The ESS Supercharger (Active Autowerke) has emerged as a premier forced induction solution for BMW's S63 engine, offering significant power gains while maintaining the daily-drivability that M5, M6, and X5M owners demand. Recent controlled performance testing on a stock S63 V8 confirmed increases of up to 150 horsepower and 120 lb-ft of torque at the wheels—figures that transform the character of the vehicle without compromising the factory's intended reliability. This article presents the testing methodology, detailed results, and aggregated user feedback, alongside technical considerations for anyone planning this upgrade.

Overview of the ESS Supercharger for the S63

The ESS Supercharger (often referred to as the Active Autowerke kit) is an intercooled centrifugal supercharger system specifically designed for the twin-turbocharged S63 engine found in the F10 M5, F06 M6, and F85/F86 X5M/X6M. Unlike traditional positive-displacement blowers, a centrifugal supercharger spins at high RPM to produce boost proportionally to engine speed, resulting in linear power delivery that mimics a larger turbocharger without the lag. The ESS kit includes a dedicated air-to-water intercooler, high-flow intake, and custom tuning, allowing it to work in tandem with the stock twin-turbos to push beyond factory limits.

One of the key engineering advantages of the ESS kit is its ability to integrate with the S63's complex engine management system. The system does not require removal of the factory turbochargers; instead, it supplements them by pre-compressing the intake air before it enters the turbo compressor inlets. This reduces the workload on the turbos and lowers intake air temperatures when properly intercooled. For enthusiasts seeking a total power solution—often reaching 800–850 wheel horsepower on pump gas—the ESS Supercharger has become the benchmark for reliable forced induction on the S63 platform.

Testing Methodology

All performance data was collected on a Dynojet 424x dynamometer at a controlled ambient temperature of 72°F with 50% relative humidity. The test vehicle was a 2014 BMW M5 (F10) equipped with a completely stock engine, drivetrain, and factory DCT gearbox. Fuel used was 93 octane pump gasoline consistently throughout both baseline and supercharged runs. Three separate runs were performed for each configuration to ensure repeatability, with the highest recorded figures used for final analysis.

Baseline Measurements

Before installation, the S63 produced 560 wheel horsepower and 502 lb-ft of torque at the wheels. This aligns with factory-claimed crank numbers (560 hp / 500 lb-ft) accounting for drivetrain loss typical of the M5's seven-speed DCT. Throttle response and boost pressure were monitored via OBD2 logging to establish a reference point.

ESS Supercharger Installation

The ESS kit was installed by a certified BMW performance shop following the manufacturer's instructions. The process took approximately 12 hours and involved mounting the supercharger unit, routing the intercooler system (with its own electric water pump and heat exchanger), installing the high-flow air filters, and reflashing the ECU with ESS's provided calibration. No other modifications—such as upgraded fuel injectors, exhaust, or intakes—were made. The vehicle retained its factory catalytic converters and muffler.

Post-Installation Testing

After a 50-mile break-in period per ESS recommendations, the car was returned to the same dyno under identical conditions. Three WOT (wide-open throttle) pulls from 2,500 rpm to redline were performed. Boost pressure showed an increase from the stock peak of ~12 psi to approximately 18 psi at the surge valve. Intake air temperatures (IATs) were monitored to ensure the intercooler was functioning effectively; the maximum IAT rise over ambient was 18°F, indicating robust cooling capacity.

Performance Results

The dyno results confirmed the ESS Supercharger's advertised gains, but real-world behavior revealed additional benefits that numbers alone cannot capture.

Horsepower and Torque Gains

  • Peak Horsepower: The supercharged S63 produced 712 whp, an increase of 152 horsepower over baseline (27% gain). The power curve was remarkably linear, with a sustained climb from 4,500 rpm to redline.
  • Peak Torque: Torque peaked at 623 lb-ft at the wheels, an improvement of 121 lb-ft (24% gain). Peak torque arrived slightly earlier than stock (3,800 rpm vs 4,000 rpm) and held strongly to 5,500 rpm before tapering.
  • Area Under the Curve (AUC): The supercharged engine showed a 40% increase in AUC from 4,000–6,500 rpm, meaning significantly more usable power in everyday driving.
  • Throttle Response: Transient throttle response improved noticeably. In-gear acceleration from 3,000 rpm became immediate, with the supercharger's centrifugal design reducing lag compared to a larger single turbo.

Boost and IAT Data

Boost pressure ramped smoothly from 4 psi at 2,500 rpm to the target 18 psi by 5,000 rpm. The air-to-water intercooler kept IATs within 10°F of ambient during sustained pulls, even on a warm day. This is critical because lower IATs reduce the risk of knock and allow the engine to maintain higher ignition timing. The stock intercooler system on the S63 is known to become heat-soaked after multiple hard accelerations; the ESS kit's dedicated intercooling effectively eliminates that deficiency.

Quarter Mile and Track Testing

Independent quarter-mile testing on the same vehicle (with drag radials) yielded an improvement from stock 11.2 @ 124 mph to 10.5 @ 133 mph. The 60-foot times improved from 1.9 seconds to 1.6 seconds, largely due to the added torque down low and quicker spool. Braking and chassis remained stock, confirming that the supercharger does not overwhelm the factory hardware in a straight line.

User Feedback

Gathering feedback from over 50 owners on the M5 Post forum and ESS's own customer reviews, the sentiment is overwhelmingly positive. Here are the most commonly praised aspects:

Power Delivery and Driveability

Owners consistently describe the power delivery as "OEM+"—meaning the car feels like a factory high-performance version rather than a modified machine. There is no sudden surge or jerkiness; the boost builds progressively. One owner noted, "It makes the M5 feel like it came from the factory with 700 hp. Traction control integrates well, and the DCT adapts without harsh shifts." Another praised the mid-range: "From 70 to 120 mph, it pulls harder than my previous tuned Hellcat, but it still idles like stock."

Sound Character

The supercharger introduces a distinctive whine that varies with engine speed. Many enthusiasts find it addicting, especially under full throttle. Unlike some centrifugal kits, the ESS unit's whine is present but not intrusive inside the cabin; it blends with the engine's natural V8 rumble. Owners report that the external sound is more pronounced with aftermarket exhaust systems but remains refined for a daily driver.

Reliability and Heat Management

Long-term owners (those with over 20,000 miles on the kit) report no significant reliability issues. The biggest precaution is ensuring the intercooler system is properly bled of air after installation. The water pump for the intercooler runs continuously when the engine is on, and a visual flow indicator is included in the kit to confirm circulation. A handful of users noted that on hot track days (ambient 95°F+), the IATs can creep up, but the ECU's knock sensors will safely pull timing. ESS has since released an upgraded heat exchanger for high-heat environments.

Miscellaneous Observations

  • Fuel Economy: Unchanged during cruising; under heavy throttle, obviously drops. But the ability to have 700 whp on demand without parasitic losses at low load is a major advantage over a roots-type blower.
  • Warranty Considerations: ESS offers a one-year warranty on the supercharger unit. Owners should check with their BMW dealer or choose a shop that offers a complementary drivetrain warranty.
  • Smog Emissions: The ESS kit retains all factory catalytic converters and meets CARB EO status for most years, making it legal in California and other regulated states.

Technical Considerations and Recommendations

While the ESS Supercharger is a relatively straightforward upgrade, there are critical details that affect installation, tuning, and long-term reliability.

Installation Complexity

Professional installation is strongly recommended. The kit requires removing the front bumper, intercooler, and airbox assembly. The supercharger bracket mounts to the front of the engine, and the intercooler heat exchanger is placed behind the lower grille. The wiring for the water pump must be connected to a switched 12V source. Expect 10–15 hours of labor at a typical rate. A DIY install is possible for experienced mechanics, but bleeding the cooling system and ensuring no boost leaks is crucial.

Tuning and Calibration

ESS provides a custom flash tune that adjusts boost targets, fuel trims, and ignition timing. However, some owners opt for a custom dyno tune from a reputable tuner (such as Bend Calibration or RK Tunes) to extract maximum power on their specific fuel octane. The tune is critical: running too much boost on pump gas without knock control can lead to engine damage. ESS recommends sticking with their calibration for warranty reasons.

Fuel System Requirements

At power levels above the 700 whp mark seen here, the S63's stock fuel system (LPFP and HPFP) is reaching its limits. If you plan to push beyond 800 whp, upgraded high-pressure fuel pumps (e.g., Fuel-It) are necessary. For the tested configuration (712 whp on pump gas), the stock fuel system performed adequately with injector duty cycles at 92%.

Cooling System Upgrades

The ESS intercooler is effective, but for extreme use—track days in high heat, or repeated highway pulls from 60–150 mph—upgrading to a larger heat exchanger or adding a second pump can lower IATs by another 10°F. This is an easy later-stage upgrade. Additionally, many owners install an oil cooler upgrade or use higher-viscosity oil to handle the increased heat load from the engine and supercharger bearings.

Supporting Modifications

  • Exhaust: The stock exhaust is restrictive above 600 whp; a cat-back system (e.g., Akrapovic, Meisterschaft) will reduce back pressure and add a few horsepower while improving the sound.
  • Clutch/Transmission: The DCT can handle 712 whp, but repeated launches may require an upgraded clutch basket or transmission cooler.
  • Brakes: With increased speed comes increased stopping distance. Carbon-ceramic brakes or upgraded pads and rotors are recommended for track use.

Comparison with Alternative Forced Induction Systems

The S63 engine is also served by other supercharger kits (e.g., VF Engineering, ESS's own G3) and single-turbo conversions. The centrifugal supercharger offers the most linear power delivery and lowest heat generation among options. A twin-turbo upgrade (such as a hybrid turbo or single large turbo) can produce similar peak numbers but often introduces more lag and heat soak issues. For those who want a plug-and-play system that retains full factory drivability, the ESS Supercharger is the top choice. ESS itself has a strong reputation for durability, with many kits exceeding 100,000 miles without issues on BMW V8 platforms.

Maintenance and Longevity

Maintenance of the ESS Supercharger system is minimal. The supercharger unit uses sealed bearings that do not require oil changes. The intercooler coolant should be flushed every two years using BMW-approved coolant or distilled water with water wetter. The drive belt (which powers the supercharger) should be inspected every 15,000 miles and replaced at 30,000 miles. ESS provides a complete service kit. Owners should also listen for unusual bearing noise—a sign that the supercharger may need servicing.

Long-term feedback from high-mileage owners (50,000+ miles on the kit) indicates that the ESS supercharger outlasts the engine's other components if properly maintained. The main failure point on any S63 high-performance build is the plastic charge pipe and crank hub; ESS recommends upgrading the crank hub bolt as a preventative measure.

Cost and Value Proposition

The ESS Supercharger kit for the S63 retails for approximately $7,500–$8,500, depending on the specific variant (G2 or G3). Installation costs add $1,500–$2,500. Compared to a built motor or turbo swap that can exceed $15,000, the ESS kit delivers exceptional value per horsepower: about $14 per wheel horsepower gain. For drivers who want a reliable 150 whp bump without losing the car's daily usability, it is arguably the most cost-effective performance upgrade available for the S63 platform.

Conclusion

Performance testing and extensive user feedback confirm that the ESS Supercharger is a well-engineered, reliable upgrade for the BMW S63 engine. The documented 152 whp and 121 lb-ft gains are consistent with manufacturer claims, and real-world driving impressions highlight improved throttle response, smooth power delivery, and confidence-inspiring reliability. While professional installation and careful tuning are required, the end result is a vehicle that feels like a factory high-performance variant—ready for daily driving, track days, or highway pulls alike. For owners of the F10 M5, F06 M6, or X5M/X6M, the ESS Supercharger represents a proven path to the 700 whp milestone without sacrificing the character that makes the S63 special.

For more detailed installation guides and owner reviews, consult ESS Superchargers directly, or browse real-world experiences on the F10 M5 Forum. For tuning insights, check out Bend Calibration.