Hennessey’s Demon 1700 Delivers 1,355 HP at the Wheels—Outperforming Bugatti Chiron’s Crank Output

Hennessey’s Demon 1700 Hits the Dynamometer with Record-Breaking Power

Hennessey Performance Engineering first teased the Demon 1700 in 2024, following an engine dyno test that proved its 7.2-liter HEMI’s potential. Now, the twin-turbo build has completed chassis dyno testing, delivering its full output to the rear tires.

Street-Legal Monster Outperforms Supercars

The Demon 1700 is designed to embarrass nearly any production car on the road. With 1,355 horsepower (1,010 kW) and 1,202 lb-ft (1,630 Nm) of torque measured at the rear wheels, it outperforms the Bugatti Chiron’s crank-rated figures of 1,479 hp (1,103 kW) and 1,180 lb-ft (1,600 Nm).

Engineering a Powerhouse: Key Upgrades

To achieve this level of performance, Hennessey equipped the Demon 1700 with:

• Twin Precision PT6870 turbochargers
• New high-flow injectors
• Billet turbo wastegates and blow-off valves
• High-flow stainless exhaust
• Custom charge piping
• Twin-intercooled billet intake system
• Fully integrated turbo oil feed and drain setup

The car requires E85 fuel and up to 23 psi of boost to unlock its full potential.

Unanswered Questions: Will It Hit the 8-Second Quarter Mile?

Hennessey initially promised the Demon 1700 would run the quarter mile in under 8 seconds, targeting a 7.9-second pass at 175-180 mph (281-289 km/h). While the chassis dyno results confirm its power, Hennessey has not yet verified if the completed build meets this goal. If it does, expect a viral video to follow.

Jason Haynes, Chief Powertrain Technical Specialist:
"The engine dyno test proved the powertrain could make 1,700 horsepower at the crank. Now, the chassis dyno reveals what owners will experience at the contact patch."

Why the Demon 1700 Stands Out

The Demon 1700 isn’t just about raw numbers—it’s a street-legal machine designed to dominate. By measuring power at the wheels, Hennessey demonstrates its real-world performance, leaving even top-tier supercars in its wake.