Another MK3 1jz swap. The dreaded wiring harness!

[supbrah86.5]

So I'm new to this forum, so I'll do my best to not shit it up!

I currently have an 86.5 and recently got a 1jz from an mk3 supra via Tigerjapan. To start, my opinion on tiger: They are very helpful with questions you might have with purchasing parts and whatnot from Japan through Canada. However! Once the package has been delivered, they no longer give a shit about you. You can only expect so much. I ordered a 1jz and R154 combo from them. They give you the option to purchase the ECU and/or wiring harness at purchase. Each costs $150.00 USD. I called and asked hey, since I have a wiring harness, should I even buy one? The rep told me since you're going to have to modify it anyway, don't worry about it. Sweet. About a week and a half later, the package arrived. I was in the hospital and was unable to sign for the delivery, but luckily I had a tennant here to sign. Unfortunately, whoever the shipper was, they were dicks to my poor tennant and said, "who's gonna sign for this hunk of shit?" I guess he had a bad day. But anyway, they sent me a wiring harness anyway! I wonder if I opted out of the ecu they would have sent me that too? They said on the site that it could have anywhere from 30-40 thousand miles on the motor. It looks pretty good, a bit of crud underneath the valve covers, but that's to be expected. Of course I broke both of the vent hoses. There's a lot of broken, cut wires and hardlines that I have to figure out what they are. I'm new at this but honestly, it's not that hard I'll figure it all out.

So here's a parts list of what I've purchased(so far driftmotion is where it's at):

pre 89 brackets
polyurethane square mounts
2jz throttle cable
2jz water pump
no name "bolt-on" intercooler kit with knockoff hks blowoff- gonna use the blowoff until funds tighten up- note: not bolt-on
lsd from 7m-gte
1jz coolant hoses

suspension for giggles:
H&R race springs
Bilsteing HD shocks

Apparently this is a more desirable setup than coilovers. Who knows? All I know is I really enjoy the handling and ride comfortability. Wheel clearance is an issue with the MK4 turbo wheels- going to go with a 40 profile tire opposed to a 45.

My plan is to go without AC and without power steering for simplicity's sake. All I need now is some honest-to-god how-to on how to: 1. Lengthen and make my wiring harness work with my 86.5 NA supra body and 2. how to adapt the fuel lines.

Since I am not really experienced in wiring, I'd like to hear from someone who has done this exact swap. I know the older mk3 isn't as popular for a 1jz swap, but the car is way to clean to pass up for a busted 89. Pictures coming soon, I swear! So hook me up with some input folks! Also I have a 7m-ge and W-58(literally a solid as fuck trans) that I'm willing to part out. I'm in MD.

 

[hvyman]

You can either lengthen it or cut a hole in the firewall and have it run in the dash. I cut the hole. Looks cleaner and less head aches involved with lengthening.

If you lengthen it need to take the stuff around the wires off and do 1 wire at a time and add about 1 foot of wire to each one. Should do it in difference places so the harness doesn't get all ballooned in 2 places.

Knock sensors will have to be rewired and all 1 section of wire and anything else that us shielded wire.
Can remove any wires to anything you don't use like ac trac hydrofan.

The fuel lines bolt right up.

 

[IBoughtASupra]

Click on the JZ link in my signature, you will be very happy.

 

[Mr Bojangles]

^+1 That thread in his signature has helped me get through this 2J swap with a lot less headache. When my swap is done I'm sending you a case of booze!

 

[supbrah86.5]

Thanks for the feedback so far! Some more questions of course!

to hvyman: Where are you saying to cut the hole? What should I worry about destroying behind? Also, could you or anyone be more specific on what all needs to be rewired? I'm actually having trouble figuring out what a few things actually are.

to Iboughtasupra: I've kept the thread in your sig open in firefox for a couple months! The only thing is is Tweak wants like 540 bucks to fabricate a harness with my 7m and 1j harness, not including the body plugs. Hmmmmmm. Could anyone point me in the right direction for like an actual step by step instructions on what to do? Also where the hell is the stock ecu? I have the glovebox out and am stuck on a roof plate of plastic with a screw in the middle that wont come out. is it there somewhere?

Two more questions! for now...

1. How bad is running without power steering? I was hoping to avoid some cash and pain with the reservoir and lines that need to be replaced. I can handle stiff, I just dont want to get stuck in a stupid situation.

2. I currently have a set of MKIV TT wheels being powder coated satin black. I had some clearance issues, in the front wheel well not with the fender lip, with the H&R race springs as well as clearing the spring perches in the rear. Anyone have a good/cheap spacer product out there and tire sizes that worked?

*bonus question* anyone in the southern maryland area want to come to saint leonard and hang out and drink some beer as well as provide me with some knowledge/pair of hands? I'm looking at you, Wes Howe.

 

[IBoughtASupra]

to hvyman: Where are you saying to cut the hole? What should I worry about destroying behind? Also, could you or anyone be more specific on what all needs to be rewired? I'm actually having trouble figuring out what a few things actually are.

Go to my build thread, I have pictures in there of where to cut.

to Iboughtasupra: I've kept the thread in your sig open in firefox for a couple months! The only thing is is Tweak wants like 540 bucks to fabricate a harness with my 7m and 1j harness, not including the body plugs. Hmmmmmm. Could anyone point me in the right direction for like an actual step by step instructions on what to do? Also where the hell is the stock ecu? I have the glovebox out and am stuck on a roof plate of plastic with a screw in the middle that wont come out. is it there somewhere?

The ECU is behind that cover, you could get a cutting pliers and cut off that center screw if it's stuck. Scroll down and look at the link section, there are MANY MANY diagrams and write ups for wiring the 1JZ to 7M harness yourself. Depin and repin, no need to actually cut the wires.

Two more questions! for now...

1. How bad is running without power steering? I was hoping to avoid some cash and pain with the reservoir and lines that need to be replaced. I can handle stiff, I just dont want to get stuck in a stupid situation.

It is NOT expensive at all, it's only one line you buy from DM. They are the cheapest I have found. You can just modify the stock turbo reservoir to work, it under a 100 bucks to get power steering to work.

I'll never understand why people want to remove it as doing that serves no purpose to a street car, people who think it does are highly retarded and the majority have no plans of ever tracking the car, just drive and go to a meet to show off.

2. I currently have a set of MKIV TT wheels being powder coated satin black. I had some clearance issues, in the front wheel well not with the fender lip, with the H&R race springs as well as clearing the spring perches in the rear. Anyone have a good/cheap spacer product out there and tire sizes that worked?

Was your car ever hit? I know numerous people and one of my old Supras that had Ebinachi springs and Tokicos and they fit the MKIV TT rims fine. What tires are you running?

 

[supbrah86.5]

I'll keep looking then. I just need to grow a pair I guess. I just don't want to rush it. As far as the reservoir, it's an NA 86.5 supra so I dont have any 7mgte parts that might be useful. The reservoir I do have does need to be replaced. I have been looking at the fabbed one on Driftmotion. I DO plan on tracking this car so I'll chalk that up to ignorance, I just figured people were going without for a purpose instead of just a clean engine bay. (see hellaflush lol)

The car has never been hit to my knowledge as I'm the third owner and didnt hear or see otherwise. I did however slide sideways across a dirt burm on the backroads being an idiot with stock blown suspension and no lsd. all I did was crackle the paint up on the bumper, knock a foglight out, and really tighten the gap between the front bumper and quarter panels. Got real lucky. No tires on it right now. Both front falken ziex tires 234/45/17 i had(and still have for sale if anyone is interested 95% tread) rubbed the plastic well covers so I pulled them out. They still rubbed up under there on some low dips and tight cornering. The rears were definitely clear however, the spring perches on the Bilstein HDs rubbed the tire down slowly to the threading.

Pics

Stock

I think this was a good color choice.

There are some things on the donor 1j that I have concerns about. I'll just have to post pictures and questions tomorrow in the light.