Audi Prologue concept outlines plot for key future models

Usually when we see a new concept car it is significant in that it is a preview of a single important new model. This, the Audi Prologue concept, unveiled at the Los Angeles Auto Show is significant because it previews not only a new range-topper for Audi but also several other key models, including the next A4 and A6.

In its most direct sense the Prologue shows us the look and some of the details of the forthcoming A9 coupe, a new top-of-the-range Audi that will rival the likes of the Mercedes S-Class coupe and the BMW 6 Series gran coupe. Based on the next- generation A8 platform, it is shorter and lower than the current four-door Audi limo and introduces a number of key new items.

Most importantly, it brings width back to Audi design. Ever since the second-generation A6 adopted the upright “shield” grille, Audi design at the front has been all about verticality. While the corners of that signature grille have been pulled out a bit in recent years, the Prologue returns Audi to a classically proportioned full-width grille and a lower nose. It won’t just be for this most expensive model – the next A4 and A6 will look very like this, with the A4 due to arrive in the second half of 2015.

Above the grille, Audi has fitted laser headlights that use five separate elements to control dipped, full and cornering functions, as well as “blank” spots to allow you to keep full beam on without dazzling other road users.

Inside, there is a full-width OLED instrument panel which, by making use of swiping motions, allows driver and passenger to transfer information.

Under the bonnet is, perhaps surprisingly, an extant production engine – Audi's 4.0-litre twin-turbo V8 petrol unit which is already in use in the A8 and RS6. In the Prologue it has had a massive power boost – now up to 605hp with 750Nm of torque.

In spite of those figures and the fact that Audi claims a 0-100km/h time of 3.7 seconds, the engine is surprisingly frugal. It uses cylinder deactivation technology, effectively turning it into a four-cylinder engine on light throttle, and Audi says it can return 32mpg on the combined cycle and emits 199g/km of CO2.

Expect to see it very shortly in the RS6, RS7, next- generation A8 and various Bentleys.