How much HP does a Dodge supercharger add?
The short answer is that Dodge’s factory superchargers typically add about 200–300 horsepower over the naturally aspirated variants, with total outputs ranging from roughly 707 hp on the Hellcat lineup to as high as 840 hp on the Demon under race-fuel conditions.
To understand this question in more detail, it helps to look at the current Dodge performance lineup, how the boost translates into horsepower, and how aftermarket options compare. The numbers vary by model, octane rating, and tuning, and Dodge’s high-performance family has evolved to push power in different ways over the years.
Understanding how a supercharger boosts horsepower
A roots-style or twin-screw supercharger compresses more air into the engine, allowing more fuel to be burned and increasing the engine’s horsepower. The result is a higher peak power figure, usually accompanied by stronger mid-range torque. The exact gain depends on boost pressure, engine displacement, fuel delivery, intercooling, and the octane of the fuel. In Dodge’s performance models, the same basic engine can produce very different horsepower levels depending on the blower size, calibration, and fuel used.
Factory Dodge supercharged horsepower by model
Below is a summary of the main modern Dodge supercharged models and how they stack up, using the naturally aspirated counterparts as a baseline where helpful.
- SRT Hellcat (challenger/charger, 707 hp): The original supercharged setup delivers about 222 hp more than the 6.4L naturally aspirated variant (about 485 hp in the 6.4L V8 family), with roughly 11 psi of boost. This is the entry point of the modern Dodge supercharged era.
- SRT Hellcat Redeye (challenger/charger, 797 hp): A higher-output version of the Hellcat with larger boost tuning and components, adding about 90 hp over the standard Hellcat configuration.
- Dodge Challenger/Charger SRT Demon (track-focused, 808 hp on 93 octane; 840 hp on race gas): The Demon uses a larger blower and more aggressive tuning, delivering roughly 101–133 hp more than the Hellcat configuration, depending on fuel and configuration.
In all cases, these numbers assume the engine is tuned for performance and run on appropriate fuel. Real-world horsepower can vary with fuel quality, altitude, air conditions, and drivetrain setup.
Aftermarket and alternative options
For owners seeking additional power outside the factory lineup, aftermarket supercharger kits are common. These kits typically supplement the stock power with a substantial gain, but the exact numbers depend on the engine, kit, boost level, fueling, and tuning. A typical range is as follows:
- Bolt-on kits for older or smaller-displacement Hemi engines (e.g., 5.7L) commonly add about 150–250 horsepower.
- Kits for the 6.4L (392) often yield roughly 200–300 extra horsepower, depending on boost and fueling improvements.
- High-boost setups on modern 6.2L and 6.2L-based engines can push total output well beyond 700 hp, but such builds require careful engine internals, fuel systems, cooling, and chassis upgrades.
As with factory packages, the actual gain is highly dependent on tuning, octane, and supporting modifications. Aftermarket work can affect warranty coverage and long-term reliability if not properly planned.
Considerations when increasing horsepower with a supercharger
Power upgrades come with trade-offs. You should consider fuel quality and octane requirements, cooling capacity (intercoolers), transmission and drivetrain strength, brake and suspension upgrades, and warranty implications. Operators should also be mindful of emissions regulations and local laws when modifying a vehicle’s powertrain. Professional tuning and dyno testing are essential to safely unlock the full potential of any supercharged Dodge.
The bottom line
In Dodge’s current lineup, a factory supercharger typically adds several hundred horsepower above the naturally aspirated variant, with total outputs spanning roughly 707 hp (Hellcat) to 840 hp (Demon) under the right conditions. Aftermarket routes can push even higher, though they require careful planning and supporting upgrades.
Summary
- Hellcat: ~707 hp with ~222 hp gain over the NA 6.4L baseline.
- Hellcat Redeye: ~797 hp, about +90 hp versus Hellcat.
- Demon: ~808 hp on 93 octane; ~840 hp on race gas, about +101 to +133 hp over Hellcat.
- Aftermarket kits generally add 150–300 hp for many setups, with higher figures possible at the cost of complexity and reliability.
