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The Mazda RX-7 is a legendary sports car known for its lightweight design and rotary engine. However, many enthusiasts have turned to LS swaps to achieve greater power and reliability. In this article, we will explore how to achieve a 650 horsepower RX-7 LS swap using a Whipple supercharger and Precision turbo.
Understanding the Basics of LS Swaps
LS swaps involve replacing the factory engine with a General Motors LS engine. This conversion is popular due to the LS engine’s power potential, aftermarket support, and reliability. Before diving into the details of achieving 650 hp, let’s review some essential components of an LS swap.
- Engine Mounts
- Transmission Compatibility
- Wiring Harness
- Cooling System
- Fuel System
Selecting the Right LS Engine
Choosing the right LS engine is crucial for achieving your horsepower goals. The LS3 and LS7 are two popular options that can easily handle the additional boost from a supercharger and turbo.
LS3 Engine
The LS3 engine, found in the Corvette, produces 430 hp in stock form. With the right modifications, it can easily support 650 hp with forced induction.
LS7 Engine
The LS7 engine, known for its high-performance capabilities, produces 505 hp and features a larger displacement, making it an excellent choice for high horsepower builds.
Installing the Whipple Supercharger
The Whipple supercharger is a popular choice for many LS enthusiasts due to its efficiency and reliability. It provides significant power gains while maintaining drivability.
- Choose the correct Whipple supercharger model for your LS engine.
- Follow the installation instructions carefully.
- Ensure proper alignment and sealing of the supercharger.
Integrating the Precision Turbo
The Precision turbocharger adds another layer of power potential. It allows for more air intake, increasing horsepower significantly. Proper integration is essential to maximize performance.
- Select a turbo size that complements your supercharger.
- Install the necessary piping and intercooler.
- Tune the engine for optimal performance with both forced induction systems.
Building the Supporting Mods
To reach 650 hp, supporting modifications are necessary. These include upgrades to the fuel system, exhaust system, and engine internals.
Fuel System Upgrades
A high-performance fuel pump and injectors are essential to deliver the required fuel flow for your setup. Consider using:
- Upgraded fuel injectors
- High-flow fuel pump
- Upgraded fuel lines
Exhaust System Modifications
A free-flowing exhaust system will help reduce back pressure and improve performance. Consider:
- Long tube headers
- High-flow catalytic converters
- Performance mufflers
Engine Internals
Strengthening the engine internals can help handle the increased power. Look into:
- Forged pistons
- Upgraded connecting rods
- High-performance camshaft
Tuning for Maximum Performance
After all components are installed, tuning is crucial. A professional tune will ensure that your engine runs efficiently and safely at 650 hp.
- Use a reputable tuning service.
- Monitor air-fuel ratios and boost levels.
- Perform dyno testing to validate power output.
Conclusion
Achieving a 650 hp RX-7 LS swap with a Whipple supercharger and Precision turbo is an ambitious but rewarding project. With the right components and careful planning, you can create a powerful and reliable sports car that stands out on the road.