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The BMW E30 has become an iconic platform for automotive enthusiasts and tuners alike. One of the most exciting modifications that E30 owners undertake is the S50 engine swap. This swap not only enhances performance but also transforms the driving experience. In this article, we will explore documented power gains from E30 S50 swap projects, showcasing why this modification is a favorite among car enthusiasts.
Understanding the E30 and S50 Engine
The BMW E30, produced between 1982 and 1994, is celebrated for its lightweight chassis, balanced handling, and classic styling. The S50 engine, derived from the M3 of the early 90s, is a high-performance inline-six that offers significant power and torque increases compared to the stock E30 engines.
Why Choose the S50 Engine?
The S50 engine is often chosen for its robust design and tuning potential. Here are some reasons why enthusiasts opt for this swap:
- Increased Power: The S50 engine produces significantly more horsepower than the stock E30 engines.
- Enhanced Torque: The S50 offers improved torque delivery, resulting in better acceleration.
- Reliability: With proper maintenance, the S50 is known for its durability and reliability.
- Aftermarket Support: There is a wide range of aftermarket parts available for the S50, allowing for further performance upgrades.
Documented Power Gains
Many E30 enthusiasts have documented their experiences with the S50 swap, providing valuable insights into the power gains achieved. Below are some notable examples:
Example 1: E30 325i to S50 Swap
One owner documented their swap from a stock E30 325i with a M20 engine to a S50B30 engine. The results were impressive:
- Stock M20 Power: 125 hp
- S50B30 Power: 240 hp
- Power Gain: 115 hp increase
Example 2: E30 318i to S50 Swap
Another documented case involved an E30 318i, originally equipped with a M42 engine:
- Stock M42 Power: 134 hp
- S50B30 Power: 240 hp
- Power Gain: 106 hp increase
Example 3: E30 M3 to S50 Swap
Even E30 M3 owners have opted for the S50 swap, looking for additional power:
- Stock S14 Power: 192 hp
- S50B30 Power: 240 hp
- Power Gain: 48 hp increase
Performance Improvements Beyond Power
While the power gains are significant, the S50 swap also brings other performance improvements:
- Improved Throttle Response: The S50 engine provides a more immediate throttle response, enhancing driving dynamics.
- Better Engine Sound: The S50 engine produces a more aggressive and sporty sound, adding to the driving experience.
- Enhanced Cooling: Many swaps include upgraded cooling systems, which help maintain optimal engine temperatures.
- Weight Distribution: The inline-six engine maintains a balanced weight distribution, improving handling.
Challenges of the S50 Swap
While the S50 swap offers numerous benefits, it is not without challenges. Here are some common issues faced during the swap:
- Wiring Harness: Adapting the wiring harness for the S50 can be complex and time-consuming.
- Engine Mounts: Custom engine mounts may be required to fit the S50 into the E30 chassis.
- Transmission Compatibility: Ensuring the right transmission is used can affect the overall performance and drivability.
- Legal Considerations: Depending on local regulations, emissions compliance may be a concern.
Conclusion
The E30 S50 swap is a popular choice among enthusiasts looking to significantly enhance their vehicle’s performance. With documented power gains ranging from 48 to 115 horsepower, the benefits are clear. While challenges exist, the rewards of improved power, torque, and driving experience make this swap an appealing option for many. Whether for track days or daily driving, the S50 engine brings the E30 to a whole new level of performance.