Here’s the key that helped Bugatti do 407kph

By topgear, 28 April 2020

It’s almost 15 years to the day (we’re nine days late, sorry) that the Bugatti Veyron did 407kph, or 253mph, at Ehra-Lessien in Germany, making it the fastest production car in the world.

Of course it can only do a paltry 236mph (380kph) usually. Anyone with enough space to reach (and stop from) 253mph (407kph) has to insert a special ‘Speed Key’ in a slot beside the driver’s seat to unlock the Veyron’s full potential.

And even then the car might not let you – turn the Speed Key and the Veyron’s computers run through a load of checks, only granting access to ‘Top Speed’ mode if specific conditions are met. Tyre pressures even slightly out? No speed for you.

In Top Speed mode ride-height is reduced from 125mm to just 65mm at the front and 70mm at the back, the rear-wing is lowered and angled at two degrees and the diffuser flaps are closed to minimise drag among others.

On April 19 2005, only a few months before production was set to begin, test driver Uwe Novacki hit 411kph in the Veyron at Ehra-Lessien. A display at the track suggested he’d managed 427kph – 265mph – but it was later proved inaccurate.

So after a load more runs in both directions, the speed Germany’s TÜV Süd entered into the record books was 407km/h. History was made, Mr Piech was happy, job done. For a while, anyway…