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The E30 BMW, particularly the model produced from 1982 to 1994, has long been a favorite among car enthusiasts and tuners. One of the most popular modifications for this classic is the S50 engine swap, which significantly enhances its performance. This article explores the power gains achieved through the E30 S50 swap, focusing on the transition from the stock 115 horsepower to over 300 horsepower with the addition of turbocharging.
Understanding the E30 and S50 Engine
The E30 was known for its lightweight design and excellent handling characteristics. However, its stock engine, the M10, produced only 115 hp in the 325i model. The S50 engine, derived from the E36 M3, offers a more robust performance with a factory output of around 240 hp. This swap not only increases horsepower but also enhances torque and overall drivability.
The Benefits of the S50 Swap
- Significant horsepower increase from 115 hp to 240 hp (stock S50).
- Improved torque delivery for better acceleration.
- Enhanced engine reliability and performance characteristics.
- Greater tuning potential with aftermarket parts.
Turbocharging the S50 for Maximum Power
While the S50 engine provides a substantial power increase on its own, turbocharging can elevate performance to astonishing levels. Many enthusiasts report power outputs exceeding 300 hp with proper tuning and the right components.
Choosing the Right Turbocharger
Selecting an appropriate turbocharger is crucial for achieving optimal power gains. Popular options include:
- Garrett GT30
- Precision 6266
- Holset HX35
Supporting Modifications
To handle the increased power from turbocharging, several supporting modifications are recommended:
- Upgraded fuel injectors and fuel pump.
- Intercooler for temperature control.
- Stronger clutch and transmission components.
- Upgraded engine management system for tuning.
Performance Gains and Expectations
With the S50 engine swapped and turbocharged, the E30 can achieve remarkable performance metrics. Many enthusiasts have reported:
- 0-60 mph times in the low 4-second range.
- Quarter-mile times in the mid to high 12-second range.
- Top speed exceeding 150 mph.
Challenges and Considerations
While the power gains from an S50 swap and turbocharging are impressive, there are challenges to consider:
- Installation complexity and cost.
- Potential for increased wear on drivetrain components.
- Need for proper tuning to avoid engine damage.
Conclusion
The E30 S50 swap, especially when combined with turbocharging, transforms a modest 115 hp into a thrilling 300+ hp powerhouse. With careful planning, the right components, and attention to detail, enthusiasts can enjoy an exhilarating driving experience that pays homage to the E30’s racing heritage.