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Discussion Starter · #1 ·
these are some of the things i can think of about the swap into a sc300:
1.extend the wiring harness 2'1" and its best to cut and heatshrink the new solder connections then once finished wrap very tightly wiith electrical tape.DO NOT CUT THE KNOCK SENSOR WIRES.i had the biggest mess with that. they are the bigger brown coaxial wires in the loom. i suggest either running brand new wires or take the wires off your old 2jzge.

2.be prepared to buy new motor mounts. 3 out of 4 broke due to age while taking both motors out

3.when you remove the factory sc airbox you will see a "pop out" for the intercooler piping to route through.there is also a bracket off the clip you need to pull off to mount the factory soarer side-mount. its near the passenger side tow hook on both cars.

4.everything bolts up including the stock exhaust to the 1jzgte downpipe.

5.you will either have to use the soarer throttle cable(which is way to long) or you can buy the mkiv supra throttle cable. the stock cables is inches too short.

6.you can also use the brakes off the clip and rear crossmember. they are 1" bigger rotors and "beefier" calipers

here some websites you can go to.
http://www.1jz-gte.us/
http://www.supraforums.com/ under the mkiii section then 1jz/2jz swap info
http://www.intellexual.net/faq.html

tips for the swap:
its best to unplug the harness from inside the car. unplug the clips from the ecu and there are a couple of clips around there you need to unplug included a blue clip for the airbags(i think, not sure its been a while) thats kinda hard to get to. you will see what im talking about when you try to pull the harness out from the engine bay and it doesnt slide out. i didn't pull the harness off the motor its just more work you dont need to do. after i pulled the 1jz out of the clip and put the motor on a engine stand i pulled the motor next to a table to extend the harness. itsjust easier that way
for a 5-speed car you need to run a wire off the starter to the ignition to bypass the neutral start switch.we were finished with the swap and it wouldnt crank so it took us several hours looking at wiring diagrams to find that the ecu didnt know it was in "park" so it wouldnt turn over.
theres probally alot more to it than this but i cant think of anything else thats difficult. email me with any questions at
[email protected]

good luck and remember there will always be things that come up that you didnt plan spending money on so make sure you have some extra bank before the swap(motor mounts,throttle cable,extra wire,and so on)
 

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so the motor mounts from the soarer (1j) and sc300 (2j) are the same? and you just swap over the soarer ecu along with everything else? i'm thinking about making one of those my next project... and oh yeah, does the car need to already be 5 speed before swapping in 1j, OR how hard is it to convert auto > manual ? either way which tranny works best r154 or is there something else?
 
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Discussion Starter · #6 ·
yes, the sc300 and soarer motor mounts are the same. The supra mounts are slightly taller.

Everything is plug and play as far as connectors go. We had to lengthen a few wires that went to stuff on the opposite side of the engine bay but it wasnt more than a few wires.

My car came with the manual tranny so i just bolted it up to the 1jz and used a 2jzge flywheel and clutch set. So far the tranny is holding up pretty well. 300whp and no problems as of a year and 2 months.you could use the supra 6 speed tranny/clutch but thats some money.
 

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I just spoke with him...and a really cool guy.
I have been speaking with many regarding this swap as there are differences between year make and model.
Soarer to soarer is fairy easy from the looks of it.
VVTI though has more pins utilized....too bad theres no documentation on them.

I can say the orange plug has 3 more pins filled on the VVTI than on the 2zjge plug.
(grey plug) has 11 of 14 pins filled on the VVTI instead of 5 on the 2JZGE plug.
(large whit plug) has 15 of 25 pins filled on the VVTI
(larger grey plug) has 12 of 17 pins filled on the VVTI
im still counting.... and marking differences.
OH.....engine bay fuse box bottom connector connects right in ....but the top connector is different.
VVTI version on that plug has 2 large guage wires vice the 92 body 2jzge which has 2 large gauge and a smaller white wire.

VVTI version has a Throttle control ECU.....
 

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MightyAl said:
you dont have to extend the harness...it reaches quite well behind the dash.
so far testing it and yes it looks pretty good....might have to get rid of the plasitic holder attached to the engine for an extra 3-5 inches.
 

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Madd Tyte JDM yo ®
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dont worry about cutting the knock sensor wires... i would rewire them with USB 2.0 double sheilded cable. itll be better than stock.
 

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the ecu plugs reach....but the other mentioned plugs dont and will need extending.

the other thing i was looking at is the plug on the alternator.....so i tore up the engine bay harnes and one wire goes toward the engine bay fuse box and 2 go back toward the cabin..????????

this really sux......
 

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Thinking Person
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Some people's gauges work, some don't... anyone know why?

I'm also curious if we could get a bit more detailed information on the harness extension regarding the knock sensor setup?
 

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Bean said:
I'm also curious if we could get a bit more detailed information on the harness extension regarding the knock sensor setup?
As am I...

Also, regaurding the factory 1JZ-GTE 5-speed tranny, you would need the front part off the MKIII driveshaft, correct? Can you buy this part from toyota? If so, someone have a part #? Also, does our shifter ass. bolt right into the tranny?

You should have a list of every part and tool needed for a complete swap guide. I think I will make a full photo document of how to do the swap when I do mine within the next few months.
 

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Thinking Person
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RjRacing said:
As am I...

Also, regaurding the factory 1JZ-GTE 5-speed tranny, you would need the front part off the MKIII driveshaft, correct? Can you buy this part from toyota? If so, someone have a part #? Also, does our shifter ass. bolt right into the tranny?

You should have a list of every part and tool needed for a complete swap guide. I think I will make a full photo document of how to do the swap when I do mine within the next few months.
Why would you buy that part from toyota when you can walk into nearly any junkyard and get the whole driveshaft for dirt cheap

I plan on making a documentary of my swap as well... gonna try the video thing too
 

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WilKillya County Sheriff
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Bean said:
Why would you buy that part from toyota when you can walk into nearly any junkyard and get the whole driveshaft for dirt cheap

I plan on making a documentary of my swap as well... gonna try the video thing too
Bean do you have an AIM user name?
 

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Not so boring anymore
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Looking at getting an sc400 for a dd.. and maybe if i ever get any money i dont drop into my supra / the motor blows on the 400 do a 1jz swap... is the wiring the same for the sc300 and sc400?
 
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