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CVT-1

Gearbox gripes: Should we hate the CVT as much as we do?

Bundle a bunch of random people into a cramped room, surreptitiously lock the door and quietly introduce the topic of automobile transmissions.

Chances are, the group will immediately fracture into two opposing camps: one overwhelmingly in favour of self-shifting gearboxes and the other doggedly defending their right to change cogs themselves. And possibly a few stragglers more interested in recording a Vine of the impending fist-fight.

But where does the continuously variable transmission fit in (CVT)? Well, while it may strictly be classified as an “automatic gearbox”, it’s also a little different – both in theory and practice. So, what exactly is a CVT and how does it differ from a regular torque converter or dual-clutch transmission?

Simply put, a CVT flits seamlessly through an almost infinite number of gear ratios (between given values, of course), rather than a fixed number of distinct cogs. The result is an inbuilt ability to keep the engine ticking over at its most efficient RPM for any given vehicle speed, which in turn facilitates a significant improvement in fuel economy.

CVT-infographic

Thing is, CVTs are generally entirely uninvolving to use and most feel absolutely nothing like more traditional autos. In fact, driving a CVT-equipped vehicle for the first time – with the accompanying “hair-dryer” drone and “slipping clutch” sensation – can be an utterly odd experience. Hit the loud pedal and the revs rise quickly, before stopping at the most efficient point and staying there as the vehicle steadily accelerates. It’s all rather unfamiliar to the average motorist.

Odd it may be, but there are undeniable advantages to the CVT, even over and above that of efficiency. For example, since this type of transmission requires very few moving parts (simplistically speaking, it’s nothing more than a system of pulleys and belts), wear-and-tear is minimal.

And the “shift shock” experienced with most traditional autos is also eliminated, which makes for a far more comfortable drive. Similarly, acceleration is pleasingly linear, which means a perky engine linked to a CVT can make for a properly fast vehicle – even if it doesn’t feel quick in the traditional sense.

CVTs are becoming more and more popular – so much so that they are no longer limited to low-powered vehicles and runabout hybrids. For instance, Subaru (which makes some of the best CVTs we’ve experienced) has even started offering its Lineartronic CVT on the latest WRX performance sedan.

But not all manufacturers are convinced. In fact, Audi recently announced plans to kill off its “multitronic” CVT, which suggests the German automaker’s next-generation models will instead use an evolution of the popular dual-clutch gearbox (you may well remember Audi settling a 2011 class-action lawsuit over alleged defects with some of its CVTs). Interestingly, Nissan has also had huge problems with its CVTs, resulting in costly repair bills, petitions for recalls, legal action and eventually extended warranties.

Of course, a considerable obstacle facing the CVT is that most drivers simply aren’t accustomed to how it feels, and thus dismiss it out of hand. And, in an attempt to address this very issue, many automakers have added “virtual steps” to their CVTs, bizarrely introducing artificial “shift shock” to make the experience more familiar to motorists. Thing is, adding steps to a stepless transmission is wholly counterproductive and negatively affects efficiency, i.e. the CVT’s main draw-card.

So, should we simply get over our CVT queasiness and embrace the fuel-saving technology for what it is? Should we learn to love ‘em or rather than instinctively loathe ‘em?

Well, it really all depends on what type of driver you are. The driving enthusiast who prefers to be fully in control of the transmission will not be swayed: the much-loved manual gearbox will forever take first place, with a sporty dual-clutch in second, and the dreaded CVT bringing up the rear.

But for the motorist who prefers the convenience of a self-shifter and wants the added benefit of improved efficiency (and doesn’t care one bit about the numb driving experience and unfamiliar noises), the CVT makes as much sense in reality as it does on paper.

And therein lies the answer to our initial question: hate the continuously variable transmission all you want, but it’s here to stay. Why? Well, the world (regrettably) contains far more reluctant drivers than enthusiastic ones…

Author Bio

Ryan Bubear: Columnist
Since majoring in English and Communications far too many moons ago, Ryan has spent all of his time in online media, writing about everything from sport to politics (and other forms of crime). But his true passion – sparked at least partly by a 1971 Austin Mini Mk3 that... More
  • Devin williams

    Imo they should just copy the way CVTs are used in tractors. You set the throttle with a hand lever and the “gas pedal” is actually just controlling the CVT, the further down you press it the higher (or numerically lower) the gear ratio gets. This isn’t even technically an automatic since you are manual “shifting” it.

  • Ryude

    CVT is here to stay because it’s the cheapest to make. Automakers will only give up using them if it impacts sales so much that they start losing money.


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