khoyos

I am running a bone stock 2JZGTE+R154 in my 84 Z31. It is not as straightforward as you think but it has been done before. My engine was from a JZS147 Aristo, mated with JZA70 manual tranny, running auto wiring loom. As far as I can remember, these are the issues that you need to consider before deciding on 2JZ. FYI, I have also run RB25 (in stock form and slightly modified condition running 50trim T3/T04E with stock unopened longblock) 1. As mentioned by tonycharger72, exhaust route is not the same as RB engines. Mine crosses from right to left right under the gearbox. 2. You need to get Supra oil sump. Aristo sumps don't work. Clears crossmember nicely. 3. Clutch master cylinder. If you still run twin turbo setup, you need to change to a slightly smaller clutch master cylinder. Same goes for the brake booster. (this applies to Right Hand Drive Vehicles. You lucky people!) 4. Tubings for hydraulic fan setup. 5. The digital tach and speedo won't work. Other than that, it's normal engine transplant process of mating donor engine wiring loom to existing loom, mounting fabrication for engine and tranny crossmembers, mating gearbox's shaft to prop shaft, etc etc etc Plus points: 1. R154 clears trans tunnel (barely though) 2. The torque of 2jz even in stock form, makes the transplant worth it. Far more superior compared to Rb25! 3. It fits! 4. Absolutely no temp problems, and i'm living in a country where its 95 degrees 24/7, all year round! 5. Did I mention the difference in torque? If there are any questions, I will try my best to answer them. But I do apologise in advance for not being able to answer technical/detailed questions as I am not the one who did the engine transplant process. In my country, it is cheaper to pay the mechanic to install the engine instead of DIY. Answering the original question, 2jz transplant is more tedious but its worth it! Here's some pics to share 1. Right after completion of engine transplant, sent car for intercooler pipes and exhaust pipe works after all works done p/s 2jz+R154 works best with 4.1 final drive ratio. Tried 4.3 but it's too "explosive" and the powerband ends too soon, while 3.6 makes the wait for 2nd turbo to spool up a bit too long but extremely effective for highway runs!

after T3/T04E turbo upgrade:

here's a step by step guide courtesy of skylinesaustralia forum. http://www.skylinesaustralia.com/forums/to-Greddy-style-Plenum-t181826.html

i dunno if this helps clearance issues? well, some part of the front frame had to be cut, my hands cant reach the drain plug(can only drain if i remove radiator), everything fits with less than half inch clearance. apart from that, its fine. ran in sepang circuit trackday with ambient temp of 40 deg C, track temp much higher and the water temp is where it's supposed to be. so i bet it would be fine in the States where its much cooler...

i'm using OEM R32 GTS-T on my RB25DET Z31

here's mine 85 ZXT auto with RB25DET manual transplant... its very very very hard to get the kouki facelift over here in malaysia. guess i'll have to settle with the rather ugly zenki front bumper...