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The BMW E30 is a beloved model among car enthusiasts, known for its lightweight chassis and engaging driving experience. One of the most popular modifications for the E30 is the S50 engine swap, which can significantly boost performance. In this article, we will explore how to reach 350 horsepower by upgrading the internals and adding forced induction.
Understanding the BMW S50 Engine
The S50 engine, originally found in the E30 M3, is a high-performance inline-six engine that offers a solid foundation for tuning. It features a DOHC design, individual throttle bodies, and a robust build quality that can handle increased power levels.
Key Specifications of the S50 Engine
- Displacement: 3.0 liters
- Power Output: Approximately 192 hp (stock)
- Torque: 199 lb-ft (stock)
- Configuration: Inline-six
Preparing for the Swap
Before diving into the swap, it’s crucial to gather the necessary parts and tools. Proper preparation can make the process smoother and more efficient.
Essential Tools and Equipment
- Socket set
- Wrenches
- Engine hoist
- Torque wrench
- Cooling system tools
- Electrical connectors and tools
Parts Needed for the Swap
- S50 engine
- E30 engine mounts
- Transmission (preferably ZF 5-speed)
- Custom driveshaft
- ECU and wiring harness
- Upgraded cooling system components
Performing the Engine Swap
Once you have all the necessary tools and parts, you can begin the engine swap process. This involves removing the old engine and installing the S50.
Step-by-Step Engine Removal
- Disconnect the battery and remove the negative terminal.
- Drain the fluids from the engine.
- Remove the intake and exhaust manifolds.
- Detach the wiring harness and label connectors.
- Unbolt the engine from the transmission and mounts.
- Use the engine hoist to lift the engine out of the bay.
Installing the S50 Engine
- Position the S50 engine in the engine bay using the hoist.
- Secure the engine mounts to the chassis.
- Connect the transmission to the engine.
- Reattach the wiring harness and ensure all connections are secure.
- Install the intake and exhaust manifolds.
- Refill fluids and reconnect the battery.
Upgrading Internals for Increased Power
To reach the 350 hp target, upgrading the internals of the S50 engine is essential. This ensures that the engine can handle the increased power from forced induction.
Recommended Internal Upgrades
- Forged pistons for higher compression
- Forged connecting rods for strength
- Upgraded camshafts for improved airflow
- Performance valve springs for higher RPMs
- Upgraded oil pump for better lubrication
Adding Forced Induction
Forced induction can significantly increase horsepower and torque. There are two main options: supercharging and turbocharging.
Choosing Between Supercharging and Turbocharging
- Supercharging: Provides instant power and is easier to install.
- Turbocharging: Offers higher power potential and better efficiency.
Recommended Forced Induction Kits
- Vortech Supercharger Kit
- Garrett Turbocharger Kit
- Custom turbo setup with appropriate intercooler
Tuning for Optimal Performance
After installing the forced induction system, tuning the engine is crucial for optimal performance. A proper tune ensures that the engine runs efficiently and reliably at higher power levels.
Choosing a Tuner
Select a reputable tuner with experience in BMW engines and forced induction setups. They will be able to adjust the ECU settings to maximize power while ensuring engine safety.
Tuning Considerations
- Fuel maps for increased injector size
- Ignition timing adjustments for optimal performance
- Boost control settings for desired power levels
Final Thoughts
The E30 S50 swap can be a rewarding project that transforms your vehicle into a high-performance machine. By upgrading the internals and adding forced induction, reaching 350 hp is achievable. With careful planning, quality parts, and professional tuning, you can enjoy an exhilarating driving experience.