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The Nissan 240SX has long been a favorite among car enthusiasts, known for its lightweight chassis and rear-wheel-drive layout. However, many owners seek to enhance performance beyond what the stock engine can provide. One of the most popular modifications is the LS engine swap, which can significantly boost horsepower and torque. In this article, we will guide you through a step-by-step LS swap build for the 240SX, aiming for an impressive 650 horsepower.
Understanding the LS Engine
The LS engine series, originally designed by General Motors, is renowned for its power potential, lightweight construction, and aftermarket support. Commonly found in Chevrolet vehicles, these engines can easily be modified to produce high horsepower figures. The most popular LS variants for swaps include:
- LS1: 5.7L V8, known for its balance of power and reliability.
- LS3: 6.2L V8, offers more power out of the box.
- LS7: 7.0L V8, designed for high-performance applications.
Parts Needed for the LS Swap
Before diving into the swap, it’s essential to gather all necessary parts. Here’s a list of components you will need for a successful LS swap into your 240SX:
- LS engine (LS1, LS3, or LS7)
- Engine mounts specific to the 240SX
- Transmission (T56 or 4L60E recommended)
- Transmission mount
- Driveshaft
- Wiring harness
- ECU (engine control unit)
- Fuel system upgrades (fuel pump, injectors)
- Exhaust headers
- Cooling system (radiator, hoses)
- Performance parts (intake, camshaft, etc.)
Step-by-Step LS Swap Process
Step 1: Remove the Stock Engine
Start by disconnecting the battery and draining fluids from the stock engine. Remove the following components:
- Intake manifold
- Exhaust manifold
- Fuel lines
- Wiring harness
- Radiator and cooling hoses
- Transmission (if applicable)
Once all components are removed, unbolt the engine from the engine mounts and carefully lift it out of the engine bay.
Step 2: Install LS Engine Mounts
With the stock engine out, install the LS engine mounts according to the manufacturer’s instructions. Ensure they are securely fastened and aligned correctly to accommodate the LS engine.
Step 3: Fit the LS Engine
Carefully lower the LS engine into the engine bay, aligning it with the newly installed engine mounts. Secure the engine in place using the appropriate bolts.
Step 4: Install the Transmission
Attach the transmission to the LS engine. Ensure the transmission mount is also installed and aligned correctly. If using a T56 transmission, you may need to modify the tunnel for proper fitment.
Step 5: Wiring and ECU Setup
Install the wiring harness and connect it to the LS engine. This may involve splicing and connecting various wires to ensure proper functionality. Mount the ECU in a safe location within the cabin or engine bay.
Step 6: Upgrade the Fuel System
Replace the stock fuel pump with a high-performance unit capable of supplying the LS engine’s fuel demands. Install larger fuel injectors and ensure all lines are securely connected.
Step 7: Exhaust System Installation
Install the exhaust headers designed for the LS engine. Connect them to an aftermarket exhaust system that can handle the increased flow and sound requirements of the new engine.
Step 8: Cooling System Setup
Install a high-performance radiator and connect the cooling hoses. Ensure the cooling system is capable of handling the increased heat generated by the LS engine.
Step 9: Final Checks and First Start
Before starting the engine, double-check all connections, fluid levels, and mounts. Ensure there are no leaks. Once everything is verified, fire up the engine for the first time and listen for any issues.
Performance Parts for 650 HP
To reach the goal of 650 horsepower, additional performance modifications are necessary. Consider the following upgrades:
- High-performance camshaft for improved airflow.
- Aftermarket intake manifold for better breathing.
- Upgraded throttle body to increase air intake.
- Forced induction (supercharger or turbocharger) for significant power gains.
- High-flow fuel injectors to support increased fuel demand.
- Performance tuning of the ECU to optimize engine performance.
Conclusion
The LS swap into a Nissan 240SX is a rewarding project that can transform your vehicle into a high-performance machine. With the right parts and attention to detail, achieving 650 horsepower is within reach. Remember to always prioritize safety and follow proper tuning practices to ensure your build runs smoothly and reliably.