So I finally decided on which engine to swap out the 1uz for (2jz) and now i can’t find many videos on any type of information for it, i know that i will obviously need a new harness and motor mounts but what about power steering lines and other lines of that nature? can they still be used on the 2jz? also will the driveshaft and diff need to be replaced as well?

 

There are so many differences you'll need a donor car. Don't attempt this find a Supra or SC with the 2JZ.

 

It has actually been done quite a lot and is well documented. Many members here have swapped out their 1UZ engines in favor of a 1JZ-GTE, 2JZ-GTE or built 2JZ-GE NA-T setup.

Check out Gerrb's big thread on the wiring for starters if you plan to do that yourself: https://www.clublexus.com/forums/per...made-easy.html

And check out Ali SC3's big 2JZ-GE NA-T threads if you plan to go that route:

https://www.clublexus.com/forums/sc-...t-ecu-mod.html

https://www.clublexus.com/forums/per...-the-guru.html

The only SC model that I *don't* recommend doing this with is any 1998, 1999 or 2000 model year SC400 VVT-i since they are so rare and unique to begin with and due to added complexity in the wiring. People search for the 98-00 SC400's and its much harder to swap in one of those later VVT-i 1UZ engines than it is to convert a 92-97 SC400 to a 1JZ or 2JZ setup.

 

While it can absolutely be done, It's genuinely better to just find a SC300 and go from there. In theory these cars should be easy to swap from 92-97 since they share the same suspension, mounting points, ect ect. but like all projects It takes TIME, MONEY, WILLPOWER, PARTS. and you usually only get to pick two of those. But say you do go forward. you'll probably need whatever it takes under hood such as ecu, harness the works.very likely a different driveshaft, or hell may as well manual swap it while you're there to the...what was it? W58? probably a 300 Dash cluster. not entirely sure on the rear diff. maybe since it might be different gear ratios with the 400. uhm...yeah thats all i got on the top of my head. seriously though, start with a 300. it'll cut in half whatever your plan to modify in time, money, parts.

 

^^ This is also sound advice. It is well documented and can be done and at this point in time perhaps a good, clean 92-97 SC400 is a good starting point if no SC300 in similar shape can be found... but it is also easier to just begin with an SC300, yes.

The 1UZ engine harness obviously isn't useful for any JZ swap. The instrument cluster does not need to be changed-- that's the same between S300's and SC400's as are suspension parts and the differential *system*. The SC400's stock 3.92:1 rear diff is actually a decent ratio for a 2JZ-GTE, 1JZ-GTE or 2JZ-GE NA-T other than that it should have an LSD fitted. Many rear diff ratio options are available.

SC300/400 stock fuel pumps and fuel ecus are the same and in either case the pump needs to be upgraded and at minimum the +12V Fuel Mod w/Relay & using the stock SC Fuel ECU as the control trigger needs to be done.

The SC steering racks are the same between the 300 and 400. SC300 2JZ-GE engine mounting brackets will align any JZ block (with the correct engine mounts) onto the SC300/400 front crossmember. Rear driveshafts are the same between the 300/400... only the front driveshaft needs to be the right one and possibly modified depending on the transmission you will be using.

The *chassis* electrical system is the same between both cars. The SC400 in some model years has a 150A rated alternator fuse while the SC300's have a 120A rated alternator fuse but in all the years people have built these cars I have never heard that the wiring is any different in that regard other than the fuse itself, meaning the chassis wiring was designed for both applications to handle the highest current load from the SC400's higher output alternator (SC300's max out at 100A from the most powerful factory alternator).

The SC body plugs (where the engine harness plugs into) accept all the same inputs between the V-8 versions and I-6 versions. At that point the harness wiring pinout guide of your choice (unless you hire out the work) will be your guide.

All that being said... yes it is still easier to go the JZ turbo engine swap route if you begin with an SC300 rather than an SC400. As Klapped96 says above, OP, it's just a bit more time, money and work.

Any engine swap or build will cost more than you initially thought it would to get everything done right to the very finish. In that sense it is all relative. Starting with a good chassis is also a consideration.

Only you can decide if beginning with your good SC400 or a good SC300 that you'd find is the right starting point for your project.