2JZ MK3 Swap Questions????

[DETONATION666]

Need to make a list and ask questions kinda at the same time 1st my car is a USDM "LHD" 89 Supra Non-Turbo auto. Even though its an 89 It looks like I have an older style crossmember "square mounts" But im looking into a company Bic that makes mounts for the Jzs to fit on the older style crossmembers but what would I have to do as far as the oil pan if I were to go with an aristo or supra 2JZ?
If I wanted to go manual for cheap I have to use the 1JZ bell housing and an R154? What else would I need to go manual? Or would it be ok to keep it auto "might be able to get an auto aristo motor and tranny for cheap" and then switch to manual down the line?
The N/A Non-turbo Mark3s came with like 4:10s or something close would that rear hold up any?? or should I get a turbo rear? Any rear suggestions?
I want to keep twins for a while so I asume ide have to pound out some firewall is it allot does anybody have pics of where to prep that area?

[Norbie]

1. You need a JZA80 Supra sump to clear your crossmember, the Aristo sump won't work.
2. 1JZ bellhousing + flywheel are the only specific parts you need for manual conversion, the rest is the same as a regular MA70 manual conversion.
3. Diff strength won't be a problem but a 4.1:1 ratio isn't well suited to this engine, you'll find 3.7:1 or taller will work better.
4. Yes you will need to massage the firewall for clearance on a LHD car, from memory it's the bulge for the heater core which causes issues but I'm not 100% sure on that. I think there are a few 1JZ MA70's on the iSupra forums so maybe check that out.

[mrshin]

Engine mounts are no big deal - if you're handy with metal you can knock them up yourself, or if someplace local does them that makes it easy too.

You'll need a supra/soarer sump, if you get an engine with a front sump you should have no trouble finding someone willing to swap the front sump for the Supra one - hell, I'm always happy to help there

R154 is the easiest manual option, you'll need the box with JZ bellhousing, gearshift bits, pedals, master+slave cylinder, lines and console. Also buy yourself a decent clutch at the same time.

With the diff, if you've got a 4 pinion LSD G diff then you can trying shimming up the standard LSD and it might do the trick for you, depends how hard you tend to be on it. Otherwise, there's a whole variety of aftermarket diff centres around, also try the 4.1's as a starting point, but if you don't like them, there's plenty of options either direction - all a matter of preference, really.

Not sure about the room around the turbos, I don't think it's too much trouble though, and being wrong-hand-drive you don't have the steering shaft in the way of the exhaust either.

[hamgatan]

as the boys have said above.

however if you want to get off the shelf stuff to do it you need a -

JZA70 Supra or 1990+ MA70 Crossmember (bolts up).
New Rubber/Urethane Mounts obviously.
JZA70 (1JZ) Alloy Engine Brackets - Left and Right
JZA70 Supra R154 and Bellhousing
JZA80 Loom, ECU, Igniter, Etc..
2JZGTE (Duh), but make sure its a Supra one as the Aristo Sumps are different.

And yes I believe Norbies right about the heater thing.. bang that firewall!

[DETONATION666]

1. You need a JZA80 Supra sump to clear your crossmember, the Aristo sump won't work.
2. 1JZ bellhousing + flywheel are the only specific parts you need for manual conversion, the rest is the same as a regular MA70 manual conversion.
3. Diff strength won't be a problem but a 4.1:1 ratio isn't well suited to this engine, you'll find 3.7:1 or taller will work better.
4. Yes you will need to massage the firewall for clearance on a LHD car, from memory it's the bulge for the heater core which causes issues but I'm not 100% sure on that. I think there are a few 1JZ MA70's on the iSupra forums so maybe check that out.

Would a stock 88 Turbo rear be a better choice then?
I think that with 1Js you dont have to touch the firewall its just with the 2js?

[DETONATION666]

as the boys have said above.

however if you want to get off the shelf stuff to do it you need a -

JZA70 Supra or 1990+ MA70 Crossmember (bolts up).
New Rubber/Urethane Mounts obviously.
JZA70 (1JZ) Alloy Engine Brackets - Left and Right
JZA70 Supra R154 and Bellhousing
JZA80 Loom, ECU, Igniter, Etc..
2JZGTE (Duh), but make sure its a Supra one as the Aristo Sumps are different.

And yes I believe Norbies right about the heater thing.. bang that firewall!

Couple of people had said that the earlier crossmembers with the square mounts are stronger than the rounder 89+ I figure that if there arent any sufficient suspension changes and mounts are cheaper than the whole crossmember ill stick with my old one
allthough I doubt ill ever have enough torque to test em lol

Would the 2-peice sumps from supras cost an arm and a leg if i had to go aritso? Ive been having trouble finding a 2jz period here in NY

[Norbie]

Would a stock 88 Turbo rear be a better choice then?

Most likely it would be, yes.

I think that with 1Js you dont have to touch the firewall its just with the 2js?

I thought it was both but I could be wrong, there aren't many LHD Supras around here.

[hamgatan]

Would the 2-peice sumps from supras cost an arm and a leg if i had to go aritso? Ive been having trouble finding a 2jz period here in NY

they might do over there. not sure about US prices. however i seriously suggest you talk to some of the boys on the west coast if you can coz you're more likely to pick one up over there and get it shipped cheap than picking one locally around NY..

i would as a better bet, talk to the bloke who runs rabid chimp performance in seattle.. hes a bit of a mk2 and mk3 performance buff and he'll know exactly where to get one for you if you're hunting for one in the US..

his msn is - [email protected]

[DETONATION666]

Thanks guys I figured Ide ask you guys 1st some of the forums in the US arent nice to people that dont know every detail ha ha

[hamgatan]

yeah elitism sucks. over there its a competition to see whos more JDM than each other yo! *cough*. such elitists also think their B16A civic poo is capable of burning an Iroc Z28 at the next traffic lights.. (lol!)

toymods however utilises the ever friendly spirit of australian 'mateship' on a global scale, so feel free to get your answers here

[DETONATION666]

Anybody know any worth while wiring sites regarding the swap? Im hopeless when it comes to wiring that much but I have this part of me that has to have the motor in my car.

[Big rob]

http://www.supras.nl/index.php?optio...d=34&Itemid=50

[EldarO]

Anybody know any worth while wiring sites regarding the swap? Im hopeless when it comes to wiring that much but I have this part of me that has to have the motor in my car.

wirings the biggest pain in the ass with the conversion, otherwise its just a run-of-the-mill 1J conversion, just a bit bigger.

if you havent got a clue with wiring, have no intention to sit down for a few hours and figure it out, or pay someone to do it for you, i wouldnt bother, alot of people can get the mechanicals sorted in no-time, but get stuck at the wiring.

get a wiring diagram for your car, and a wiring diagram for the motor, and you should be able to figure it out in a few hours, problem is, most diagrams are in japanese!

good luck with the swap, be sure to whack a thread up in members rides so we can all have a look

Elmo.

[Karma Supra]

There is a Build thread currently going on on Suprasonic.

http://www.suprasonic.co.uk/forum/viewtopic.php?t=528 This may be of help to you!

As for the firewall, I believe it only needs "massaging" if you keep the factory twin turbo set up, use a single and it will go right in.

The earlier cross members are no stronger then the later ones, I suspect the confusion has come about the actual engine mounts. The old square ones were very strong, the later fluid filled round ones, tend to fall apart.

You will also need to increase the length of the ECU to Engine Loom/harness for a neat installation on a LHD car.

[Big rob]

Regards to wiring, look at my above link. If there was ever a "Wiring a 2jzgte into an MKIII for dummies" that would be it.