The 718 Boxster is the first Porsche to be powered by a four-cylinder engine since the 968 ceased production in 1995. Development of the new unit was overseen by Wolfgang Hatz, the head of Porsche’s research and development operations suspended in the aftermath of parent company Volkswagen’s dieselgate affair.
The new engine is also earmarked to replace the existing flat six in the 718 Cayman.
With 296bhp and 280lb ft,
the 2.0-litre unit makes 25bhp and 66lb ft more than the naturally aspirated 2.7-litre flat six it replaces in the outgoing entry-level Porsche roadster.
Significantly, peak torque appears 1500rpm earlier in the rev range than with the old six-cylinder unit, leading to what Porsche describes as “added levels of low-end urge and greater mid-range flexibility”.
The 718 Boxster S
receives a larger, 2.5-litre variant of the flat four turbo powerplant in place of the naturally aspirated 3.4-litre six-cylinder unit currently used. With 345bhp and 310lb ft between 1900 and 4500rpm, the new engine offers a 25bhp increase in output over the
unit it replaces, along with a 37lb ft lift in torque.
As before, the most affordable of Porsche’s
sports car models offer the choice of a standard six-speed manual or optional seven-speed PDK dual-clutch automatic gearbox, the latter of which has been updated
with a new software package that’s said to provide added fuel-saving potential.
Porsche says the 718 Boxster has a 0-62mph time of 4.7sec and a 171mph top speed when fitted with the optional PDK gearbox, bettering its predecessor by 0.9sec and 5mph respectively.The 718 Boxster S has claimed figures of 4.2sec
and 177mph, in the process beating the official 0-62mph time of the 380bhp 3.8-litre
six-cylinder Cayman GT4
As well as providing added power, the new four-cylinder engine also brings a significant improvement in fuel economy over the outgoing six-cylinder engine. The 718 Boxster returns a claimed 40.9mpg on the combined cycle and the 718 Boxster S promises 38.7mpg in combination with the PDK gearbox, representing improvements of 5.1mpg and 4.2mpg respectively.
Along with the new engine, the 718 Boxster features what Porsche describes as a “sportier tuning of the chassis”. Among the changes is a revised electro-mechanical steering system that is said to be 10% more direct than the set-up used on the outgoing Boxsters. Porsche’s Active Suspension Management (PASM) continues to be offered as an option, offering a nominal 10mm reduction in ride height over the standard suspension.
Speaking to Autocar at the Geneva show, Porsche Boxster boss Stefan Weckbach confirmed that far higher states of tune are available on the new flat-four engine. "350hp is not the end of the engine," he said "There is plenty of room for more."
Despite there being scope to develop the new engine further, Weckbach said there are currently no plans for Porsche to install the unit into other models, including the 911. Observers have likened the sound of the unit to that of a Subaru WRC car. The exhaust note is amplified into the cabin, officials have confirmed, but no extra software is used to enhance its sound.
Read our first ride in the Porsche 718 Boxster