The 2025 Chevy Corvette ZR1 is powered by an innovative 5.5-liter twin-turbo DOHC flat-plane crank V8 engine, known as the LT7. This remarkable engine draws inspiration from the Small Block Gemini Architecture, originating from the LT6 program, and takes Corvette’s performance to new heights. An optional ZTK Performance Package enhances handling and grip, incorporating stiffer springs and Michelin Pilot Sport Cup 2 R tires.
Long Live the King
Chevrolet has aptly named the 2025 Corvette ZR1 the “King of the Hill,” carrying on a legacy first established in 1990 with the C4 Corvette ZR-1. This earlier model, equipped with an LT5 V8 engine, ZF six-speed transmission, and FX3 Bilstein adaptive suspension, competed with Ferrari Testarossa and Lamborghini Countach in its era.
Fast forward 35 years, and the 2025 Corvette ZR1 boasts a twin-turbo LT7 engine, an eight-speed dual-clutch transmission, and the aggressive ZTK package. Just as the C4 ZR-1 redefined the 1990s supercar scene, the 2025 ZR1 rewrites the performance playbook for the modern era, offering exceptional capability at a relatively accessible price.
“The team that revolutionized Corvette with a mid-engine architecture took on another challenge: take ZR1 to the next level,” said Scott Bell, Vice President of Chevrolet. “Corvette ZR1 is about pushing the envelope with raw power and cutting-edge innovation.”
LT7 Engine: Power and Performance
At the heart of the 2025 Corvette ZR1 is the 5.5-liter twin-turbo DOHC flat-plane crank V8, producing an astonishing 1,064 horsepower at 7,000 rpm and 828 lb-ft of torque at 6,000 rpm. This output surpasses the power of the 2023 Dodge Challenger SRT Demon 170 and eclipses the combined output of two LS7 engines.
General Motors estimates the ZR1’s quarter-mile time at under 10 seconds, with a top track speed exceeding 215 mph. Testing at the Milford Proving Ground showed the ZR1 outpacing the C7 ZR1, achieving a faster peak speed on its very first lap. At the Nürburgring, four drivers recorded speeds exceeding 200 mph during initial testing, positioning the ZR1 alongside elite brands like Porsche, Mercedes-AMG, and Lamborghini.
Small Block Gemini Architecture
The LT7 builds upon the naturally aspirated LT6 engine from the 2023 Corvette Z06, utilizing the same Small Block Gemini Architecture. Chevrolet tailored nearly every system for the turbocharged application, ensuring the LT7 could achieve unparalleled performance.
Key enhancements include:
- A new intake system designed for turbochargers.
- Unique head castings with optimized ports and larger combustion chambers.
- Anti-lag calibration for dynamic response.
- CNC-machined combustion chambers and port-specific exhaust designs.
- Dual mono-scroll turbochargers with electronic wastegates for quick responsiveness.
Upgraded Transmission and Fuel Delivery
To handle the LT7’s power, the eight-speed dual-clutch transmission received updates, including reinforced input shafts, shot-peened gears for increased strength, and enhanced oil management. Additionally, a secondary port fuel injection system supports the LT7’s higher output demands.
Aerodynamics and Cooling
Three key aerodynamic upgrades optimize airflow and cooling for the ZR1:
- A flow-through hood channels air to cool the intercooler while increasing front downforce.
- Carbon fiber side ducts improve rear brake cooling without limiting wheel travel.
- Carbon fiber inlets on the rear hatch help regulate turbo compressor inlet temperatures.
At maximum speed, the ZR1’s advanced carbon fiber aero package generates over 1,200 lbs. of downforce, ensuring exceptional stability and track performance.
Braking System
The ZR1’s carbon ceramic braking system, with front rotors measuring 15.7 inches and rear rotors at 15.4 inches, sets new benchmarks for Corvette performance. The braking system reduces component temperatures during intense track use, allowing the ZR1 to go from 80 to 200 mph and back to 80 mph in just 24.5 seconds—a significant improvement over its predecessors.
Chassis and ZTK Performance Package
Two setups are available for the 2025 ZR1, both featuring Magnetic Ride dampers:
- Standard Chassis: Balances on-road comfort with track-ready capabilities, featuring a smaller spoiler, carbon fiber front splitter, and aerodynamic enhancements.
- ZTK Performance Package: Designed for high-downforce performance, this package includes a carbon fiber rear wing, stiffer springs, and Michelin Pilot Sport Cup 2 R tires for unparalleled grip and cornering.
Return of the Split Rear Window
A design element cherished by Corvette enthusiasts, the split rear window, returns for the ZR1. Acting as a carbon fiber spine, this feature enhances heat extraction from the engine bay and pays homage to the C2 Corvette.
“We didn’t approach this decision lightly,” said Phil Zak, Executive Design Director of Chevrolet. “The ZR1 felt like the right time to bring the split window back.”
Customization and Availability
The 2025 Chevy Corvette ZR1 will be produced at GM’s Bowling Green Assembly Plant in Kentucky, where the LT7 engine will be hand-assembled by expert technicians.
Customization options include:
- New exterior colors such as Competition Yellow, Hysteria Purple, and Sebring Orange.
- Full-length racing stripes and brake caliper color options.
- Unique interior treatments, including a Habanero theme, Blue Stitch accents, and ZR1-specific badging.
Pricing and Legacy
As Corvette enters a new era, the 2025 ZR1 reaffirms its status as a world-class supercar. Chevrolet’s commitment to pushing the boundaries of design and engineering ensures that the ZR1 lives up to its title as the “King of the Hill.”
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