The Porsche 918 Spyder will finally be revealed in production specification at the Frankfurt motor show, it has been confirmed.

The final production-spec car, so far revealed only in a tweet from Porsche, had its dynamic debut at the Goodwood Festival of Speed earlier in the summer - but even then was still described as being in late pre-production form. The £628,000 hypercar, which is set to rival the likes of McLaren's P1 and the LaFerrari, will go on sale next month.

Porsche says the 918 Spyder is a pioneering model, in the mould of the Porsche 911 when it launched 50 years ago. Bosses claim "unprecidented" performance, with a 4.0-litre V8 and electric motors combining to produce 887bhp and a 0-62mph time of 2.8sec. It is said to to return between 94mpg and 85mpg on the combined cycle and emit 70g/km of CO2.

The car will later be offered with a Weissach performance package, which is expected to include extra use of ceramic, titanium and magnesium parts.

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