Let’s start with the Demon first since it technically has seniority over the Redeye Hellcat. It first burst onto the scene in April of 2017 at the New York Auto Show, making some really wild promises, like having a 1-second sprint time from zero to 30 mph (48 kph), a zero to 60 mph (96 kph) time of just 2.3 seconds (or 2 seconds flat with a rollout), and completing a quarter-mile in just 9.65 seconds at 140.09 mph (225.45 kph).
When it launched, the Demon was the fastest non-electric production car in terms of 0-60 times and quarter-mile times.
In order to get there, Dodge needed to work a little bit on the 6.2-liter supercharged Hemi V8 unit, which uses a 2.7-liter supercharger for a total of 840 hp (852 PS) and 770 lb-ft (1,044 Nm) of torque on 100 octane racing fuel or higher. Opting for a lower octane figure would leave you with “just” 808 hp (819 PS) and 717 lb-ft (972 Nm) of torque.
Meanwhile, the Hellcat Redeye is mostly just a stronger Hellcat, or a less powerful Demon, depending on how you look at it. It's got the same engine but rated at 797 hp (808 PS) and 707 lb-ft (959 Nm) of torque. It also packs a reinforced 8-speed automatic gearbox, track-tuned suspension, heavy-duty drive-shafts, and a few other upgrades.
Thanks to its Demon Crate, the Challenger Demon is a little better prepared for drag racing, but even if you don’t use the crate, you still have more power at your disposal, which is why the Demon beat the Hellcat Redeye during this race. The Demon ran the quarter mine in 10.17 seconds, while the Redeye needed 10.52 seconds. Awesome stuff.