How Does The HEMI eTorque Engine Work?

Photo Source/Copyright: Stellantis

Have you ever wondered how Ram gets extra muscle out of its classic V-8 without sacrificing its legendary rumble? HEMI eTorque is Ram’s 5.7-liter HEMI V-8 paired with a 48-volt mild-hybrid system. In place of the engine-mounted alternator, a belt-driven motor generator unit supplies up to 130 pound-feet of supplemental torque on initial throttle tip-in. The system supplements the V-8 rather than replacing its character, and it operates automatically: the same big-displacement engine, with an electric assist working quietly alongside it; no plug required.

HEMI eTorque Specs at a Glance

The figures below cover what buyers ask about most. Towing and payload maximums are mutually exclusive, and both depend on cab, bed, drivetrain, and axle ratio.

One point deserves emphasis. The 130 pound-feet of torque figure is a supplemental assist delivered at initial throttle tip-in, not a combined crankshaft rating, and it should never be added to the 410 pound-feet of torque engine figure.

Behind the engine sits an eight-speed automatic transmission, and HEMI builds include a performance-tuned exhaust system and a 33-gallon fuel tank.

What is HEMI eTorque?

The 5.7-liter HEMI V-8 on its own produces 395 horsepower and 410 pound-feet of torque. eTorque is the mild-hybrid system built around it.

Unlike a full hybrid, it can’t move the truck on electric power alone; it assists the gasoline engine and recovers energy that would otherwise be lost during braking. Ram dropped the HEMI from the Ram 1500 lineup for the 2025 model year and brought it back for 2026, and the brand describes the pairing as a class-exclusive available V-8 hybrid.

How HEMI eTorque Works

The motor generator unit handles three jobs. It delivers quick, seamless engine start/stop, adds torque to the crankshaft under certain driving conditions, and captures brake energy through regeneration. It replaces the alternator rather than adding hardware, so the footprint stays modest.

• Motor generator unit → Belt-driven, replaces the engine-mounted alternator
• 48-volt architecture → Powers the motor generator and stores recovered energy
• 430-watt-hour lithium-ion battery → Air-cooled, in a noise-insulated enclosure behind the rear seat
• 3-kilowatt DC-to-DC converter → Steps 48 volts down to charge the 12-volt battery and run accessories

One detail sets the HEMI application apart from most hybrids: the engine retains a traditional starter motor for cold-weather starts. The motor generator handles routine restarts, while the conventional starter stays available when temperatures drop, and cranking demands rise.

What HEMI eTorque Means for Towing

Properly equipped, a HEMI eTorque Ram 1500 tows up to 11,320 pounds and carries a payload of up to 1,650 pounds, both rated under SAE J2807. The assist arrives where trailer work needs it: at initial throttle tip-in, easing launches, and low-speed maneuvering under load.

Regenerative braking recovers energy on descent. Variable-valve timing and Fuel Saver Technology cylinder deactivation work alongside eTorque, which smooths the transitions in and out of cylinder deactivation. Confirm any specific truck’s rating on the door jamb sticker.

HEMI eTorque in Everyday Driving

Away from the trailer, eTorque shows up as refinement. Restarts are quick and composed, shifts are enhanced, and transitions under acceleration and braking are smoothed, which reduces noise, vibration, and harshness.

The battery enclosure is air-cooled and internally vented with dual cooling fans, engineered to stay acoustically transparent to passengers. An 850-watt electric cooling fan uses pulse width modulation to match its energy draw to actual cooling demand, drawing only what the engine needs.

HEMI eTorque FAQ

Q: Does every HEMI V-8 Ram 1500 have eTorque?

A: No. Most HEMI-equipped Ram 1500 trims pair the 5.7-liter V-8 with eTorque, but the Rumble Bee muscle-truck configuration forgoes eTorque and stop/start entirely, matching its larger-displacement HEMI siblings.

Q: Is HEMI eTorque a full hybrid?

A: No. eTorque is a mild-hybrid system that assists the gasoline engine with supplemental torque and energy recovery. It can’t drive the truck on electric power alone the way a full hybrid does.

Q: Does eTorque replace the starter motor?

A: No. The 5.7-liter HEMI V-8 retains a conventional starter motor for cold-weather starts. The motor-generator unit handles routine start/stop cycles, while the traditional starter remains in place.

Find a HEMI eTorque Ram 1500

Ready to hear a HEMI V-8 for yourself? We can walk you through HEMI eTorque setups and schedule a test drive so you can feel the difference at launch and under load. Browse our Ram 1500 inventory or visit our showroom.