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The Top Gear car review:Bugatti Chiron

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The Veyron’s reign as the world fastest production car is at an end, and the usurper comes from within. Yes, the £1.9m Chiron is built to bend physics to breaking point.
 

For: 

Great steering, incredible engineering, astonishing - and brutal - pace

Against: 

It costs £1.9m. And, um, you'll need a long, long road to V-max it.

Overview

What is it?

The Veyron’s reign as the world fastest production car is at an end, and the usurper comes from within. Yes, the £1.9m Chiron retains the Veyron’s fundamental proportions and powertrain, but it’s new in every other conceivable way, and built to bend physics to breaking point.

The Chiron is not a hybrid. Unlike its closest competitors – the McLaren P1, LaFerrari and Porsche 918 - it relies solely on fossil fuels. Its engine is a development of the Veyron’s 8.0-litre quad-turbo W16, its gearbox a strengthened version of the Veyron’s seven-speed twin-clutch, and like the Veyron it deploys its immense power through all four wheels.

“If we went with hybrid we would have added additional weight. We would have experienced package constraints, too, because this car doesn’t have any areas where you can put additional stuff, so the styling would need to change,” Wolfgang Durheimer, Bugatti’s CEO explained. “We will dramatically raise the bar in terms of top speed, we will dramatically increase the power by 25 per cent, the aerodynamics are better, the road holding is better. We didn’t need a hybrid.”

Whereas the Veyron Super Sport produced a piffling 1183bhp and 1106lb ft of torque, the Chiron develops 1479bhp and 1180lb ft. Oh, and at a constant top speed the Veyron could drain its 100-litre fuel tank in 12 minutes, the Chiron can do it in 9.

Clearly this is a game of very senior numbers, so here’s some more. It will accelerate from 0-62mph in less than 2.5 seconds, 0-124mph in less than 6.5 and 0-186mph in under 13.6. Take a moment to let that last one sink in. That’s 2.9 seconds faster than a P1 and a second quicker than the Veyron Super Sport, bearing in mind that at 186mph a second equals a lot of fresh air - 83m of it to be precise.

Then there’s the top speed, which Bugatti has limited to 261mph - a token 3mph more than the Veyron Super Sport. The specially-developed, wider Michelins can take more, Bugatti says, and will be used for a Chiron’s record-setting attempt, which is expected to surpass 270mph, but the limiter is a “safety measure for road-travel”. Euro NCAP will be delighted.

Key to the engine’s swollen power reserves are four larger turbos that work in tandem to deliver maximum torque from 2000 to 6000rpm – that’s across 70 per cent of the engine’s full operating range.  The two-stage system only calls on two turbos up to 3800rpm, to improve throttle response, and all four beyond that. A new titanium exhaust system helps out by reducing back pressure compared to the Veyron and houses two enormous catalytic converters – each six times the size of one you’ll find in a Mondeo. There are six exit pipes in total – four sticking out the back and two pointing downwards to create a blown diffuser – a downforce-boosting technology proven by, then subsequently banned in F1.

Everything about the Chiron’s powertrain is super-sized. An improved charge air cooling system means 60,000 litres of air per minute are pumped through the engine, while the coolant pump can circulate 800-litres in the same time. According to Willi Netuschil, head of engineering “temperature management is one of the biggest problems”. In total there are 10 radiators crammed under the Chiron’s skin.

With great power comes great need for big brakes, so the front and rear discs are now 20mm larger, 2mm thicker and made from carbon silicon carbide – a material that’s both lighter and more resistant to fade. Clamping them are eight-piston calipers in the front and six-piston at the rear – each piston a subtly different diameter to keep brake wear even.

The tyres, now 14 per cent wider at the front and 12 per cent wider at the rear, are wrapped around larger rims – 20-inch front and 21-inch rear – and built to withstand otherworldly forces. They need to be, as each gram of rubber is exposed to a centrifugal force of 3,800G. A bigger contact patch on the road means better braking, acceleration and wet-weather grip, while the updated four-wheel drive system uses electronic diffs on the front and rear axles, allowing fine control of the handling characteristics. More on that in a bit…

As a starting point for the world’s fastest car Bugatti uses a new carbon-fibre monocoque (each one takes four weeks to make), with a carbon-fibre rear-subframe attached to save 8kg versus the Veyron and boost rigidity, while the entire package is wrapped in a carbon-fibre skin. Bugatti claims torsional stiffness is now up there with an LMP1 prototype, while a new electric steering system and suspension bolted directly to the monocoque means it should react to inputs faster than a 1995kg car has any right to.

Continue: Driving

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