Porsche may have to yield to VW Group's demands in having a sport model based on an external architecture.

Note: Porsche 918 Spyder design sketch shown above

A new Porsche model, set to battle the likes of the Ferrari 458 Italia in the markeplace, will be based on the next-generation Audi R8 architecture, according to a report by Autocar.

Porsche has already been designated the sport model developer within the VW Group, but in this case the parent company has other plans. The new Porsche model will utilize a part-carbon fiber architecture that is already in an advanced stage of development and was debuted in the Audi R8 e-tron prototype which took to the floor at Frankfurt in September. The same architecture will also underpin the next Lamborghini Gallardo.

Porsche has already made clear its intention to enter this segment which would see a supercar slotted above the 911 but below the 918 model and be priced between €250,000 and €400,000.

The next-generation R8 is expected to come with an uptuned version of the VW Group's new 4.0 liter TFSI twin-turbo V8 recently introduced in the Audi S8. For that model, the unit was configured to deliver 520 PS (382 kW / 513 bhp) and 650 Nm of torque (479.42 lb-ft) but Autocar reports that the power plant can deliver greater outputs than that.

Of course, Porsche may opt to use its own engine for the new model.

We await further details in the years to come.