The Porsche Boxster and Cayman are brilliant sports cars, but they're not so different as the names might suggest — they’re basically the same car, aside from that minor roof thing. So why different names?
Indeed. This year, Porsche's debugging that situation by adding a new prefix. Meet the 718 Boxster and 718 Cayman, essentially similar cars to last year's models, now with a first name borrowed from an open-cockpit racing Porsche from the Eisenhower era.
This is not merely a throwback exercise, like putting Mountain Dew in vintage '70s cans. While the badges are being hot-swapped, so are new powertrains.
Wave goodbye to the flat-6, and say hello to a new turbocharged flat-4.
Is it heresy? Two fewer cylinders suggests these cars have lost something, maybe even their Porsche-ness? Doesn't Subaru make a turbo flat-4?
Take a peek at the spec sheet and the stopwatch, and you'll see the decision was a wise one. The noises coming from over the shoulder may sound quite different, and there's a spike in power that wasn't there last year, but the 718 is faster than the Boxster and Cayman S were just last year.
Fair trade? Fair trade.
Flat-4s and fancy footwork
The 718 actually comes in two forms. There’s a 2.0-liter turbo-4 with 300 horsepower and 280 pound-feet of torque; the S models come with a 2.5-liter turbo-4 with 350 horsepower and 309 lb-ft of torque. Both engines have 35 hp more than the outgoing sixes; the 2.0 has 74 lb-ft of torque more, while the 2.5 churns out an extra 43 lb-ft of torque.That's in a car weighing just under 3,000 pounds.
The basic architecture of the drivetrain is now the same as the 911, Porsche says, with many shared parts and technology. Between themselves, the flat-4 engines share a stroke, if not their bore. Peak torque shows up at 1,900 and 1,950 rpm, respectively. They redline at 7,590 rpm, just shy of the flat-6 engine's 7,800-rpm redline.
Both cars use airflow techniques that Porsche employs on the 911 Carrera turbo to keep the turbos on boil: the wastegate opens and closes to maintain airflow in on-off acceleration, so it takes less effort to spool the turbo when it's called to generate boost. The engines share a stop/start system that shuts off engine when braking, except when in in Sport or Sport+ mode.
Where they differ is inside the turbocharging package. The 2.5-liter engines have a variable-geometry turbocharger that helps them make more torque as they approach that peak, and dry-sump oil delivery so they won't starve after repeated laps on a track.
MORE: Read how Porsche gave the world more turbos, faster
Performance has gone from scalding to blistering. the 718 shreds 0-60 mph times even more successfully than it did under its maiden name. Whether you choose the manual or the dual-clutch. With the Sport Chrono package and Porsche’s 7-speed dual clutch transmission, the 718 Boxster will hit 60 mph in 4.5 seconds; the Boxster S, in 4.0 seconds. Those figures shave at least half a second off the flat-6 cars. Top speeds are 170 and 177 mph, respectively.
Those numbers are for the optional dual-clutch transmission; a 6-speed manual is the standard gearbox, and it's the positive, clean-shifting, feel-good manual it's always been. The new 7-speed paddle-shifted dual-clutch is the best of its kind; it creates virtual intermediate gears by engaging both its gearboxes and slipping both its clutches, in the name of better fuel economy.
The Sport Chrono Package carries over Normal, Sport, and Sport Plus modes, but now adds an Individual mode that lets drivers adjust the various vehicle systems to taste. A new Sport Response button for models with the dual-clutch sharpens the responsiveness of the engine and transmission. Think of it as a flash-to-pass button for the powertrain.
What's not to love? We've heard complaints about turbo lag on the base car, but that complaint is perception, not math. By the stopwatch, the 2.0-liter cars are faster than the old Boxster S and Cayman S cars with the naturally aspirated flat-6. That engine built torque more slowly and evenly; by the time the smaller flat-4 is barely off idle, it's only a thousand revs off peak torque. Compared to the 2.5-liter, the perception of turbo lag evaporates; the variable turbo vanes put that engine into an even steeper torque climb.
Noise is a fair complaint against the new engines. There's some more boom and rasp that comes with lopping two cylinders off a flat-6. But dial up the extreme exhaust noises from the 718's available sport exhaust and, trust us, the overrun noises make up the difference.