The death of the manual gearbox

What happens, for example, if you take your driving test in a car with a dual-clutch gearbox and then buy a secondhand car that’s manual? Would you be allowed to drive a manual car, having passed your test in a dual-clutch auto BSM Corsa? 

And why is it that the dual-clutch auto in particular – expensive to engineer and traditionally heavier than its manual equivalent – has become the transmission of choice of late, especially among cars aimed squarely at the enthusiast?

So here we ask several key engineers from some of the more high-profile sports car companies why, and indeed if, they believe that the manual gearbox became a thing of the past in 2013.

Aston Martin

Director of product development at Aston Martin Ian Minards explains why the new V12 Vantage S – one of the rawest, manliest sports cars that money could buy at one time – swapped from manual to paddle shift this year.

“The V12 Vantage S uses the new iteration of our automated manual transmission, Sportshift III, for very good reason,” he says. “Aside from the considerable weight saving – it’s 20kg lighter than an equivalent manual – this gearbox not only broadens the appeal of Vantage S in markets where there is little or no appetite for a manual, but it also delivers the kind of motorsport-derived performance that is simply unachievable with a conventional stick shift.

"That said, I’d never say ‘never’ when it comes to the retention of a manual transmission in an Aston Martin. We currently feature a manual gearbox in the V8 Vantage, of course, and I think it’s a little early to pronounce the manual gearbox dead – in our line-up, at least.”

Mercedes-AMG

Fair enough, but what about AMG? There hasn’t ever been a manual gearbox offered in one of these, but this year the first AMG hot hatch went on sale in the form of the A45, but without the option of a manual transmission. Why not?

Head of AMG Tobias Moers explains: “I’m a bit of a traditionalist at heart and can understand why people wish the involvement of a manual gearbox, but the automatic gearboxes give us so many more options technically. They can cope with the increasing power and torque demands we put on them and, on the rational side, they’re more efficient than manuals. The paddles are also more practical when you’re really pushing and the system is more relaxing to use when you aren’t. There are just fewer compromises.”

So how about Renault’s explanation as to why there is no longer a version of the Renaultsport Clio – perhaps the most engaging hot hatchback there ever was – with a manual gearbox?

“Because the trend in customer demand is moving more and more towards dual-clutch transmission, and this trend mirrors that seen in the high-end sports car market,” says Christophe Besseau, project director for Renault Sport Technologies. “More than 50 per cent of rival performance cars are available in dual-clutch form. EDC gearboxes are more efficient than manual gearboxes, especially in terms of gearchange speed and economy.

"The EDC ’box that we have developed includes the option of fully manual changes. In Race mode, the gearbox is totally manual, operated by either the paddles or the gearlever. Shifting gears at less than 150 milliseconds, it will not change up at the red line, nor will it kick down, yet it is much more efficient than a manual.”

Porsche

Probably the most controversial ditching of the manual gearbox this year occurred at Porsche, whose new 911 GT3 (and Turbo) went exclusively PDK (the firm’s own dual-clutch automatic), having been one of the last bastions of old-school driver appeal in its three previous iterations. Porsche’s head of GT car development, Andreas Preuninger, acknowledges that it was a contentious move, but a necessary one. He says: “The outcries of many fans still resound: ‘A GT3 without a manual gearbox is not a GT3 any more.’ And I can only repeat: ‘Yes, it is.’

“The ‘simply add lightness’ philosophy to make a car faster, especially the past three GT3 generations, just does not apply any more. Nowadays, systems that add extra speed over-compensate their extra weight very clearly. Purism and performance are no longer inextricably linked. Indeed, they turn more and more into opposites today. 

“At Porsche, we all love to shift gears manually, but what we love even more is being the fastest. Therefore, PDK is a must. The system may weigh 20kg more than the seven-speed manual transmission of the current 991 models [the latest generation of the 911], but more than 20kg is saved in the weight of the engine compared with its predecessor [the 997-generation GT3] and that made the decision even easier. The car had to have PDK. 

“The Doppelkupplungsgetriebe [PDK]of a GT3 must also be fun, involve the driver and add a sporty and emotional value. And it must shift gears faster than any other. And it does. With traction upshifts under full load in up to 100 milliseconds, it holds the technological ‘pole position’ for fast gearchanges. The feeling for the driver is closer to a sequential racing gearbox than to an automated manual. 

“The operating policy is also different for the GT3 [compared with other PDKs]. If the driver opts for the purely manual mode, there is no electronic intervention whatsoever; the car revs into the limiter and accepts downshift commands even in the highest speed ranges. 

“The benefits of PDK do not end with longitudinal dynamics, however. The clutch-operating hydraulic pump inside the PDK provides an indispensable precondition for an improvement in another GT3 core competency: lateral dynamics. It permits the use of an electronically controlled, fully variable rear axle lock, a so-called ‘E-diff’, which would have been almost impossible to integrate into the car with a traditional manual gearbox. 

“It’s also vital to note that we built a 991 GT3 with a manual gearbox and ran it during development alongside prototypes with the PDK – and in all cases, both emotionally and empirically, the PDK came out on top. And that’s why we built the car this way.” 

Ferrari

And what of Ferrari, which pioneered the steering wheel-mounted flappy-paddle gearbox for road cars with the F355 F1 Berlinetta, way back in 1997? 

In the early days, Ferrari’s F1 system was great in theory but didn’t work too brilliantly in practice. Shifts were slow (350 milliseconds versus just 60 milliseconds in the 430 Scuderia), the cars had a habit of eating clutches during hill starts and, in the UK in particular, the initial take-up wasn’t widespread. To begin with, less than 20 per cent of Ferrari’s UK customers went for the F1 system.

But over the years Ferrari – and most other manufacturers, too – have made huge strides with the software and hardware of their paddle-shift gearboxes. By the time the 430 Scuderia was launched in 2007 – with F1 paddle shift only – the tide had well and truly turned.