Early iterations of the 5.7-liter HEMI available in Ram 1500, 2500, and 3500 pickup trucks produced around 345 horsepower with 375 lb ft of torque. Other Chrysler products received a 335-horsepower version, but by 2008 the Chrysler 300C, Dodge Magnum R/T, and Charger R/T 5.7-liter HEMI powered vehicles received a power bump to 340 or 350 horsepower depending on the model.
By 2010, the 5.7-liter HEMI output increased to 390 horsepower and 407 lb ft of torque. In 2019, Ram introduced the eTorque 48-volt mild hybrid 5.7-liter HEMI. While power from either the standard 5.7 HEMI or the eTorque version was rated at 395 horsepower and 410 lb ft of torque, the combined fuel economy of the eTorque version jumped to 23 mpg, a 4-mpg increase over the standard 5.7-liter HEMI.
If you need more horsepower but don’t want to do an engine swap, you could add a supercharger to your 5.7-liter HEMI. Hemispherical engines are notorious for responding to boost. It’s one of the reasons the Hellcat HEMI is so powerful. A bolt-on supercharger from a company like ProCharger can add up to 160 horsepower to your 5.7-liter HEMI using premium pump gasoline with only 7 psi of boost.
Of course, increased horsepower usually has a negative impact on fuel economy, especially in a full-size pickup truck. So, whether or not you add a supercharger, you could benefit from these simple tricks to increase the fuel efficiency of your HEMI.
