]

do one wire at a time
use heat shrink tubing at all soldering points
only lengthen 30 to 40 inches

wrap in electrical tape and wire loom.

Plug in your ECU.
Should take about 2 to 3 hours.

DEF

[lagos]

i cut a hole right behind my ecu so that i wouldnt have to extend the harness. worked out well

[WannabeGT4]

do one wire at a time
use heat shrink tubing at all soldering points
only lengthen 30 to 40 inches

wrap in electrical tape and wire loom.

Plug in your ECU.
Should take about 2 to 3 hours.

DEF
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Thanks def, but which way did you run the harness? From the Distributor side or the timing belt side?

[Defgeph]

dizzy side.

To many wires to have it routed from the timing belt side. IMO

My harness wraps right around the IM to the stock firewall location, down to the ECU.

DEF

[WannabeGT4]

The 5S harness comes from the timing belt side doesn't it? I figure that I can make up that 30 inches easily by not running it between the intake manifold and head then around between the intake manifold and firewall. I'll just extend the few wires that have to be on the distributor side.

This post has been edited by WannabeGT4: Oct 20, 2005 - 9:23 PM

[Defgeph]

Makes sense. But It might clutter up your engine bay. Having a few wires go here, a few there, some around over here, some down there.

Or one nice, neat, chunky wireloom going into ur firewall down to your ecu.

Its up to you. I know how you feel about extending the harness, its a pita. You just gotta jump in and do it. before you know it, you'll be done.

Do what you think is best.
good luck man
DEF

[lagos]

The 5S harness comes from the timing belt side doesn't it? I figure that I can make up that 30 inches easily by not running it between the intake manifold and head then around between the intake manifold and firewall. I'll just extend the few wires that have to be on the distributor side.
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are u talking about trying to run the harnes in on the drivers side of the car?

[Rjb23]

Lengthening it 30 or so inches is gonna take way longer than 2 or 3 hours. It took me 8 hours to do one side of the wires, and another 8 to do the other. Its not an easy job.

[Defgeph]

I did it in 2 1/2 hours by myself.
I know its not easy.

[lagos]

jeff, when you did yours... did you just use the spare wiring from your 7a harness for the extension?

[Defgeph]

jeff, when you did yours... did you just use the spare wiring from your 7a harness for the extension?
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I used wire from radio shack

[WannabeGT4]

Makes sense. But It might clutter up your engine bay. Having a few wires go here, a few there, some around over here, some down there.
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are u talking about trying to run the harnes in on the drivers side of the car?
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Sorry. I guess it's a little difficult to explain what I'm thinking. I'll try again.

Instead of lengthening every wire that enters the cabin because the harness is wrapped around the intake manifold, I'm going to change the route the wires travel in effect turning it into a LHD 3SGTE Harness. Only the wires that have sensors on the distributor side of the engine will be routed between the intake manifold and head. The harness will still enter in the factory 6th gen location.
I'll just take a bunch of pictures and do a little how-to when ever I do this maybe that'll make more sense than trying to explain it all.

This post has been edited by WannabeGT4: Oct 21, 2005 - 8:44 AM

[Defgeph]

there is not that much room to have all those wires traveling between the IM and the head.

[WannabeGT4]

???

It looks like there is plenty of room to me.

[Defgeph]

Again its up to you. There is alot of heat in that area, it would worry me to run every wire through that location.

[WannabeGT4]

Thanks every one for the input. You've all been very helpful.