Audi A1 e-tron: First Drive Of Range-Extended Electric Car Prototype

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The Audi A1 e-tron was almost a sideshow to our day at the company's future lab tron-experience at Berlin's spectacular and disused Tempelhof Airport.

Drives squeezed in over lunch or at the end of the day reflect the A1 e-tron's unfortunate status: Stillborn prototype, rather than fully-fledged production model.

And after driving it around Berlin's crowded streets, we think that's a shame.

Unique drivetrain

The Audi A1 is a subcompact car sold in Europe, based on a similar platform to that of the equally Europe-only Volkswagen Polo.

It's sold in both three-door and five-door 'Sportback' hatchback variants, and usually comes with a range of four-cylinder gasoline and diesel engines.

The e-tron is rather different.

Audi has binned the reciprocating combustion engines in favor of an 85 kW (114 horsepower), 221 pounds-feet electric motor. Internal combustion hasn't disappeared completely though--under the trunk floor is a small Wankel rotary engine acting as a range-extending generator.

The theory is that the Wankel's compact size makes it ideal for a small car like the A1; its small capacity and constant engine speed reduces the fuel consumption rotary units are usually known for; and as a rotary it's far, far smoother--and therefore less intrusive--than a regular piston engine.

We did try and take a peek at the rotary unit beneath the trunk floor, but a chunky (and firmly screwed-down) metal cover thwarted our efforts.

Audi A1 e-tron first drive, Berlin

Audi A1 e-tron first drive, Berlin

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Driving it

We were able to test that smoothness for the briefest of moments as we switched on the e-tron, the faintest of hums emanating from the rear of the car for ten seconds or so.

The car's conventional-looking shifter allows you to utilize rotary power from the start if needs be, for those hypothetical zero-emissions cities that may require you to hold the battery's 31-mile charge for entering city limits.

With the lever in 'D', it's just like any other electric car: Near-silent.

The instant torque and compact body makes it a breeze to drive in traffic too. Allied with quick steering, it encourages you to dart for gaps you'd think twice about in a combustion equivalent.

0-62 mph acceleration is quoted as 10.2 seconds, but as with most electric vehicles, it feels a little quicker on the road--mainly as its lower-speed acceleration is unhindered by gearchages.

Paddles behind the steering wheel let you pick your level of braking generation in four levels, from none at all to quite strong regeneration. It's in the strongest setting the A1 e-tron's unfinished prototype status is betrayed. The transition from acceleration to deceleration happens with a jerk, and not for the want smoother driving--even the most delicate of motions on the accelerator pedal results in learner-like lurching as the regen kicks in.

This is reduced in the lesser settings, but even then, smooth driving wasn't easy. And stepping away from the mark is a little sudden too.

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