By Sue Taylor 
Among BMW’s family of turbocharged engines, the N63 often sits in the shadows of its more famous siblings like the N54 and S63. Yet, ask any true BMW enthusiast or tuner, and they’ll tell you the N63 is one of the most underrated engines the brand has ever produced. This twin-turbo V8, found in models like the 550i, 750i, and X5, has all the ingredients of a performance masterpiece—massive power potential, advanced engineering, and smooth power delivery. At Rvng RaceWorks, we consider the N63 a true hidden gem, capable of astonishing performance when treated with the right upgrades and tuning.
The Evolution of the N63 Engine
When BMW introduced the N63 in 2008, it marked a major technological leap. It was the first production engine to use the “hot-vee” turbocharger layout—placing both turbos inside the engine’s V. This design shortened the exhaust path, reduced turbo lag, and made the engine more compact.
Over the years, BMW refined the design through several iterations:
- N63 (2008–2013): The original version powering the early 550i and 750i.
- N63TU (2013–2016): Added improved cooling, variable valve lift, and better reliability.
- N63TU2/TU3 (2016–present): Introduced higher compression, lighter internals, and up to 523 hp from the factory.
Each generation built upon the strengths of the last, making the N63 not just powerful—but more reliable and tunable than ever before.
Why the N63 Is So Special
1. Instant Power Delivery
The N63’s hot-vee layout gives it nearly instant turbo response. Unlike older turbocharged engines that need time to spool, the N63 delivers torque almost immediately. This design makes it one of the most responsive twin-turbo V8s in its class.
2. Smoothness Meets Brutality
While the N63 can produce massive torque, it does so with BMW’s trademark refinement. You can cruise comfortably one moment and unleash spine-compressing acceleration the next—all with buttery-smooth delivery.
3. Huge Tuning Potential
Even in stock form, the N63 offers impressive performance. But with tuning, it transforms into a monster. Proper N63 tuning can easily extract an additional 120–160 horsepower. Combined with supporting mods, total output can surpass 650 hp—all while maintaining OEM drivability.
4. Understated Performance
Unlike the S63, which powers M models, the N63 flies under the radar. It’s the ultimate sleeper engine—quietly lurking inside executive sedans and SUVs that don’t scream “race car,” but move like one.
The Power Potential of the N63
At Rvng RaceWorks, we’ve unlocked incredible performance from the N63 platform. Here’s what you can expect with proper tuning and upgrades:
- Stage 1 Tune: +80–100 hp / +100 lb-ft of torque
- Stage 2 Tune (with downpipes and intercoolers): +150 hp / +150–200 lb-ft
- Upgraded Turbos and Fueling: 700+ hp capable
The beauty of the N63 lies in its flexibility. You can build a reliable daily driver or a full-on street savage capable of supercar-level performance—all from the same base engine.
Common Misconceptions About the N63
Despite its strengths, the N63 has faced criticism for early reliability issues. However, most of those problems stemmed from the first-generation engines and can now be easily resolved.
Myth 1: “The N63 Is Unreliable.”
Fact: Later versions (N63TU and beyond) have vastly improved components—better timing chains, upgraded seals, and improved PCV systems. With regular maintenance and quality oil changes, these engines are incredibly durable.
Myth 2: “The N63 Can’t Be Tuned Safely.”
Fact: With proper tuning from experts like Rvng RaceWorks, N63 tuning is both safe and highly rewarding. Modern ECU management allows precise control of boost, timing, and fuel for reliable power gains.
Myth 3: “It’s Not an M Engine.”
Fact: True—but that’s part of its appeal. The N63 shares much of its architecture with the S63, BMW’s M-division monster. With the right upgrades, it can perform nearly as well—without the M-car price tag.
Upgrades That Unlock the N63’s Hidden Power
To turn the N63 into a true performance gem, focus on these key upgrades:
1. ECU Tune
A custom tune adjusts boost, timing, and fueling to deliver massive gains in both power and throttle response.
2. Downpipes and Exhaust System
Free up exhaust flow, improve turbo efficiency, and bring out that signature V8 growl.
3. Intercoolers and Cooling Enhancements
Lower intake temperatures and prevent heat soak—critical for reliability at higher power levels.
4. Intake and Turbo Inlets
Improve airflow to the turbos, allowing them to spool faster and build boost more efficiently.
5. Maintenance and Reliability Upgrades
Upgraded PCV systems, oil catch cans, and better valve seals help keep the N63 performing at its peak for years.
At Rvng RaceWorks, we design upgrade packages that enhance both performance and longevity—because true power means nothing without reliability.
Driving Experience: Effortless Domination
What sets the N63 apart isn’t just numbers—it’s how it delivers them. The effortless surge of torque, the linear acceleration, and the seamless transitions between gears create a driving experience that feels both luxurious and ferocious. Whether it’s a long highway pull or a short sprint from a red light, the N63 responds instantly, making every drive addictive.
When paired with an upgraded exhaust and tuned transmission, the car transforms into a refined monster—one that can silence skeptics the moment you press the throttle.
Why Enthusiasts Love the N63
BMW enthusiasts are drawn to the N63 because it offers the best of both worlds—comfort and chaos. You can daily drive it in total silence, or unleash it for raw, tire-shredding performance. Its potential for modification makes it a favorite among tuners who appreciate understated power.
Unlike smaller turbo engines, the N63 delivers that unmistakable V8 feel—deep, throaty, and brutally strong. And when properly tuned, it offers performance rivaling even M-series models, but with a stealthy edge.
Why Rvng RaceWorks Trusts the N63
At Rvng RaceWorks, we’ve spent years refining the N63 platform. From ECU calibrations to full engine builds, we understand what it takes to make this twin-turbo V8 both fast and reliable. Our philosophy is simple: extract every ounce of potential while keeping your BMW smooth, durable, and exhilarating.
We treat each N63 as more than just an engine—it’s a foundation for performance artistry. Whether you’re seeking a custom tune, upgraded turbo setup, or a full street build, we ensure your car performs flawlessly.
Conclusion
The N63 might not wear the M badge, but it embodies everything BMW performance stands for—precision, power, and poise. With smart upgrades and expert tuning, it becomes one of the most capable and rewarding engines in BMW’s history. At Rvng RaceWorks, we see the N63 not as an underdog, but as a hidden gem waiting to shine. So if you’re ready to experience true twin-turbo V8 greatness, it’s time to unlock the full potential of your N63—and discover the power that’s been hiding beneath your hood all along.