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The Mazda RX-7 has long been celebrated for its lightweight chassis and exceptional handling, but enthusiasts looking for more power often turn to engine swaps. One of the most popular swaps is the LS engine, known for its reliability and tunability. In this article, we will explore how to build an 800+ horsepower RX-7 LS swap using forged internals and forced induction.
Choosing the Right LS Engine
The first step in your RX-7 LS swap journey is selecting the right LS engine. There are several variants to choose from, each offering different power outputs and characteristics. The most common options are:
- LS1: The original engine from the Chevrolet Corvette, offering a solid foundation for modifications.
- LS3: A more powerful option with 430 hp, ideal for those seeking higher performance from the start.
- LS7: The ultimate choice, producing 505 hp and featuring forged internals from the factory.
Engine Components and Forged Internals
To achieve 800+ horsepower, upgrading to forged internals is crucial. This ensures the engine can handle the increased stress from forced induction. Key components to consider include:
- Forged Pistons: These provide better strength and resistance to detonation.
- Forged Connecting Rods: Essential for handling high RPMs and power levels.
- Upgraded Crankshaft: A forged crankshaft will provide the durability needed for high horsepower applications.
Forced Induction Options
To reach the 800 hp mark, forced induction is a must. There are two primary options to consider: superchargers and turbochargers. Each has its advantages:
- Supercharger: Provides instant power with a linear power band, ideal for street applications.
- Turbocharger: Offers higher peak power and efficiency, but with potential lag. Great for track use.
Supporting Modifications
To support the increased power output, several modifications are necessary. These include:
- Fuel System Upgrade: High-flow fuel injectors and a larger fuel pump are essential for delivering adequate fuel.
- Cooling System: An upgraded radiator and intercooler will help manage the increased heat from the engine.
- Exhaust System: A free-flowing exhaust will improve performance and sound.
Tuning Your RX-7
Once your engine swap and modifications are complete, proper tuning is critical. A professional tuner can help you maximize power and ensure reliability. Key tuning aspects include:
- Air-Fuel Ratio: Ensuring the right mixture for optimal combustion.
- Ignition Timing: Adjusting timing for maximum performance without knocking.
- Boost Levels: Setting the appropriate boost for your setup to prevent engine damage.
Final Thoughts
Building an 800+ hp RX-7 LS swap with forged internals and forced induction is a rewarding project that requires careful planning and execution. By choosing the right components and ensuring proper tuning, you can create a powerful and reliable machine that stands out on the road or track.
Whether you are a seasoned builder or a newcomer to the world of performance modifications, this guide will help you navigate the process of maximizing your RX-7’s power potential.