Mercedes-Benz AMG GT VS Mercedes-Benz SL-Class

The only grade missing at the launch of the updated AMG GT was the S Coupe. So, while I'm sure it's darn good, I can really only comment about the driving experience of the R Coupe and the C in Coupe and Roadster forms in which we devoured hundreds of kilometres.

First, the R and C both have unique characters that go beyond just differences in horsepower.

The GT C uses the front axle set-up of the GT S with its aluminium double wishbone suspension, anti-dive, coil springs and stablisier bar offering a more supple and cushioned ride, and combines this with the rear axle of the GT R with its rear-axle steering and more pinned down dynamic focus.

The GT R's front axle is also aluminum double-wishbone but comes with braking torque support, mechanically stepless adjustable coil springs, adaptive dampers and an anti-roll bar.

So, while the GT C and GT R feel different to pilot, it's not night-and-day different... more early summer morning sunrise, and midday sun beating down different, if you know what I mean.

See, while the GT C feels just as quick, it's a far more comfortable and easier car to drive on course-chip bitumen and pock-marked Australian roads. The ride while rolling on 265/35 R19 rubber at the front and 305/30 R 20s at the rear is surprisingly pleasant.

Country road corners beckoned on our journey out of Melbourne and the GT C Roadster I set out in responded superbly. That front end felt light, soft and but pointable. What was immediately apparent was how wide the car is, and it felt like the GT C needed every millimetre of the narrow Aussie lanes.

Top down there was almost zero air turbulence in the cabin and while I kept an eye out for the scuttle shake that can come with a convertible, I barely noticed anything along those lines with those short thick A-Pillars holding firm.

Also holding firm was the GT C's rear end which squatted and held tight in the corners even with getting on the gas the roadster stayed composed.

Roof up, most road noise was shut out, well it was hard to hear anything over the bellow of that V8.

The GT C Coupe would be my pick of the AMG GT family and not just because of that smidge of extra boot space. The hardtop just bolsters the overall rigidity of the car and made it feel tauter.

The GT R is a step up in price, grunt and dynamic ability, but it's asking for a higher level of commitment in terms of livability.

The ride on its firmer suspension and 275/35 R19 rear tyres and 325/30 R 20 front rubber makes the GT R more brutal than most people would be happy to live with, I think.

But in return you are getting close to that "racing car with street legal approval" positioning, because the GT R is astounding in its balance, handling, grip and the connection it offers with the driver.

Truly engaging and almost wasted on a regular road, but why it's not quite a race car is that the cabin is dripping in luxury from the beautiful and supportive standard seats, to the leather upholstery and digital instrument cluster.

I recall driving the AMG SL65 around the backroads of Tassie a few years ago and that twin-turbo V12 monster famously packed 1000Nm of torque, while this car ‘only’ has 800.

But there comes a point where enough is enough… and this is enough!

With maximum torque available from 2500-5000rpm and peak power (430kW) on call from 5500-6500rpm there’s always stupendous acceleration available with a squeeze of your right foot.

Claimed 0-100km/h time is supercar fast at 3.6 seconds, while top speed is a toupe-troubling 315 km/h. And that’s electronically limited!

A typically ferocious engine noise and howling exhaust note accompany rapid progress and shifts from the nine-speed dual-clutch transmission are quick and positive, not to mention especially enjoyable using the steering wheel-mounted paddles.

There are six ‘AMG Dynamic Select’ drive programs from Comfort through to Race, the latter including a Drift Mode, which we didn’t experiment with. Nor did we dip into the ‘AMG Track Pace’ system for circuit-focused mapping and timing

However, far from drifting, the grippy Michelin Pilot Sport 4S rubber (275/35 fr - 305/30 rr) plants the car securely with the all-wheel-drive system and electronic locking rear diff playing their part.

I found the perfect set-up was in the ‘Individual’ mode with the engine, transmission and steering in racier settings and the suspension in ‘Comfort’. The adaptive damping in this configuration mixes smooth ride compliance with sharp dynamic response.

The car’s aluminium space frame chassis is part of a body structure mixing aluminium, magnesium, fibre composites and various strength steels.

Torsional rigidity is claimed to have been improved by 18 per cent and despite the lack of a roof the SL feels tight and solid.

Suspension is by alloy double wishbones front and rear with adaptive damping and active hydraulic anti-roll stabilisation standard (so, no physical anti-roll bars).

At the same time the 4Matic AWD system is able to vary torque distribution up to 100 per cent to the front or rear axle depending on where drive can be put to best use.

The speed sensitive, variable ratio, electronically controlled steering is accurate and turns in beautifully with good road feel. No doubt assisted by electric rear steering able to adjust the angle of the rear tyres by up to 2.5 degrees.

All this adds up to a hugely impressive package that, despite its 1970kg kerb weight, feels agile, athletic and able to attack corners like an overgrown hot hatch, putting its power down with unwavering authority.   

While indecently fast the SL63 can also stop rapidly with the AMG high-performance braking system standard. 

Huge composite ventilated and cross-drilled discs (390mm fr - 360mm rr) are clamped by six-piston fixed alloy calipers at the front and single-piston units at the rear. They wash off speed calmly and consistently with perfect pedal feel.

Even at highway speeds, particularly with the windows up, normal conversation is easy with the roof down. But if you need to raise (or lower) it, the operation takes 15 seconds and is possible up to 60km/h. 

Under the heading of miscellaneous observations, the turning circle is a not insubstantial 12.8m, so beware in the car park.

A front axle lift function is a welcome standard feature, raising the car’s nose 30mm with the press of a button. And lift locations are stored in GPS data, so the car will subsequently remember to lift itself at the same place, even if you don’t! 

Heating and cooling for the front seats combined with the heated steering wheel and Air Scarf neck warming makes winter top-down driving a pleasure.

The digital instrument display is not only crystal clear, it can be changed through multiple configurations, including a tunnel-like graphic for engine revs as well as specific readouts for speed, g-force, the lot.

At the same time, the central media screen’s angle can be adjusted to better cope with reflections and the windscreen wiper system Merc calls ‘Magic Vision Control’ channels fluid along the wiper arms onto the rubbers, which isn’t new, but works spectacularly well here.