Can You Put a Turbo in a Stock 1997 Mitsubishi Eclipse?

The 1997 Mitsubishi Eclipse GST and GSX trims featured a turbo four-cylinder engine in stock form. However, the Eclipse RS and GS trims were equipped with a naturally aspirated four-cylinder that produced 70 less horsepower than its turbocharged variants. For enthusiasts who own the Eclipse RS or GS trim, an aftermarket or custom turbo system can be installed to significantly increase the engine's horsepower. However, a turbocharger cannot be installed on the stock engine without a complete turbo kit that includes supporting modifications.

  1. Turbocharger

    • A turbocharger incorporates two separate turbines connected by a rotation shaft. The engine exhaust flow is routed through one of the turbines, which causes it to spool. This, in turn, spools the other turbine, which is connected to the air intake system. The turbocharger thus feeds the engine with pressurized air, substantially increasing the air available for combustion. To connect a turbocharger to the engine's exhaust flow and intake system, a complete kit of specialized turbo components is required.

    Intake and Exhaust System

    • The stock Eclipse exhaust manifold must be replaced by a turbo manifold to install the turbo onto the engine. Additionally, a specially-designed downpipe is needed to connect the exhaust manifold to the catalytic converter. Since ambient air is fed directly into the intake turbine, a special turbo air intake is also required. Additionally, the stock cat-back exhaust system should be replaced with a high-flow unit to decrease the exhaust back pressure.

    Intercooler

    • When the turbocharger pressurizes air, the air is substantially heated. To resolve this, an intercooler system is connected between the turbocharger and throttle body. The intercooler system consists of an air-to-air radiator, as well as a full piping system to route the air from the turbo to the engine. Additionally, a blow-off valve is installed on the upper intercooler pipe to release excess air pressure when the throttle is lifted. Finally, a custom vacuum hose system is required to equalize the pressure throughout the intake track.

    Fuel System and Tuning

    • Due to the substantial increase in airflow provided by a turbocharger, an increase in fuel injection is required for proper combustion. For non-turbo Eclipse models, the fuel pump and injectors must be replaced with higher-flowing units, as the stock fuel system is not able to reliably flow an adequate amount of fuel for the turbocharger. Additionally, a tuning system is required to electronically control the fuel maps. While piggyback tuners allow for moderate fuel tuning based on the stock ECU, standalone tuning systems replace the ECU altogether and allow for full tuning of the fuel curves and other engine parameters. Either system will allow you to tune a turbo system on the Mitsubishi Eclipse.

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