How much HP is in a 5.7 Hemi?
A 5.7 Hemi typically produces about 345 horsepower in classic, non-hybrid versions and up to roughly 395 horsepower in the latest mild-hybrid eTorque variants.
Overview of the 5.7 Hemi
The 5.7-liter Hemi V8 is a long-standing engine used across Ram trucks, Dodge Chargers and Challengers, and Jeep Grand Cherokees. It delivers solid low-end torque and, in newer applications, benefits from a 48-volt mild-hybrid system known as eTorque to improve efficiency and response. Horsepower has varied by year, model, and configuration, so exact output depends on the specific vehicle.
HP by variant and year
Below is a snapshot of typical horsepower figures by major variant and era. Exact output depends on model, calibration, and drivetrain.
- Classic 5.7 Hemi (early 2000s through the pre-eTorque era): about 345 horsepower, with torque generally around 375 lb-ft.
- 5.7 Hemi in mid-2010s Dodge/Jeep applications (non-hybrid): commonly cited in the 360–370 horsepower range depending on the model and year.
- 5.7 Hemi with eTorque mild-hybrid (2019–present, including Ram 1500 and select Jeeps/Dodges): 395 horsepower, approximately 410 lb-ft of torque.
Notes: Some model lines and calibrations vary; always verify the exact specification for your vehicle’s VIN or official brochure. The horsepower numbers reflect the common outputs for these configurations as of the latest model years.
Model-specific notes
- Ram 1500 trucks with the eTorque system tend to be the most frequently cited modern peak at about 395 hp.
- Jeep Grand Cherokee with a 5.7 Hemi generally sits around 360 hp in older configurations.
- Charger and Challenger RT variants commonly fall in the 370 hp range without hybrid assistance.
Summary
How much HP is a 6.4 HEMI?
The horsepower for a 6.4L HEMI engine varies by application, but it is generally in the range of 405 to 485 horsepower. For use in Ram 2500 trucks, the 6.4L HEMI produces 405 horsepower, while applications in Dodge vehicles like the Challenger produce a higher output of 485 horsepower.
Ram 2500 and 3500 Trucks
- Horsepower: 405 hp @ 5,600 rpm
- Torque: 429 lb-ft @ 4,000 rpm
- Note: Older models may have a slightly different output, but the modern version is consistent.
Dodge Vehicles (e.g., Challenger SRT 392)
- Horsepower: 485 hp @ 6,100 rpm
- Torque: 475 lb-ft @ 4,100 rpm
How much HP does a tune add to a 5.7 HEMI?
A tune can add 5–15 horsepower to a stock 5.7L Hemi, with the potential for 10–20+ horsepower when combined with other modifications. A tune is most effective at optimizing performance for supporting modifications like headers, cold air intakes, and larger cams, or for a more efficient and responsive driving experience. For best results, a custom tune should be used with higher octane fuel, especially 91 or 93.
You can watch this video to learn how to build a 425 WHP 5.7 HEMI: 1m8020 AutomotiveYouTube · Sep 10, 2024
Typical horsepower gains
- Stock engine: Approximately 5–15 horsepower.
- With supporting modifications: 10–20+ horsepower is achievable.
- Custom tune with premium fuel: Can lead to significant gains, especially when supporting other mods.
Benefits of a tune
- Improved performance: A tune optimizes the air-to-fuel ratio and ignition timing, which improves overall performance.
- Increased efficiency: Correcting the air-to-fuel ratio can make the engine run more cleanly and efficiently.
- Enhanced throttle and transmission response: A tune can make the throttle feel more responsive and adjust the transmission's shift points for better performance.
- Optimized for modifications: Tuning is a crucial step to maximize the gains from other performance parts, such as headers and cold air intakes.
This video demonstrates the horsepower gain after using a Diablo tune: 51sR/T LifeYouTube · Apr 2, 2019
How to get the most out of a tune
- Use a performance tune: Look for tunes from reputable companies like Hemifever or for custom tunes to get the most out of your specific setup.
- Use high-octane fuel: Using 91 or 93 octane fuel is highly recommended and will result in greater power gains.
- Consider a cold air intake: A cold air intake can work well with a tune to add more horsepower.
- Add headers: Headers are a great way to improve exhaust flow, and a tune is essential to maximize the power gains from them.
How much HP will a supercharger add to a 5.7 HEMI?
Installing a ProCharger supercharger is an easy way to add up to 160 horsepower to a 5.7 HEMI without taking out a second mortgage on your house.
How much HP does a 5.7 HEMI really have?
395 horsepower
The 5.7 liter V8 HEMI makes 395 horsepower at 5,600 RPM. This puts it among the top engines in full-size trucks. The 5.7 HEMI max HP ensures you have extra power when needed. Torque is also impressive, at 410 lb-ft at 3,950 RPM.
