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The Chevy LS engine platform has gained immense popularity among car enthusiasts for its versatility and performance potential. Many enthusiasts start their LS swaps with a power level around 450 horsepower, but with the right modifications, it is possible to boost that figure to an impressive 700 horsepower using twin turbos. In this article, we will explore the necessary supporting modifications and considerations for achieving this power increase.
Understanding the Chevy LS Engine
The LS engine family, originally designed by General Motors, is known for its lightweight aluminum construction and robust architecture. These engines are capable of handling significant power increases with the right modifications. Key features that contribute to this capability include:
- Strong iron or aluminum block
- Forged steel crankshaft
- High-flow cylinder heads
- Efficient intake and exhaust systems
Initial Setup: Starting with 450 HP
Before diving into turbocharging, it’s essential to establish a solid foundation. An LS engine producing 450 horsepower typically includes the following components:
- Aftermarket camshaft for improved airflow
- Upgraded intake manifold
- High-flow fuel injectors
- Performance exhaust system
Upgrading to 700 HP: Key Modifications
To achieve 700 horsepower with twin turbos, several critical modifications are necessary. Each component plays a vital role in ensuring the engine can handle the increased power and maintain reliability.
1. Turbocharger Selection
Choosing the right twin turbo setup is crucial. Consider the following factors:
- Turbo size and type (e.g., journal bearing vs. ball bearing)
- Boost levels and efficiency maps
- Compatibility with your engine’s powerband
2. Fuel System Upgrades
As power increases, so does fuel demand. Upgrading the fuel system is essential to support higher horsepower levels:
- High-flow fuel pump
- Upgraded fuel lines
- Higher capacity fuel injectors
- Adjustable fuel pressure regulator
3. Engine Management System
A reliable engine management system is necessary for tuning and optimizing performance. Consider the following:
- Standalone ECU or reprogrammed factory ECU
- Wideband O2 sensors for accurate air-fuel ratio monitoring
- Tuning software for real-time adjustments
4. Exhaust System Modifications
A well-designed exhaust system is crucial for turbo performance. Upgrades should include:
- Turbo headers for optimal flow
- High-flow catalytic converters (if applicable)
- Performance cat-back exhaust system
5. Cooling System Enhancements
Increased power output generates more heat, necessitating a robust cooling system:
- Upgraded intercooler to reduce intake temperatures
- High-capacity radiator
- Performance cooling fans
6. Strengthening Internal Components
To handle the increased power, consider upgrading internal engine components:
- Forged pistons for enhanced durability
- Upgraded connecting rods
- Heavy-duty crankshaft
Tuning for Maximum Performance
Once all modifications are complete, the tuning process is critical to ensure the engine runs efficiently and reliably at 700 horsepower. Key aspects of tuning include:
- Optimizing air-fuel ratios
- Adjusting ignition timing
- Monitoring boost levels
- Testing for knock and detonation
Conclusion
Boosting a Chevy LS swap from 450 to 700 horsepower with twin turbos is an ambitious yet achievable goal. By carefully selecting and upgrading key components, enthusiasts can unlock the full potential of their LS engines. With the right modifications and tuning, the performance gains can be exhilarating, providing a thrilling driving experience.