1. Limited Space: The engine bay in a 1991 Mazda 626 is relatively compact, making it difficult to fit two turbochargers and their associated components.
2. Engine Modifications: To properly handle the increased power and stress of a twin turbo setup, you would need to modify the engine, including strengthening the internals (pistons, rods, etc.), upgrading the fuel system, and possibly even upgrading the transmission.
3. Cost and Complexity: A professional twin turbo installation is a significant undertaking, both in terms of time and cost. It would require specialized knowledge, custom fabrication, and high-quality parts.
4. Engine Compatibility: While it's technically possible to adapt a twin turbo setup, it's crucial to consider the engine's original design. The 1991 Mazda 626 engine was not designed for turbocharging, and modifying it could lead to reliability issues.
5. Safety and Emissions: A poorly implemented twin turbo setup could negatively impact the car's safety and emissions compliance.
Instead of a twin turbo setup, consider these options:
* Engine Swap: Swap in a more powerful engine from a later model Mazda or another car manufacturer that already has a turbocharger.
* Supercharger: A single supercharger installation might be a more practical and less complex option for boosting power.
* Performance Modifications: Focus on other performance upgrades, such as a high-flow exhaust, cold air intake, and ECU tuning, to improve power and efficiency without the complexity of turbocharging.
Before making any major modifications, carefully assess the potential risks and benefits. Consult with a qualified mechanic or performance shop for expert advice.
