3SGTE Harness Routing and Lengthening Options

[lagos]

WannabeGT4

ahh i know what you mean... i dont think youll be able to do it tho. its kind of hard to explain, but a lot of those wires Y off into different placed on the drivers side. so you still have to run them there, and then come back behind the intake manifold and make them all longer... youll see when you start doing it.

[WannabeGT4]

I think I can get it to work. I'll just lengthen the wires that have to go on that side. I should have added that when I said "Only the wires that have sensors on the distributor side of the engine will be routed between the intake manifold and head." If I get the harness apart and realise that this just isn't going to happen no big deal. I'll just put it back together and lengthen it the way def did it.

This post has been edited by WannabeGT4: Oct 21, 2005 - 1:43 PM

[Dr_Tweak]

I did a 3SGTE/ST harness for someone yesterday and was doing some thinking. The 3SGTE harness is actually just as long as the stock USDM Celica harness, but the wiring is routed the wrong way coming from the injector side of the engine. It wouldn't be that difficult to cut open all that looming, route the wiring out the back of it, and have a very clean harness that didn't need to be extended at all.

That probably doesn't make any sense unless you've compared these harnesses side by side, then you probably know exactly what I'm talking about

[WannabeGT4]

I did a 3SGTE/ST harness for someone yesterday and was doing some thinking. The 3SGTE harness is actually just as long as the stock USDM Celica harness, but the wiring is routed the wrong way coming from the injector side of the engine. It wouldn't be that difficult to cut open all that looming, route the wiring out the back of it, and have a very clean harness that didn't need to be extended at all.

That probably doesn't make any sense unless you've compared these harnesses side by side, then you probably know exactly what I'm talking about
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I haven't had them side by side but it makes perfect sense to me.

[scothaniel]

It wouldn't be that difficult to cut open all that looming, route the wiring out the back of it, and have a very clean harness that didn't need to be extended at all.

I did something like that with my harness. You still have to cut and extend a bunch of wires - since the length of the wires are relative to the harness routing.

For example, the 4th injector plug on the JDM harness has the least amount of wire, since the harness enters from the right (when facing the motor)
On the US harnesses, the 1st injector plug has the least wire , since the harness enters from the left.

I have been enable to route the 3rd gen 3SGE wiring into a 6th gen without having to extend the ECU/Dash plugs. You still have to extend the ignitor, coil, CCO and VISC wires, but thats nothing in comparison. Now if only these harnesses were easy to get!

Oh, and I highly recommend running the wires behind the intake manifold instead of through it. Nothing like having to pull the IC, TB, and valve cover to get the wiring harness out - or to get to the injectrors.

Scott
90 All-Trac+
96 Celica +
Michigan

This post has been edited by scothaniel: Nov 1, 2005 - 11:09 AM

[Dr_Tweak]

Yes, that's exactly right, since it's sequential injection it wouldn't run right unless you moved the injector plugs around so one would have to be careful to get that right. But yeah I think this is a much better option to extending the whole harness.

-Doc

[scothaniel]

Well, that was just one example. Nearly all the wires will be the same way as the injectors, except the components on the left side of the harness ( Map sensor, alternator, A/C ). Everything on the center / right side will need to be extended.

Scott
90 All-Trac +
96 Celica +
Michigan