Mercedes-Benz AMG GT vs Porsche 718

What's the difference?

This is no Lotus, but damn if it ain't a hell of a good time, and proof positive that electrification can enhance the V8 experience, rather than ruin it.

The 718 Cayman Style Edition only costs a bit more than the entry-grade Cayman it's based on, but opens up more special colours and contrasting features from the wheels to decals, even leather upholstery. The value is good, the look is enhanced and the car remains superb to drive on the right roads.

Living with a Cayman daily is ‘do-able’ but you’ll have to be understanding given it's not the most user-friendly car to drive, and then there’s the low-level safety tech.

But in return, you’ll own one of the best and relatively affordable prestige sports cars ever made and one of the last of the combustion-powered Porsche Caymans.

It's a mean, but somehow still sleek, looking beast, this big AMG, but it's also immediately recognisable as a thing of intent.

Up front, there's the huge vertical-slat grille that looks like it drove straight out of a Stephen King novel, a massively domed bonnet, and these vacuum-like side intakes that look like they could suck in stray animals.

Then, at the back, there are twin dual-pipe exits (for four in total), and an automatic wing that pops out of the rear bodywork. And all of that's capped off with these massive 21-inch forged alloy wheels hiding golden ceramic-composite brakes.

Mean, yes, but not quite as aggressive as you might expect the most powerful AMG to date to come across, perhaps.

Inside, it's more subdued again, with the AMG presenting a pretty passenger-friendly space, with all the Benz tech you'd imagine, including the massive screens, and — thanks to its air suspension and drive modes — the ability to tailor the ride to your liking, meaning a comfortable and premium experience, despite the power under your right foot.

The 718 Cayman is often labelled as the 'junior 911' but that downplays its status as an outstanding sports car in its own right.

It’s not a smaller version of the 911, at all, but it is smaller than a 911. Not by much, though. The Cayman is 140mm shorter in length than the 911 at 4379mm end-to-end. Interestingly, the Cayman has a longer wheelbase at 2475mm and is taller at 1295mm.

The 718 Cayman is beginning to date in its design with this generation of the sports car arriving eight years ago. From the outside it’s holding up well in terms of styling , but inside it feels very 2016 with the small media screen and analogue dials.

It gives me a weird nostalgic feeling I normally only get driving older cars, but in a current model. Which could be why Porsche is jazzing the Cayman up with this Style Edition.

The Style Edition enhances the look of the entry-grade Cayman with 20-inch 718 'Spyder' wheels in a high gloss black or white finish, and there’s a choice of six special colours ranging from the Crayon hue our car wore to 'Ruby Star Neo', 'Shark Blue', 'Carmine Red' and 'Arctic Grey'.

The Style Edition also adds black sport tailpipes, full-colour Porsche crests on the wheel hub covers, a black leather interior with contrasting Crayon stitching, Porsche crest embossed headrests, illuminated door sills and floor mats with Crayon contrast stitching.  

Buyers can also choose a 'Contrast Package' in black or white which adds Porsche lettering to the side of the car and a strip to the bonnet.

It's not overly practical, given its size, with AMG locking in a four-seat configuration with a fixed rear pew that limits boot space. You can get folding seats, but only as part of an option package.

What you're left with is a vehicle that stretches 5054mm in length, 1953mm in width and 1447mm in height, but that serves up rear seating for only two – albeit very comfortably – and, because of the electric battery and motor being housed at the rear, boot space of just 335 litres.

There is triple-zone climate control, and the rear seating is lounge-like and luxurious, while the up-front space is ample for two full-size riders, too.

There's no spare, with AMG's 'Tirefit' puncture repair system on board.

The 718 Cayman doesn’t have back seats -  it's a two-seater sports car. Cabin storage is almost non-existent but is saved by a glove box and pull-out door pockets which are bigger than they look.

Surprisingly, there are three cupholders - two which pop out of the dashboard above the glove box and another in the small centre console bin.

Cargo space isn’t bad for a two-seater sports car with 184-litre rear boot and a front boot with a 150-litre capacity. That’s roughly one nine-year old child as you can see from the photos. My son wanted to sit in there, which I agreed to, but I said no when he asked me to shut the bonnet.

The 718 Cayman Style Edition lists for $136,700 and this is for the manual version, the auto is $5340 more. All up Porsche is asking $4200 more than the entry-grade Cayman it’s based on. In return you’re getting some nice features you won't find on the standard model. 

There's the chunky black exhaust tips, the full-coloured crests on the wheel caps and inside is the black leather interior package with embossed headrests, illuminated door sills, and floor mats with 'Crayon'-coloured stitching.

Buyers can also specify one of two Style Edition contrast packages - one in Black and one in White -  at no extra cost. Ours had the Black package specified and added the Porsche decals to the side of the car, the stripe on the bonnet and the gloss black 20-inch wheels.

The colour of our car was Crayon which comes as part of the bespoke colour offerings with the Style Edition.

Along with these Style Edition features there are the standard features of the entry-grade Cayman, including LED headlights, proximity unlocking, power adjustable sports seats, media display with sat nav, Apple CarPlay and dual-zone climate control.

If you’ve been driving new cars lately you might be a bit disappointed by the Cayman’s small media display (it’s a 7.0-inch screen which is tiny by today’s standards) there’s also no Android Auto available (just Apple CarPlay) and safety tech is relatively light-on, too. You can read about this further down.    

It should be pointed out here that our car was fitted with a dual-clutch automatic transmission and the optional adaptive cruise control ($2320).

It's not just what's under the bonnet, but what's at the rear axle, too.

But let's start at the front, shall we? Here, a familiar twin-turbo V8 engine lurks, producing a potent 470kW and 900Nm, which is fed through a nine-speed automatic, complete with paddle shifters and several drive modes, including the traction-limiting 'Race'.

But that is then joined at the rear by an electric motor with its own two-speed transmission, and which produces 70kW and 320Nm – or up to 150kW for 10-second blasts under heavy acceleration.

Combine both, and you're tapping into around 620kW and in excess of 1000Nm, enabling a sprint to 100km/h in just 2.9 seconds, and a flying top speed of 316km/h.

So, under the bonnet of a Cayman is the front boot, but if it’s the engine you’re after you’ll need to go through the rear hatch because this is a mid-engined car.

Getting to the engine means removing several fixtures and covers which begins to feel like you’re dissembling the vehicle and comes with a rising anxiety that it all won’t go back together.

But it all clicks back in. It’s just a slow and tedious process. Fortunately, oil and water can be added by removing the circular covers you can see in the images. 

Under the layers of covers, deep down just in front of the rear axle, is the Cayman’s 2.0-litre ‘flat’ four-cylinder turbo-petrol engine which makes 220kW and 380Nm. A seven-speed dual-clutch automatic transmission sends drive to the rear wheels. 

It’s not a huge amount of power but the Cayman only weighs 1365kg and so can get from 0-100km/h in 5.1 seconds. Not brutally quick but the way this car handles is what you’ll like.  

Oh, and just to be clear, the Style Edition doesn’t bring any extra power or engine changes. The outputs and performance are the same as the entry-grade Cayman.

Fuel efficiency is surprisingly impressive for a vehicle this big and powerful, with Mercedes claiming 7.7L/100km and 175g/km of CO2 on the combined cycle.

Helping that is a the 6.1kW battery, which delivers just 12km in all-electric driving range, but helps reduce overall fuel use.

This AMG is AC power only, meaning you can't recharge using fast chargers, but the brand says its secret trick is its ability to recharge itself using captured kinetic energy incredibly quickly – largely negating the need to plug in unless you want to unlock that EV range – with Merc suggesting that, on a race track for example, the battery will discharge and charge itself continuously as you're lapping.

Porsche says that after a combination of open and urban roads the Cayman’s fuel consumption should be 7.0L/100km. My 143km fuel test, taking in country roads and school runs, used 21.8L of petrol and equates to 15.2L/100km. Which means I had about twice as much fun as Porsche did when it recorded its fuel consumption.

The 64-litre tanks means in theory you should be able to travel 914km between fills if you’re conservative with fuel.

There's a lot of big numbers surrounding the Mercedes-AMG GT63S E Performance, but let me throw another one at you – 245km/h.

That was the high score I saw pop up on its digital speedo as the big and electrified Mercedes flew down the main straight at Sydney Motorsport Park (formerly Eastern Creek), before my courage ran out and my foot found the brake.

That kind of velocity is mind-bending in a vehicle this big, and so is the way that power is delivered, with the AMG's big brain deciding how and when to maximise power from the engine and electric motor to deliver a constant surge of torque that shoves you back, and the GT63S E Performance into the future.

But big acceleration is hardly surprising with that much power. What is a little more impressive is how easy this four-door supercar is to wrestle around a racetrack.

Sure, the feeling-out process is a little more involved, as you figure out how and when you'll feel the weight shifting, and as your brain struggles to compute how what's happening is even possible, but after a couple of laps the AMG settles into an easy, flowing rhythm that, while never feeling light on its feet, also doesn't feels like you're piloting a bus.

At least part of that is down to the wizardry on board, like the 'AMG Air Suspension', the rear-axle steering and the limited-slip diff, all of which combine to make the GT63S feel tighter and sharper than it would otherwise.

But it's also partly down to the prodigious power on offer – perfect corner entry and exits are less relevant when you have a cruise missile strapped to your right foot that doesn't just quickly make up for any driver errors, but shrinks the space between corners to the blink of an eye.

Yes, it's heavy, and there isn't much that's pure about the go-fast experience, but it left an ear-to-ear grin on my face, and isn't that priority one for any new AMG?

How does it drive on the road? That I don't know, as this was a track-only drive day. But we will get one on a proper test soon and let you know.

The 718 Cayman Style Edition doesn’t come with any performance advantages over the already brilliant entry-grade Cayman it’s based on. And it is brilliant to drive. Several big steps above Audi’s TT, Nissan's Z or Toyota and BMW’s Supra/Z4 'twins under the skin' in terms of handling, steering and engagement. 

That said, the Cayman isn’t as easy to drive as any of those cars. The steering is heavy, the accelerator is stiff, the dual-clutch auto transmission feels a bit rough and the turbo lags, then sends in the mumbo a bit too fast and too late. Oh, and and the seats are a tad tight.

But I can overlook all of this because on good winding country roads the Cayman feels like a water drop running down a wall, moving naturally and harmoniously around whatever it encounters.

The day-to-day school runs and grocery getting isn’t quite as poetic, and a Cayman proves challenging in the real world over potholes and in supermarket car parks. You’d have to love the Cayman for better or worse, as many do, to live with it daily. If you can't, there's the Audi TT.

The almost complete lack of standard advanced safety technology on board the Porsche Cayman might be a deal-breaker for you. There’s no AEB (forward or reverse), no cross-traffic alert and no lane keeping assistance. But there is blind-spot warning, front and rear parking sensors and a reversing camera. Adaptive cruise control is a $2320 option.

The 718 Cayman hasn’t been crash tested and therefore doesn’t have an ANCAP rating, but you’ll be pleased to know there are four airbags covering the driver and passenger.

The GT63S E Performance is covered by Mercedes' five-year, unlimited-kilometre warranty, and you can pre-pay your service costs to keep the prices down.

Service pricing for the electrified model is yet to be confirmed.

The Cayman Style Edition is covered by a three-year/unlimited kilometre warranty and servicing is needed every 12 months or 20,000km.

With Porsche, final service costs are determined at the dealer level (in line with variable labour rates by state/territory).

We'd like to see the warranty coverage increased to five years/unlimited kilometres which will bring it in line with more mainstream brands.