Demon vs Hellcat on the Dyno!

The same owner puts his Dodge Demon and Hellcat on the same dyno, on the same day, to finally settle which supercharged Hemi actually makes more power at the wheels. The numbers confirm Dodge’s engineering gap between the two cars, and the video hints there’s still more locked away in the Demon’s factory race-fuel mode. Demonology’s channel built its following on exactly this kind of head-to-head test.

Two of the most feared factory muscle cars Dodge ever built, owned by the same person, strapped to the same dyno on the same afternoon — that’s not a matchup manufacturers usually let happen, and it’s exactly what makes this video worth watching all the way through. The Demon and the Hellcat share a supercharged Hemi lineage, but Dodge built one specifically to out-muscle the other, and putting both on rollers back to back finally answers the question every Mopar fan has argued about since the Demon’s launch: on paper, at the wheels, stock versus stock, which one actually wins the fight it was built to win. Owning a Demon at all already puts someone in a small club, since Dodge built roughly 3,300 units for the entire 2018 model year, each one built to order. Owning a Demon and a Hellcat at the same time, and treating them like lab equipment instead of trophies, is rarer still.

Same Shop, Same Day, No Excuses

Demonology took both cars to Gear Heads Automotive & Performance for a single-session, apples-to-apples comparison — same dyno, same conditions, no gap in time or weather to blame for a discrepancy between the two runs. That kind of controlled back-to-back testing is rare in factory-versus-factory Hellcat content, where most comparisons online rely on manufacturer claims or separately recorded pulls filmed months apart that are difficult to trust against each other with any real confidence. Dyno numbers pulled weeks or months apart, on different equipment, in different weather and humidity, routinely swing by dozens of horsepower even on an identical car — which is exactly the kind of noise this single-session format is designed to eliminate entirely.

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The Numbers That Settled the Argument

The Hellcat put down 670.77 horsepower and 618.36 pound-feet of torque to the rear wheels on the day of the test. The Demon, in stock form, posted 704.05 horsepower and 676.20 pound-feet — a real, measurable gap that confirms Dodge’s engineering changes to the Demon’s supercharged 6.2-liter Hemi translate directly into more usable power at the wheels, not just a bigger number printed on a window sticker back at the dealership. Both figures line up closely with what Dodge itself claimed at launch for each car’s factory rear-wheel output, lending real credibility to a dyno session that could have easily been dismissed as another unverified internet number. Torque told an even bigger story than horsepower, with the Demon’s nearly 58 pound-foot advantage over the Hellcat translating directly into the kind of low-end shove that actually wins a stoplight launch.

What Actually Separates the Two Engines

Both cars share the same basic supercharged Hemi architecture, but the Demon’s factory-installed and factory-supported upgrades — including changes tied to its higher-boost calibration and stronger internal components — are built specifically to push past what the Hellcat’s tune allows without breaking anything. This dyno session puts a real, verifiable number on a gap that Dodge itself engineered into the car from the factory floor, rather than something an owner achieved later through aftermarket tuning or bolt-on parts. Chief among those changes is a stronger supercharger pulley setup and reinforced internals designed specifically to survive the Demon’s higher boost pressure, none of which the standard Hellcat received when it left the factory.

There’s More Left in the Demon

The video’s most interesting detail might be what comes after the numbers are already on the board: the owner notes plans to retest the Demon later with its unlocked PCM installed, high-octane race fuel, and a high-performance air filter — all changes Dodge engineered the car to accept without voiding anything, since the Demon was designed from day one with a dedicated race-fuel mode built directly into its factory tune. That means the 704-horsepower figure captured here isn’t even the car’s full factory ceiling once every legitimate option is unlocked. That race-fuel mode, unlocked through the same infotainment screen used for everything else in the cabin, was one of the more talked-about engineering decisions when the Demon first launched, since Dodge built an entire second calibration into a car sold with a factory warranty.

The Sound Viewers Keep Coming Back For

Comments on this video consistently single out one specific moment: the supercharger note as both cars spool up under load, described repeatedly as the standout audio of the whole session by longtime viewers. For an audience that’s watched dozens of Hellcat and Demon dyno pulls online over the years, that kind of reaction says something meaningful about how cleanly this particular session was captured and mixed compared to the usual shaky phone footage. Several commenters admit they’ve rewatched the spool-up moment on its own, isolated from the rest of the video, purely for the sound design of two supercharged Hemis loading up back to back.

A Channel Built Around Two Halo Cars

Demonology has built its audience specifically around documenting life with a Demon and Hellcat side by side, and this video is a clear example of why that format works so well for the channel. Most owners have one or the other, rarely both, and even fewer are willing to put them through the same controlled test back to back just to settle an argument that’s been running in comment sections since the Demon’s debut. That access alone gives the channel’s audience a level of direct comparison most owners, dealerships, and even Dodge’s own marketing materials rarely bother to provide in one place.

A Rivalry Dodge Built on Purpose

Dodge never pretended the Demon and Hellcat were meant to be equals — the Demon exists specifically to sit above it in the lineup as the halo car. What this video adds isn’t really a surprise so much as proof: a real, same-day, same-shop number confirming that the extra engineering Dodge poured into the Demon shows up exactly where it’s supposed to, right there on the rollers for anyone to see. For a segment of the internet that debates supercharged Hemi output endlessly without ever settling anything, that’s a rare thing to actually get on tape.

Check out the full video above and let us know what you think in the comments.

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