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The next Porsche Boxster and Cayman will feature a new flat-four turbo engine as the firm focuses on improving efficiency and reducing cost.

New videos showing the updated Porsche Cayman testing at the Nurburgring indicate that Porsche’s entry-level baby coupe will lose its naturally aspirated flat-six engine in favour of a turbocharged flat-four motor.

This means its entry-level 2.7-litre Boxster convertible sibling will also get the revised engine line-up, which could appear in the car from as early as next year.

Turbocharging to help fuel economy 

Porsche chief executive officer Matthias Muller confirmed earlier this year that the firm was working on a new flat-four engine to improve fuel economy.

Speaking to German magazine Auto Motor und Sport, Muller said: “We will not separate ourselves from efforts to reduce CO2.”

It seems as though Porsche will not separate itself from performance either – when asked, Muller outlined that the new four-cylinder engine range in the Boxster and Cayman could produce up to 395hp.

Alongside the downsizing strategy, a power output this high suggests forced induction for the new flat-four, helping to improve efficiency and reduce CO2 emissions across the range.

Porsche goes turbo – again 

Porsche has long had an association with turbocharging – in fact, the word “turbo” is synonymous with the iconic forced-fed 911; the original all-weather supercar.

It seems that association could grow even stronger for the companies next generation of models.

Not only will the next 911 be available as a turbo only – the base Carrera model could use a 2.9-litre flat-six turbo, while the GT3 will remain naturally aspirated – its smaller siblings, the Boxster and Cayman, will use similar technology.

We are family: modular engines 

In a bid to keep costs down, Porsche’s new engine family is of a modular design, meaning the flat-four will in effect be two thirds of the larger six-cylinder motor.

Sharing parts will help reduce both cost and complexity, meaning you might be able to get into a next-generation Boxster or Cayman for less than £35,000.

The new four-cylinder turbo unit was thought to go as low as 1.6-litres in size and set to power a baby Boxster sports car.

However, Porsche has revealed that there will be no new entry-level two-seater in the range, meaning the smallest engine will likely be a 2.0-litre unit.