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2JZ-GE SWAP INTO MK3 SUPRA

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2jz ge help needed swap w58
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5.3K views 17 replies 8 participants last post by  Wreckless  
L
#1 · (Edited)
I know that that this has been asked a lot on this forumbut I may be illiterate and can't grasp the answer I need.

The reason for this swap is due to my 7M-GE blowing. I have had it rebuilt twice because I got screwed over by two different shops and after both rebuilds the would not insure their failure of work. I would rather swap in a more reliable engine and one that I can have a tiny bit more fun with. I have no plans on power gains as this purely a "show build" but I do have plans of making a track mk3 in the future.

  1. For this swap I know I will need to get new mounting hardware (my supra is an 86.5 so I have to get square brackets and mounts for them).
  2. My supra has a W58 transand I know the R154 is a much better trans but I do not have the budget for that swap since I would have to change the drive train to match it.
  3. I know I need a new flywheel (I think any JZ flywheel works for this setup please correct me if I am wrong)
  4. I need to get the JZ bellhousing to mate my trans and engine
  5. The wiring harness will be an issue to mate for the interior electronics
I have easy access to getting a junkyard 2JZ-GE either VVTI or non-VVTi but I have heard the non VVTI is the better option (again please correct me if I am wrong).

What else am I missing for this swap?

Also if anyone knows how I can get a 1J for a decent price I would rather do that swap and I would save for the R154 and drivetrain upgrades as needed.
 
#2 ·
Rear sump non-vvti 2JZ-GE is what you want. From an SC300.

You'll need the complete dressed engine with accessoriesMAFwiring harnessand ECU.

2JZ-GE specific flywheel and bellhousing for an NA MK4 Supra 5-spd. Flywheels are specific to a particular engine + trans combo. So a JZ R154 or JZ V160 flywheel won't work with a JZ W58. Same for bellhousings. You'll be able to re-use your W58 clutch kit and slave cyl with the JZ flywheel but obviously a new clutch is recommended.

Don't forget about A/C linesPS linesfuel linesand the custom exhaust work that'll be needed.

Yesthe wiring harness will be a pain. Engine functions will work off of the 2JZ-GE ECU. You'll need to get very familiar with wiring diagrams to integrate the various power and relays it needs into the MA70 chassis. Use the stock 7M-GE gauge sending unit sensors for your oil pressure and water temp in the gauge cluster. The non-vvti is desirable because the ECU is a lot simpler and easier to make 'happy' with a swap like this. The VVTi 2JZ-GE is basically a standalone-only option right off the bat.

It's a lot easier to just rebuild a 7M-GE if all you want is a driver/cruiser. Stop bringing it to shopsdo it all yourself. If you needed shops to refresh a 7M-GE you're going to pay a shitload of money to get a 2JZ-GE swap completed.
 
L
#9 ·
My original plan when the 7M-GE went out was to 1J swap it. Right now that just is no in the cards for me though. Especially with how expense a 1J has gotten since I first obtained my MK3. I would love to learn how to rebuild my 7M on my ownbut I'm a college student living at homeand my mom will not let me leave a torn apart engine in the garage. She doesn't even want anyone parking in the garage to begin with.
 
#3 ·
I would also like to warn the OP that a 2JZ swap MK3 will become a love/hate relationship. A never-ending money pit. But since I'm happily divorced I need to spend my money on something..

Oh BTW welcome to your new addiction :ROFLMAO:

You are going to need this site

 
L
#7 ·
At first it was the head gasketwhich is why it went for the rebuild. Then the first shop pinched the new gasket (they would not insure a metal one btw) so when I went to go pick my car up after everything being done it blew again after 5 minutes on the freeway. Then after the second attempt with a different shop I think a bearing or something went out. While driving all oil pressure dropped and there were metal shaving in the oil. I would try and rebuild my 7M on my own but I am still a college student who lives with their parents and my mom would rather kill me than let me leave a torn apart engine in her garage.
 
#10 ·
Sorrydudebut you are in a bind. A 1JZ swap is well over $8k if you do the work yourself and have somewhere to do it. It's not a quick projecteither.

The reason why the mechanic did not use a metal head gasket is it's a major operation to change to one. You basically have to take the engine completely apart in order to machine the deck properly.

My recommendation is to sell this car and drive an old Corolla until you are out of collegehave a good joband a garage of your own. You have also learned the hard way that good mechanics are hard to find. I'm just being realistic here.
 
L
#11 ·
Driving another car isn't an issue for me right now as my Supra was not my daily. I thank you for the concern there though. The engine was machined during the process of the first rebuildbut they said they would not insure it due to it not being oem and they did not want to be responsible for it potentially being an issue. During the first rebuild we tore the entire engine apart because I knew from previous work that pistons 1 and 3 had bad rings. The second attempt at a rebuild did get a metal head gasketbut I am not sure what would have caused it to blow the way it did.

I do not think I am going to sell it as the mk3 is one of my dream cars weather or not it turbo. I do agree that realistically selling the car is probably the way to go at this point but I have committed myself to it.

I have a few other routes I could go as well.

1. I convince my mom to let me do the work in my garage.

2. My stepdad has a 7mge that he sent to a machine shop a while ago but it needs to be reassembled. SoI could potentially use that engine.

3. One lase attempt on my current 7m with a shop. There are a few shops by my work that I could check out and talk toso I could also stop by after work to check on it if needed.
 
#12 ·
Tough time of life to take on a project carespecially considering the learning curve. I've been there with a non-running project car in college that I really likedand the best thing I did was sell it. There's a lot of other things to put your energy towards right nowand this car will likely drain you in multiple ways.

There's also no harm in letting the car sit. Just get a good cover and raise it off the ground with some wheel blocks. Inspect it every month for critters and whatnot. And I mean let it sit until you get a decent paying full-time job. You can gather some knowledge in the meantime and think-out the drivetrain. Whether or not your mom lets you do this is another matter.
 
#13 ·
Sorry for making the assumptionbut I keep hearing about young people buying an old Supra as their only car.

Yesas Whoosh10 saysfind a safe and dry place to park it. Talking to shops is a good idea. Finding one that regularly deals with older cars is critical.

It's not a complicated enginebut there are gotchas. One big mistake is not having the front timing cover in place when machining the deck for an MLS gasket. That mistake means the head doesn't sit flatso it'll never seal.

Stilldoing your own labor as much as possible will likely get you a better outcome. Paying someone gets very expensive quickly. It takes care and time to get an engine put together correctly.
 
M
#15 ·
If you're doing the swap yourself the wiring may be the trickiest partas Tweak'd Performance is not doing swap harnesses anymoreif memory serves. But it's not a completely insurmountable problemif you can read wiring diagrams (the ones from your carand the ones from the donor carif you can get them)and you have some patience.

I also got tired of blown head gaskets on the 7M-GE in my Supraso went the 2JZ-GE route via a JDM engine. That engine was MAP based as opposed to MAF basedso not quite the same thing as you're planningbut pretty close. I drove the car with that engine for over 8 years with ZERO problemsother than having to add a small (3/8") bypass on the heater hose outlet from the head to the heater hose return line to the pumpthat the 7M engine didn't have. Can't remember where I got the bypass "H" pipe assembly from. Very glad I did the swap. Kept the same trans (R154)so didn't have to get a new driveline (already had a single-piece driveline).

The ancillary parts do start to add upbut in the endyou might only be into it dollar-wise as much as a new head gasket on the 7Mif you otherwise would've had someone else do the HG repair properly AND you've already got the rear-sump engine. Ancillary parts are PS pressure hoseextending the alternator wiring (charge wire3-wire harness) to passenger side of carintake pipingexhaust pipingand probably some other stuff that doesn't come to mind right now.
 
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