Browse
Log in / Register
Share
It’s been 16 years since Porsche unveiled the 918 Spyder, a decade and a half that reshaped the automotive landscape. That hybrid V-8 powertrain—combining an internal combustion engine with two electric motors for 887 hp—set the template for today’s hypercars. Electrification is now the standard method for boosting power, from the exotic stratosphere all the way down to the Toyota RAV4 Prime. Chevrolet joined the party with the 2024 Corvette E-Ray, then used the same hybrid components to turn the already insane 1064-hp ZR1 into the 1250-hp ZR1X. This story originally appeared in Volume 36 of Road & Track. Updated April 2025, we take a fresh look at how these two generations of hybrid performance compare.
The 918 Spyder on these pages is a nonsalable prototype still owned by Porsche, occasionally loaned out to keep it exercised. Its home base, the Porsche Cars North America headquarters in Atlanta, is less than a day’s drive from the Cherohala Skyway—a ribbon of asphalt that snakes through Georgia, Tennessee, and North Carolina. It’s as close to driving heaven as possible east of the Mississippi, with a high density of corners and light early-morning traffic. The views are spectacular, too.
This terrain showcases the benefits of hybrid power in an era when even a base Corvette Stingray is more than enough for the road. Both cars are easy, even friendly, to drive—but neither should be taken lightly. There are limits, and more than enough power to exceed them. The electric motor at each car’s front axle adds stability both on and off throttle, helping preserve a margin of safety.
Compared with its hair-trigger predecessor, the Carrera GT, the 918 Spyder is nearly domesticated. It shifts toward wieldy performance, unbelievable power in a chassis without nasty surprises. It retains some of the Carrera GT’s greatest assets, such as carbon-fiber construction and a race-derived engine. The 918’s 4.6-liter V-8 is similar to the one in the RS Spyder that won the ALMS championship from 2006 to 2008. That motorsport lineage appears in its free-revving character, 9150-rpm redline, and modest 398 lb-ft of peak torque. The high-voltage electric system compensates with instantaneous thrust: a 6.8-kWh battery pack feeds a 154-hp motor between the engine and dual-clutch transmission, plus a 127-hp motor for the front wheels. That’s enough for 12 miles of plug-in electric-only range.
The electric portion of the ZR1X’s powertrain plays a more accessory role, adding 186 hp to the 1067-hp twin-turbo V-8. Electric-only operation is limited to Shuttle and Stealth modes—great for sneaking out of a gated community. While the 918 puts its electric angle front and center, defaulting to hybrid operation at startup, the Corvette hides the vegetables. In terms of fuel economy, the Corvette deep-fries them: its EPA combined rating of 14 mpg earns a $2800 gas-guzzler tax, while the Porsche dodged that with 22 mpg combined.
With modern power comes modern heft. The ZR1X weighs nearly 320 pounds more than the 918 Spyder, additional mass more than offset by its extra power. The Corvette is fewer than four inches longer and three inches wider and taller than the 918. In terms of physical impressions, however, the Corvette seems much larger. You sit deep in the 918, the car wrapped around you so much that there’s no elegant way to exit. The ZR1X seat is mounted higher, closer to eye level with crossovers, easing ingress and egress but also dampening the sensation of speed. Slightly.
The Corvette is incomprehensibly fast. Zero to 60 passes in just 2.1 seconds, with 100 mph arriving less than two seconds later. Not that the 918 Spyder is much slower—a four-tenths deficit to 60 mph borders on imperceptible. If anything, the Porsche responds with more immediacy in scenarios where the Corvette is still building boost. The biggest subjective difference: in the Porsche, fully flooring the accelerator for a moment or two is manageable. In the Corvette, scenery blurs so quickly that the driver must think about braking before their foot hits the firewall.
Fortunately, the Corvette has all the brakes. The massive 10-caliper front, six-caliper rear carbon-ceramic discs—an upgrade from the standard ZR1’s units—are unflinchingly capable. In virtually any other context, the 918’s binders would be considered otherworldly powerful, but here they’re second place, with an occasional hint of electric regeneration coming through the pedal. The Corvette’s stopping power is aided by sticky Michelin Pilot Sport Cup 2 R tires (part of the $1500 ZTK Track Performance package) and downforce from the $10,495 Carbon Fiber Aero package. The 918’s Michelins lack the R designation and offer a smidge less grip but come up to temperature more quickly. On 50-degree mornings, even the tighter switchbacks along Cherohala require a concerted effort to warm up the ZR1X’s tires. When cold, there’s a numbness that masks the car’s abilities.
With tires in their temperature window, the Corvette’s steering becomes more articulate, conveying precisely how much grip is building through a corner. The ZR1X is pointier than the Porsche, more eager to turn in and change direction, aided by the aggressive camber setting revealed by an alignment report in the glove box. Yet at higher speeds, the Corvette feels more planted, glued to the tarmac in sweeping corners, where the Porsche starts to feel slightly light.
The 918’s heavier, more deliberate steering communicates more connection to the road. The lack of sound deadening means you hear all the mechanical noises alongside every stray piece of road grit flung off the tires—presumably by design. The noise and the cabin’s exposed carbon fiber remind you that the 918 is a true exotic. Most of the time this is thrilling, but trundling in Hybrid mode with the engine below 3000 rpm, the exhaust note does drone.
The Corvette offers more isolation and comfort, plus optional cooled seats, highlighting the yin and yang of accessible performance. A car that hides its power level as well as the ZR1X does is easy to enjoy in traffic or over a long trip, but somewhat mutes the purpose of all its capability.
Both cars handle rough roads brilliantly and are suitable for daily-driver use—which makes sense
