The 2018 Dodge Challenger SRT Demon’s 6.2-liter supercharged HEMI® Demon V-8 engine.
Powered by an 840-horsepower, supercharged 6.2-liter HEMI® Demon V-8, the limited-production 2018 Challenger SRT Demon is the world’s most powerful factory-production V-8 – bar none. NHRA-certified 9.65 seconds @ 140 mph makes the Dodge Challenger SRT Demon the fastest ¼-mile car in the world.
“With Demon, our goal was to build a car that would tattoo the Dodge logo into the subconscious of the general market, beyond even our loyal enthusiasts, said Tim Kuniskis, Head of Passenger Cars – Dodge, SRT, Chrysler and FIAT, FCA North America. “To do so, we had to set records that have never been set before, do more than has ever been done before, go beyond even the legendary Hellcat. The result: an 840-horsepower, 9-second muscle car, unlike anything that has ever come before it.”
Demon’s Supercharged V-8 Heart
The heart of the 2018 Dodge Challenger SRT Demon is the supercharged 6.2-liter HEMI Demon V-8, rated at 840 horsepower and 770 pounds-feet of torque. The red-painted Demon engine has been certified to the SAE J1349 industry standard for its horsepower and torque ratings. The engine also meets all applicable legal emissions regulations.
While the Demon V-8 shares its architecture with the 707-hp 6.2-liter supercharged HEMI Hellcat V-8, it is not simply a Hellcat engine with more boost. The Demon V-8 engine has 25 major component upgrades from the Hellcat engine, including supercharger, pistons, rods, valve train, and fuel injection system.
Among the changes, compared with the Hellcat V-8, the Demon’s supercharged V-8 features:
Larger supercharger: 2.7 liters versus 2.4 liters
Increased boost pressure: 14.5 psi versus 11.6 psi
Higher rpm limit: 6,500 rpm versus 6,200 rpm
Fuel: Two dual-stage fuel pumps versus one
Larger induction air box with three sources of intake air: Air-Grabber™ hood, driver-side Air-Catcher™ headlamp, and an inlet near the wheel liner
In addition, the HEMI Demon V-8 includes a high-speed valvetrain, strengthened connecting rods and pistons, and improved lubrication system. The upgrades enable the engine to sustain higher output and pressures while meeting FCA US LLC’s stringent durability requirements.
The 2018 Dodge Challenger SRT Demon’s standard Air-Grabber™ intake system features a significantly larger air box that is sealed and ducted to the hood scoop.
One key to the Challenger SRT Demon’s best-ever power output is air – the supercharged Demon V-8 takes in plenty of it. The SRT Demon’s Air-Grabber™ hood includes the largest functional hood scoop (45.2 square inches) of any production car.
The Air-Grabber™ hood is sealed to the air box, which is also fed from the driver-side Air-Catcher™ headlamp and an inlet near the wheel liner. Combined, those sources give the Demon V-8 an air-flow rate of 1,150 cubic feet per minute, 18 percent greater than the Hellcat V-8 and the largest air induction volume of any production car. The additional air inlets help reduce the temperature of the intake air by more than 30 degrees Fahrenheit compared with the Hellcat V-8, which improves overall throttle response.
During a quarter-mile run, the Demon V-8 ingests 173 cubic feet of air. That’s equivalent to the lung capacity of 816 humans.
The 2018 Dodge Challenger SRT Demon is the first-ever, factory-production car with the SRT Power Chiller™, a liquid-to-air charge air cooler chiller system.
Heat is the enemy of speed at the drag strip, so Dodge//SRT engineers looked for more ways to keep the intake air as close to the optimum temperature as possible.
The innovative SRT Power Chiller™ is a production car first. It diverts the air-conditioning refrigerant from the SRT Demon’s interior to a chiller unit mounted by the low-temperature circuit coolant pump. Charge air coolant, after being cooled by ambient air passing through a low-temperature radiator at the front of the vehicle, flows through the chiller unit, where it is further cooled. The chilled coolant then flows to the heat exchangers in the supercharger.
Demon V-8 cooling system rejects 258 kW of heat at rated power – that would boil 1 quart of water at room temperature in 1.2 seconds. The heat rejected is equal to 250 electric toasters.
Every run down the drag strip generates plenty of heat. The After-Run Chiller, a factory-production car first, helps the SRT Demon get ready for the next run as quickly as possible.
When the engine is shut down, the After-Run Chiller keeps the engine cooling fan and low-temperature circuit coolant pump running to lower the supercharger/charge air cooler temperature, helping the Challenger SRT Demon minimize heat soak effects. The impact of the SRT Power Chiller™ and After-Run Chiller, combined, lowers intake air temperature by up to 45 degrees Fahrenheit.
The driver can track the supercharger coolant temperature on the 8.4-inch Uconnect touchscreen in the instrument panel, and know in real time when the supercharger is at the optimum temperature for another run.
The limited-production (3,000 United States/300 Canada), 840-horsepower Dodge Challenger SRT Demon is due to start arriving in dealerships this fall.
The 2018 Dodge Challenger SRT Demon starts at a U.S. Manufacturer’s Suggested Retail Price (MSRP) of $84,995 (including $1,700 gas guzzler tax, excluding $1,095 destination). Challenger SRT Demon owners who want to unleash its full potential at the drag strip – and its full 840 horsepower and 770 lb.-ft. of torque – can do so with the addition of the exclusive Demon Crate – a collection of performance parts valued at $6,140, but available to Challenger SRT Demon owners for $1 (MSRP).