Introduction
BMW is renowned for crafting exceptional engines that seamlessly combine performance, reliability, and innovation. Among their remarkable creations, two engines stand out as contenders for the title of BMW’s best: the B58 vs S58. The B58, launched in 2015, gained immediate acclaim for its power, efficiency, and adaptability.
The S58, introduced in 2019, takes performance to new heights with its twin-turbocharged design and advanced engineering. In this article, we’ll dive deep into what makes these engines exceptional, comparing their features, performance, reliability, and overall impact on BMW’s legacy.
Step-by-Step Analysis of the B58 Engine
Overview of the B58 Engine
- Introduction Year: 2015
- Configuration: Inline-six with a single twin-scroll turbocharger
- Power Output: 382 horsepower and 369 lb-ft of torque
- Notable Achievements: Winner of the 2020 Ward’s Top 10 Engines Award
The B58 engine became a favorite for enthusiasts and everyday drivers alike, blending power, efficiency, and modularity. Its versatility has seen it equip numerous BMW models, including the 2 Series, 3 Series, 4 Series, and even the Toyota Supra.
Key Features of the B58 Engine
- Modular Design: Shares 80% of parts with the inline-four B48 engine, making replacements affordable and accessible.
- Durability: Equipped with forged crankshafts and rods, a crank girdle, and a robust block for handling high torque and power.
- Smooth Power Delivery: The engine’s balanced design ensures consistent power output across all cylinders.
- Reliability: Minimal factory issues over a decade, with notable durability for daily driving and mild tuning.
Strengths of the B58 Engine
- Tuning Potential: Supports up to 500 horsepower reliably with OEM components.
- Sound Quality: Offers a rich exhaust note appreciated by enthusiasts.
- Maintenance: Few reported issues, limited to fuel injector wear and PCV replacements.
Step-by-Step Analysis of the S58 Engine
Overview of the S58 Engine
- Introduction Year: 2019
- Configuration: Inline-six with twin mono-scroll turbochargers
- Power Output: 473 horsepower (standard) and up to 503 horsepower (Competition models)
- Notable Applications: Found in the G80 M3, G82 M4, and other M-series models.
The S58 engine builds on the strengths of the B58, delivering unparalleled performance and a focus on track-ready reliability.
Key Features of the S58 Engine
- Twin-Turbocharging: Two mono-scroll turbochargers enhance power delivery and throttle response.
- Improved Cooling System: Equipped with three radiators, an additional cooler, and a separate transmission cooling system for sustained performance.
- Revised Compression Ratio: Reduced from 11:1 to 9.3:1, allowing for higher boost pressures and greater performance.
- Advanced Manufacturing: 3D-printed cylinder heads enhance precision and efficiency.
Strengths of the S58 Engine
- Peak Performance: Delivers higher power output than the B58, making it a favorite for track enthusiasts.
- Enhanced Reliability: Features such as a one-piece crank hub eliminate common issues seen in previous engines.
- Cooling Efficiency: The redesigned system ensures stable operation under extreme conditions.
Comparison Table: B58 vs. S58 Engine Features
| Feature | B58 Engine | S58 Engine |
|---|---|---|
| Launch Year | 2015 | 2019 |
| Configuration | Inline-six with twin-scroll turbo | Inline-six with twin mono-scroll turbos |
| Horsepower | 382 | 473–503 |
| Torque | 369 lb-ft | 442–479 lb-ft |
| Reliability | Proven over a decade | Early signs of strong reliability |
| Applications | Multiple BMW models and Supra | M-series models |
| Cooling System | Standard design | Advanced multi-radiator setup |
In-Depth Breakdown of Features
Interior and Build Quality
Both engines feature aluminum construction for the block and head, ensuring lightness and strength. The modular design of the B58 simplifies manufacturing and reduces costs, while the S58’s bespoke parts prioritize peak performance.
Performance and Handling
The B58 excels in smooth and consistent power delivery, ideal for daily driving. In contrast, the S58 is engineered for maximum output, with a shorter stroke and higher rev range, making it perfect for high-performance applications.
Top Speed
While top speed varies depending on the model, vehicles equipped with the S58 generally offer higher maximum speeds due to their increased power.
Price and Affordability
The B58 is more cost-effective, both in initial purchase and maintenance. The S58, being a performance engine, comes at a premium, both for the engine itself and related parts.
Engine Components and Parts
- B58: Modular, widely available, and affordable.
- S58: Specialized components with cutting-edge technology, resulting in higher costs but superior performance.
Pros and Cons
B58 Engine:
Pros:
- Reliable and proven track record
- Affordable maintenance
- Excellent for daily use and light tuning
Cons:
- Less powerful than the S58
- Standard cooling system
S58 Engine:
Pros:
- Unmatched power and performance
- Advanced cooling and fuel systems
- Optimized for track use
Cons:
- Higher cost of ownership
- Twin turbo setup introduces additional complexity
Available Colors
The engines themselves are standard, but the vehicles they power often come in a wide range of customizable BMW paint options, including metallic and matte finishes.
Final Review: Which Engine is Best?
Choosing between the B58 vs S58 depends on your priorities. For daily driving, reliability, and affordability, the B58 remains an unbeatable choice. However, for enthusiasts seeking peak performance and track-ready capabilities, the S58 is the ultimate engine. Both engines highlight BMW’s dedication to innovation, quality, and engineering excellence.
FAQs
What is the difference between the BMW B58 and S58 engines?
The primary difference lies in their design, power output, and application. The B58 is a single-turbocharged inline-6 engine designed for a balance of power and efficiency, while the S58 is a twin-turbocharged inline-6 engine focused on high performance for BMW M models.
Which BMW models use the B58 engine?
The B58 engine is found in models like the BMW 340i, Z4 M40i, X5 xDrive40i, and the 540i. It is designed for luxury and everyday performance.
What BMW models come with the S58 engine?
The S58 engine powers BMW’s M models, including the M3, M4, X3 M, and X4 M. It delivers high performance and is designed for track and street use.
How much horsepower does the B58 engine produce?
The B58 engine produces between 335 to 382 horsepower, depending on the model and tuning.
How much horsepower does the S58 engine deliver?
The S58 engine delivers between 473 to 503 horsepower in its standard and Competition variants.
Is the B58 engine more reliable than the S58?
Both engines are reliable, but the B58 is often seen as more durable for long-term daily use due to its simpler design. The S58, while robust, is more performance-oriented and may require more maintenance under heavy use.
Which engine is better for tuning: B58 or S58?
The S58 is better suited for aggressive tuning due to its twin-turbo design and performance focus. However, the B58 also offers great tuning potential for enthusiasts who want a balance of power and reliability.
Can the B58 engine compete with the S58 in performance?
While the B58 delivers impressive performance, the S58 surpasses it with higher horsepower, torque, and track-oriented features.
What are the common issues with the B58 engine?
The B58 engine is generally reliable but may experience issues like coolant leaks or fuel injector problems, especially with high mileage.
Are there any common problems with the S58 engine?
The S58 engine is relatively new, but some owners have reported issues with turbocharger reliability under heavy usage.
How fuel-efficient are the B58 and S58 engines?
The B58 is more fuel-efficient, delivering around 25-30 MPG depending on the model. The S58, being a performance engine, achieves slightly lower fuel efficiency at around 20-25 MPG.
