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Can you replace a non-turbo with turbo engine in 91 Toyota MR2?

Yes, it is possible to replace the non-turbo engine in a 91 Toyota MR2 with a turbo engine, but it is not a simple task and will require a significant amount of fabrication and modification.

Here is a general outline of the steps involved:

1. Research and obtain the necessary parts:

- Turbo engine: You will need to source a turbo engine that is compatible with the MR2's drivetrain and engine management system.

- Turbocharger: If the engine does not come with a turbocharger, you will need to purchase and install one.

- Intake and exhaust manifolds: You will need to fabricate or modify the intake and exhaust manifolds to fit the turbocharger.

- Downpipe: You will need to fabricate or modify the downpipe to connect the turbocharger to the exhaust system.

- Charge piping: You will need to fabricate or purchase charge piping to connect the turbocharger to the intake manifold.

- Intercooler: You will need to install an intercooler to cool the compressed air from the turbocharger before it enters the engine.

- Oil feed and drain lines: You will need to fabricate or purchase oil feed and drain lines for the turbocharger.

- Boost control system: You will need to install a boost control system to regulate the boost pressure from the turbocharger.

- Engine management system: You may need to modify or upgrade the engine management system to accommodate the turbocharger.

2. Prepare the engine bay:

- Remove the non-turbo engine and all associated components.

- Clean and prepare the engine bay for the new engine.

3. Install the turbo engine:

- Mount the turbo engine into the engine bay.

- Connect the engine mounts, transmission, and other driveline components.

- Connect the fuel and electrical systems.

4. Install the turbocharger and associated components:

- Install the turbocharger, intake and exhaust manifolds, downpipe, charge piping, intercooler, and oil feed and drain lines.

- Connect the boost control system to the turbocharger.

5. Modify or upgrade the engine management system:

- If necessary, modify or upgrade the engine management system to accommodate the turbocharger.

6. Tune the engine:

- Once everything is installed, you will need to tune the engine to ensure proper operation and performance. This may require the use of a professional engine tuner or dyno.

7. Test drive and troubleshoot:

- Test drive the vehicle and make any necessary adjustments or modifications to ensure proper performance and reliability.

It is important to note that this process is complex and requires a high level of technical expertise and fabrication skills. If you are not confident in your ability to perform this type of work, it is recommended that you consult with a professional automotive technician or performance shop.