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World’s fastest piece of mobile scaffolding gets a new chassis and turbocharged engine

The Ariel Atom 4 is not strictly the fourth iteration of this British-built lightweight special.

The first Atom arrived just in time for the millennium with 190bhp from a naturally aspirated 1.8-litre Rover engine. Launched in 2003, the Atom 2 that followed had as much as 300bhp courtesy of a new supercharged Honda engine, and that was a recipe Ariel stuck with for the Atom 3 of 2007.

Ariel makes no attempt to hide its association with Honda, which has long provided the Atom’s engine. This is the first time the car has used turbocharging, which has increased accessible torque by as much as 75%.

But the next chapter in the Atom story dispensed with the pleasantries, at least outwardly: the winged Atom V8 of 2010 packed 500bhp from a 3.0-litre unit that started life as two Suzuki motorcycle engines. It was a mad, 25-off machine we described as being “brilliant to its core” despite the £150,000 asking price and it demonstrated that the 20 or so employees at Crewkerne could build a genuine world-beater.

Ariel returned to relative normality with the introduction of the Ariel Atom 3.5, which in 2013 reprised the 2.0-litre Honda unit in the Atom 3, only this time with up to 315bhp to go with the slimline new headlights and an even stiffer chassis. Naturally, it was subtly but noticeably better to drive than the Atom 3 and Ariel’s waiting list duly grew.

Which brings us back to this week’s road-test subject – in truth, the sixth Atom – for which only the pedals and fuel-filler cap are carried over from the Atom 3.5. By now, we’re expecting brilliance, but it’s the precise nature of that brilliance that should fascinate.

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The Atom 4 line-up at a glance

There isn’t really any such thing as an Atom model range. Back in 2004, Ariel introduced the cheaper Atom 160, a ‘feeder’ version of the Atom 2, with engine power pegged at 160bhp – but it didn’t last long. Subsequently, the firm created a top-of-the-line model by proxy, by offering the supercharged engine as a factory option.

As Autocar understands it, however – and with customers on a three-year waiting list – there are no plans to introduce a cheaper version of the Atom 4. That doesn’t mean we won’t see extra-special, limited-edition versions of this generation car, though, but to expect another madcap Atom V8 would be wishful thinking.

Price £39,975 Power 316bhp Torque 310lb ft 0-60mph 3.2sec 30-70mph in fourth 4.2sec Fuel economy 27.4mpg CO2 emissions na 70-0mph 44.1m

What Car? New car buyer marketplace

DESIGN & STYLING

Ariel Atom 4 2019 road test review - hero side

When you buy an Ariel Atom, you’re buying a machine hand-assembled by a single technician. This process hasn’t changed much from the days of the first-generation car. However, as you’ll now discover, the design and hardware for the new Atom 4 is markedly different from that of even the Ariel Atom 3.5.

The core principles remain: the exposed exoskeleton acts as a basis for aluminium double-wishbone suspension controlled through adjustable pushrod coilover spring-and-damper units. Bilstein dampers are standard, though our car uses optional adjustable suspension struts from Ohlins with remote damping reservoirs that are specially made for Ariel. The car’s unassisted steering survives, likewise its mid-mounted transverse engine that drives the rear axle through a six-speed manual gearbox, and an optional mechanical limited-slip differential if you want one. Our test car had the latter, as well as an optional AP Racing brake upgrade kit, adjustable traction control electronics and a turbo boost controller with which to limit (or unleash) the propulsive potential of the new forced-induction powertrain, more on which in a moment.

Attractive pushrod-actuated spring-and-damper units can be seen through the Atom’s steel exoskeleton. Our car uses optional Ohlins hardware, which, with yellow springs and gold casings, is particularly eye-catching

Though made from steel, the tubular chassis builds on what Ariel learned with its experimental titanium chassis of 2014. The bronze-welded tubes are therefore wider in diameter than before, which helps make the car 15% stiffer than its predecessor. There’s also now greater leg room and better protective properties in the event of front impact, though the car’s dynamic behaviour is also said to have benefited from new suspension geometries (and these are not simply tweaks – there are fresh pick-up points, plus anti-squat and anti-dive measures), and a staggered wheel set-up now an inch larger at each corner. Stability should also have improved thanks to a fractionally longer wheelbase.

The car’s new turbocharged engine comes from the current Honda Civic Type R, meaning you get the rather marvellous K20C oversquare 2.0-litre four-cylinder i-VTEC engine with 316bhp and 310lb ft, so long as you’ve got the boost control in its highest mode. Ariel estimates kerb weight at 595kg in running order, depending on specification: roughly 20kg heavier than the Atom 3.5, but still ranking the car among the very lightest on the road. Our test car weighed in at 680kg with a full tank and in running order, with plenty of options equipped.

At only 162mph, the Atom 4’s top speed highlights the designers’ considerable battle with drag, though improvements have been made. All the car’s panels – most of which are available in carbonfibre – are new and the old roll hoop is now neatly enclosed with the air-intake bodywork. Never before has the Atom sat so low and wide on the road.

INTERIOR

Ariel Atom 4 2019 road test review - seats

Because it so obviously exposes its driver to their immediate surroundings, it doesn’t seem accurate to describe the Atom as being in possession of a traditional car interior.

Cockpit seems like a more apt choice of word; and as far as cockpits go, even in the world of track-bred thrill machines, the Atom’s is still a wonderfully sparsely finished one. Stripped out and with no room for anything but the functional, there is almost nothing here to distract you from the task of driving – particularly if you’re prepared to excuse Ariel’s decision to offer a fitted motorbike satellite navigation system in the car as an option, which our test car had.

Seats provide plenty of lateral support for fast track use, but their plastic construction means they’re slightly reminiscent of unforgiving classroom furniture.

A pair of individual plastic buckets seats replace the one-piece, two-seater moulding of the old car (a change most welcome because it makes adjusting the position of the driver’s seat that much easier), and elsewhere there’s a gearlever, three pedals, and a smattering of buttons and switches housed behind a relatively small-diameter, suede-upholstered steering wheel.

The closest our Atom came to having a bona fide infotainment suite was the GPS lap-time recorder integrated into the digital instrument display. It consists of a receiver mounted just ahead of the cockpit, which can automatically detect when you’re on a circuit (at least in the UK) and uses satellite tracking to record and display your lap times on the screen in front of you.

A more surprising optional extra was the reversing camera (£395). This sees through a lens housed just beneath the rear foglight, with the video feed being automatically transmitted to the digital instrument screen as soon as reverse is selected. Given how limited over-shoulder visibility is with a helmet on, it’s very welcome. Ariel had also seen fit to equip the Atom with an aftermarket TomTom portable navigation unit, which was mounted to a charging dock that had been wired into the car’s power supply. This was a £480 option and worked well enough.

The low, thin sheet of clear Perspex that runs the width of the scuttle, with upright protrusions ahead of each seat, is more wind deflector than windscreen. It’s optional-fit (£191), curiously, but also the sort of extra you’d only leave off your Atom order form by mistake, or out of ignorance of just how important a contribution to on-board wind protection and all-round touring comfort it makes.

Clambering over the Atom’s intricate exoskeleton spaceframe in as graceful a manner as the elasticity of your trousers allows, and then lowering yourself down into the driver’s seat, certainly brings with it plenty of sense of occasion. Once you’re in, the view immediately forwards and sideways is almost entirely unimpeded, although that sense of remarkable visibility takes a bit of a hit when you realise that driving the Atom is something you’d only ever do with a helmet on.

Otherwise, the car’s general ergonomic layout is excellent. Storage space becomes a rather moot point when you realise that there is little more you’d carry in an Atom that you couldn’t fit in a rucksack or in the storage box of a superbike; and in that respect, cars like the Caterham Seven do have a practicality advantage over it. Still, there is a small compartment under the nose cover that’s big enough for a drink and an energy bar or two. Which is handy, because as you’re about to find out, you’ll probably be in need of them.

ENGINES & PERFORMANCE

Ariel Atom 4 2019 road test review - engine

At its peak in the back of the Ariel Atom 3.5R, Ariel’s old K20Z four-cylinder supercharged Honda engine produced 243lb ft of torque just above 6000rpm; the new K20 turbo makes 310lb ft at half that crank speed – in a car weighing so little as to make such a gain in accessible torque feel very significant indeed.

The upshot is that the world’s fastest piece of mobile scaffolding no longer needs to be driven with much gusto to feel like a performance heavyweight. Leave it in fourth gear and the Atom 4 will go from 30-70mph in just 4.2sec; as quickly, but for a solitary 10th of a second, as a 715bhp Aston Martin DBS Superleggera will. Taking on long dual-carriageway-born distances, the Atom can overtake with real urgency from both low revs and high.

A lap time squarely in modern supercar territory, and only half a second slower than the Atom V8 managed in 2011 (1min 8.4sec), is a seriously impressive showing.

And, predictably enough, it gets off the line rather smartly as well. The Atom now comes with optional-fit electronic launch control, although its use is equally optional; if you prefer, just dial the traction control down to zero, select second gear, wind engine revs up to the static limiter automatically imposed at 5000rpm, and then choose how much wheelspin you want by the vigorousness of your clutch action. Even when bypassing first gear altogether, you can still get wheelspin as the turbos really spool; but get the juggling act perfected and this £40k car will hit 60mph from rest as quickly as a £200k exotic.

Our fastest one-way run was 3.1sec; the car might even be a sub-3.0sec prospect on a perfect surface and without a passenger on board. The turbocharged engine needs a second or so to inhale before it delivers big torque at middling revs, but it retains the surprisingly delicate fine throttle control and distinguishing appetite for revs that Honda’s latest four-pot turbo evidences in other applications. It sounds good at high revs, too, when there’s plenty of combustion noise and not too much of its inductive counterpart.

It doesn’t have the perfect linearity of delivery, that hairline responsiveness or the banshee wail of the engine it replaces, however. There are times when you miss the high-rpm theatricality and reward of the Atom’s old supercharged motor, it’s true. But you can’t deny that Ariel has to move with the times and simply adopt the best of what’s available for this car to allow a future for it.

The Atom 4’s turbo four is, in all probability, the finest engine of its kind that a company like Ariel could have appropriated for it – and, turbocharged or not, remains a very worthy fit.

RIDE & HANDLING

Ariel Atom 4 2019 road test review - chicane front

You need to keep both hands on the small, perfectly placed, Alcantara suede steering wheel of the Atom 4 to guide it confidently, even at everyday speeds. The rim is quite heavy – but it feeds back information from the front contact patches in a wonderfully lucid and meaningful way that’s the perfect introduction to the deliciously involving, analogue driving experience you’re diving into, fingertips first.

The car’s steering ratio doesn’t feel particularly direct, rather very intuitively paced, and is well-suited to a small, light, naturally agile car. It also communicates load brilliantly as you add lock, giving you supreme confidence as the front sidewalls begin to flex; and letting you know, as that load ebbs and flows, whether the grip level underneath you is rising or falling. Come good weather and bad, then, you’ll always know where you are with this car.

For me, the Atom’s so brilliant to drive because of its flaws, not in spite of them. It rolls and pitches that little bit more than the average wing-tastic, mid-engined track missile – but also communicates so much better, and has masses more dynamic charm

Ariel has evidently calmed the propensity of the Atom’s steering to kick back over bumps and to tramline slightly, and so only at low speeds and over particularly sharp edges do you feel the need to tighten your grip on the wheel. And yet, whatever speed you’re travelling at, the sense of intimacy with the Atom’s lightly loaded front wheels remains truly striking. On track, as the tyre temperature builds, it’s almost as if you can feel the carcasses warming in the palms of your hands.

For our track testing, the adjustable Ohlins suspension of our test car was set fairly permissively for compression and rebound damping – by Ariel itself, we should add – but a little experimentation proved that, even if you crank up the dials, this remains a dynamically characterful car with a centre of gravity that’s quite high by lightweight track car standards. It likes to move around on its suspension springs a little bit, and to master it you need to learn to manipulate its mass not unlike you might that of a sports bike or even an old Porsche 911.

That’s a process you can begin on the road, as you develop a sense of the Atom’s rearward weight bias and its surprisingly rangy gait over bumps; but it becomes really absorbing and wonderfully vivid on track, and one to savour for every delicious moment.

COMFORT AND ISOLATION

Even with those adjustable Ohlins dampers set to a more track-biased configuration, the Atom’s primary ride exudes a level of compliance that, at first, seems at odds with its hardcore ethos. It takes undulating surfaces in its stride with sophisticated suppleness, and successfully rounds off the edges from sharper, more sudden compressions without any great compromise to its otherwise excellent vertical body control.

Comfy-riding or otherwise, though, you wouldn’t call the Atom relaxing to drive even when touring and, because of its size and all-round vivaciousness, you remain very aware of any imperfection in the road surface that’s passing beneath the Atom’s open wheels, and ready to react to each. Thankfully, only at low speeds and over the worst lumps and bumps will you find that you really need to; generally, the car tracks straight and doesn’t seem particularly highly strung by the standards of its peers.

Now much more physically draining than the car’s dynamic temperament is how exposed to the elements it leaves you. There’s no heater: your own warmth will depend solely on the weather and how well dressed you may or may not be for it. Some physical effort is required at motorway speed to keep your head steady in the wind, which quickens the onset of fatigue.

Then there’s the noise. At idle, our microphone returned a reading of 74dB, and shot to 92dB at a 70mph cruise – which is definitely earplugs-within-a-helmet sort of refinement.

The seats are comfortable at first, if a bit unforgiving over distance. Most of our testers agreed they did a good job of holding you in place, though the lack of lower back support proved a minor issue for some. In short, you probably wouldn’t want to spend more than an hour in an Atom without a break – and most owners won’t plan to. Imagine using it like a superbike and you won’t go far wrong.

MPG & RUNNING COSTS

Ariel Atom 4 2019 road test review - hero front

It seems incredible that something with supercar levels of performance and utterly peerless driver engagement can be had for as little as £39,950, and yet that’s the starting price for this latest-generation Ariel Atom.

For that money, the car does without the Ohlins dampers (£4987), the AP Racing brake kit (£2388), adjustable traction control (£1950) and the myriad other optional extras that pushed our test car’s price up to £54,307. But even for that money, this car seems like stellar value for all sorts of reasons.

Ariel doesn’t offer a PCP finance scheme, but does offer brokered access to a hire purchase deal that, after a 10% deposit, will allow you to drive an Atom 4 from £626 a month, with a £16k balloon payment after four years.

It pays to remember the fact that Ariels are as good as immune from depreciation, too; examples of the Atom 3 and 3.5 are listed on classified sites with asking prices in excess of £40,000 at five years old, which bodes very well for the ownership credentials of this latest version too.

VERDICT

Ariel Atom 4 2019 road test review - static

Having played the renegade on the ultra-lightweight sports car scene for so long, the Ariel Atom has now become a key part of the establishment it once sought to disrupt. Such progression doesn’t happen by chance; and this car is so typical of how cleverly its maker has developed it over the years to retain what makes it so special.

In a visual sense, the Atom remains an appealing car to anyone who likes the idea of being able to see their car working. It’s also so deliciously simple that it makes modern ideas of perceived quality and more meaningful built-in quality one and the same consideration.

Track slayer is unrivalled for built-in quality and dynamic character

A turbocharged engine has boosted the car’s usability as well as its roll-on performance with little entailed compromise, while Ariel’s other chassis and suspension tweaks have proven well worth making. The Atom retains so absorbing a dynamic character that it can be enormous fun on both road and track, when so many of its close rivals simply can’t do both.

If you want one, the waiting list is a staggering three years long; but we’d bet that it’ll still be the outstanding car of its kind in three years time, just as it so plainly is today.

What Car? New car buyer marketplace

Ariel Atom 4 First drives