Rx-8 Ls Swap: Achieving 600+ Hp with a Blueprint Engines Ls3 Conversion

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The RX-8 has long been a favorite among car enthusiasts for its unique rotary engine and lightweight chassis. However, many have sought to enhance its performance by swapping in a more powerful engine. One of the most popular choices for this upgrade is the LS3 engine from General Motors. In this article, we will explore the process of performing an LS swap on an RX-8, specifically focusing on achieving over 600 horsepower with a Blueprint Engines LS3 conversion.

Why Choose an LS Swap for the RX-8?

The RX-8’s rotary engine, while innovative, has its limitations in terms of power and reliability. Swapping in an LS engine offers several advantages:

  • Power Potential: The LS3 engine can easily produce over 400 horsepower in stock form, with the potential for much more with upgrades.
  • Availability of Parts: LS engines have a vast aftermarket support, making it easier to find parts and upgrades.
  • Reliability: LS engines are known for their durability and longevity, often outlasting their rotary counterparts.
  • Weight Distribution: The LS engine is relatively lightweight, helping maintain the RX-8’s balanced handling.

Blueprint Engines LS3 Overview

Blueprint Engines provides high-quality, pre-assembled LS3 engines that are designed for performance and reliability. Their LS3 conversion includes several key features:

  • Premium Components: Blueprint Engines uses top-tier parts, ensuring a robust and powerful engine.
  • Dyno Tested: Each engine is dyno tested to verify performance and reliability before shipping.
  • Customizable Options: Blueprint offers various options for camshafts, intakes, and more to tailor the engine to your specific needs.

Preparation for the Swap

Before diving into the swap, proper preparation is crucial. Here’s what you need to consider:

  • Tools Required: Ensure you have the necessary tools, including wrenches, sockets, lifts, and engine hoists.
  • Workspace: A clean, organized workspace will help streamline the process.
  • Documentation: Have access to manuals and guides for both the RX-8 and LS3 engines.
  • Parts List: Compile a comprehensive list of all parts needed for the swap, including mounts, wiring harnesses, and exhaust systems.

Step-by-Step Swap Process

1. Remove the Existing Rotary Engine

Begin by disconnecting the battery and removing any components that obstruct access to the rotary engine. This includes:

  • Air intake and filters
  • Radiator and cooling components
  • Exhaust system
  • Wiring harness and electronics

Once everything is disconnected, use an engine hoist to carefully remove the rotary engine from the chassis.

2. Install the LS3 Engine

With the rotary engine removed, it’s time to install the LS3. Follow these steps:

  • Install the LS engine mounts onto the LS3 engine.
  • Position the LS3 into the engine bay using the engine hoist.
  • Align the engine with the mounts and secure it in place.

3. Connect the Wiring Harness

One of the most critical steps is connecting the LS wiring harness. This involves:

  • Routing the harness through the engine bay.
  • Connecting all necessary sensors and components.
  • Integrating with the RX-8’s electrical system.

4. Install the Exhaust System

The LS3 will require a custom exhaust system to fit the RX-8. This includes:

  • Custom headers that align with the LS3 ports.
  • Connecting pipes that fit the RX-8 chassis.
  • High-performance mufflers for optimal sound and flow.

5. Cooling System Setup

Ensure the cooling system is adequate for the LS3. Steps include:

  • Installing a larger radiator capable of handling increased heat.
  • Connecting new hoses and ensuring no leaks.
  • Filling the system with coolant and checking for proper operation.

6. Final Checks and Testing

Before starting the engine, perform final checks:

  • Verify all connections and mounts are secure.
  • Check fluid levels for oil, coolant, and transmission fluid.
  • Ensure there are no loose wires or components.

Achieving 600+ HP with the LS3

To push the LS3 beyond 600 horsepower, consider the following modifications:

  • Performance Camshaft: Upgrading to a high-performance camshaft can significantly increase horsepower.
  • Cold Air Intake: A high-flow cold air intake will improve airflow to the engine.
  • Tune the ECU: A custom tune can optimize performance and fuel efficiency.
  • High-Performance Exhaust: Upgrading to a free-flowing exhaust system will enhance power and sound.

Conclusion

The RX-8 LS swap is a thrilling project that can transform the car into a high-performance machine. With the right preparation, parts, and modifications, achieving over 600 horsepower with a Blueprint Engines LS3 conversion is entirely possible. This swap not only enhances power but also brings a new level of reliability and excitement to the driving experience.