The Challenges:
* Space constraints: The MR2 engine bay is relatively small. The Supra's larger engines might require significant modifications or custom fabrication for everything to fit.
* Transmission compatibility: The Supra's transmissions are typically larger and may not directly bolt to the MR2's differential.
* Electronics and wiring: The Supra's engine management system is more advanced than the MR2's, and integrating it will likely involve extensive rewiring and potentially standalone engine management.
* Cooling system: The Supra's cooling system is larger and may need modifications or upgrades to fit the MR2.
Engine Options:
* 2JZ-GE (Naturally Aspirated): This is probably the most popular option. It's relatively compact and powerful. However, you'll need to address the challenges listed above.
* 2JZ-GTE (Turbocharged): Even more powerful, but bigger and more complex. This swap is even more challenging.
* 1JZ-GTE (Turbocharged): A smaller and lighter option, but still requires modifications.
Alternatives:
* Swapping other engines: There are other engines that are more readily compatible with the MR2, like the 3S-GTE from other Toyotas.
* Building the MR2's existing engine: The 4AGE engine can be significantly improved with performance modifications.
Conclusion:
Swapping a Supra engine into an MR2 is possible but not a "plug and play" solution. It requires significant mechanical knowledge, fabrication skills, and a considerable financial investment. Do your research, consider the challenges, and weigh the pros and cons before embarking on this project.
Important Note: Check your local regulations regarding engine swaps. Some areas may have stricter rules than others.
