Is the dual-clutch the ultimate transmission?

David S.
By David S. Wallens
Jan 19, 2023 | camera, technology, Dual-Clutch Transmission | Posted in Columns | From the May 2010 issue | Never miss an article

Photograph Courtesy Hyundai

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Technology can be hard to accept, especially when it hints at our personal inadequacies. Perhaps that’s why some good ideas are a bit tough to swallow. 

I admit that I’m not immune to having such hard feelings toward a piece of hardware. The first time I felt this way, it was about a camera.

My first real camera was a Canon A-1. Production lasted from 1978 through 1985, and it has gone down in the history books as a really groundbreaking piece of equipment. Even though it didn’t come from Canon’s professional ranks, this camera still raised the bar for the entire industry regarding microprocessor controls. 

Don’t forget: If you go back a few decades, cameras were devoid of computer chips and little black boxes. If a battery was present, it just operated the light meter. For the most part, these were fairly simple machines by today’s standards. Focus and exposure were all handled manually. 

If I had to guess, I got my A-1 around 1983 or so. I was in junior high and my dad, also a photo buff, figured I was ready for a serious camera. He also had an A-1, but mine came courtesy of the used market.

My A-1 faithfully served me through high school and into my first year of college, the corners of its body picking up patina as the plastic wore away to reveal the metal below. Unfortunately, technology eventually caught up with the A-1.

Cameras made huge leaps during the 1980s, and Canon basically rebooted their SLR model line starting in 1987. The new line was known by the EOS name—their latest digital cameras are part of the same family—and one of the biggest changes was a new lens mounting arrangement. 

It wasn’t that I fell under technology’s spell, but if I wanted to add more lenses and accessories to my bag, I needed to upgrade. The new lenses didn’t fit the old camera. I was basically running an unsupported platform.

My parents took me camera shopping sometime in 1989. I can’t remember the store, but something wants me to say that it was on Route 110 on Long Island. What I do remember is the moment the salesman handed over the new EOS. 

 It was sleek and modern. Looking back, it was kind of like a Miata vs. an MGB. Sure, both will yield open-air fun, but obviously one is a later incarnation.

Functional upgrades, the salesman explained, included new shooting modes, LCD display, faster shutter speeds, built-in film winder and autofocus. And right there I started to lose interest. “We don’t need no stinking autofocus,” I said to myself. “I’m a seasoned photographer. I have already been through one full year of college. Of course I know everything.”

If there was a saving grace, it was a small button found on the barrel of the lens: The autofocus could easily be switched off. 

I saw autofocus as something unnecessary that also added weight, cost and complexity. On the other hand, there was no way to get away from it. Autofocus had become an industry standard, just like fuel injection and radial tires. I was eventually the proud owner of a brand-new Canon EOS 630 and matching lens.

The kicker to that story: I don’t think I ever used the manual focus mode. Autofocus let me do all kinds of cool things, like shoot with the camera held high above my head or down on the ground. I could also pop off photos more quickly—just compose and squeeze. Call me an instant convert.

Who knows how many photos I have shot since that day 21 years ago. A million? A zillion? A kajillion? Okay, maybe it’s a more manageable number.

One thing I am sure of is that the autofocus rarely let me down, and through the years it has only gotten better, faster and lighter. At the same time it has offered more control. The latest Canons offer 45 focus points, which is 44 more than my first EOS had. 

The dual-clutch transmissions showing up in so many showrooms may be the automotive equivalent of autofocus. These new transmissions have many benefits, yet are taking some heat from the hardcore enthusiasts. The complaints include the added weight, cost and complexity—all arguments I have heard before.

The dual-clutch transmission is an engineering marvel. Odd gears are housed on one input shaft, while the even ones live on the other. Each input shaft gets its own clutch, hence the dual-clutch designation.

This arrangement allows gears to be engaged before they’re needed. When the time comes to shift gears—bang—it happens right away. The gearbox’s ECU knows what is going on and the time needed to switch between gears is measured in milliseconds.

Manual control is also possible by using buttons mounted on the steering wheel and/or a lever that more or less resembles the traditional stick. However, there are only two pedals: stop and go. The traditional clutch pedal has been dismissed.

I think some of the bad rap comes courtesy of the sins delivered by the traditional automatic transmission, which in our automotive world has only really been favored by Jim Hall, drag racers and those campaigning F Stock Camaros. Aside from limited examples, for the most part automatic transmissions have been associated with slow performance, a limited number of gears, and not much manual control.

Oh, how technology has drastically changed things. Yes, dual-clutch transmissions are heavier, pricier and more complex than the traditional stick shift, but there’s no denying that these new boxes offer quicker acceleration as well as better economy. Hey, let’s face it, a computer-controlled, seven-speed gearbox will generally outperform five or six gears being rowed by a human.

Where can you find this new technology? All over. It’s the only transmission type offered in the Nissan GT-R as well as all current Ferrari road cars. Porsche is quickly making it available in nearly their entire model line, while VW and Audi have shown that this kind of hardware isn’t limited to cars north of six figures.

I wonder if there’s a deeper issue fueling this ire, as gearheads rarely pass up something that makes them faster: It’s tough to admit that technology can best us at something that’s seen as a core element of a favorite activity. Rowing up and down the gears has been an integral part of sports car ownership for decades, and few are willing to hand that over.

Just like ABS, fuel injection, windup windows, automatic chokes, overhead cams and electric starters, dual-clutch transmissions may take some time to catch on among the hardcore drivers. However, I think I can see the attraction.

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Comments
APEowner
APEowner GRM+ Memberand Dork
11/18/20 10:36 a.m.

There's no question that a modern DTC is an engineering marvel and can shift faster than I can.  In addition the calibration in high end cars is amazing.  Most of them make gear selections on track that mirror what a good driver would be doing manually so there's no need to mess around with the paddle shifters.  Just let them do their thing, focus on your driving and enjoy the awesome sound track as they bang through the gears on the way up and rev match on the downshifts.

The thing is though, just being as fast as possible isn't necessarily the point.  Sure, if I'm racing then I want the fastest stuff that's legal but if I'm driving for the joy of driving then something that will shave fractions of a second (or even full seconds) off my lap times is largely irrelevant.  Particularly on public roads.  That's when a good manual gear box is irreplaceable.  I just enjoy making smooth fast upshifts, rev matching heal toe downshifts and selecting the right gear at the right time.  I don't care that a computer could do it better.

As far as autofocus cameras are concerned my eyesight makes is so I can't focus one manually anyway.

SammyPati
SammyPati New Reader
11/19/20 4:25 a.m.

APEowner , Im with you 100%

who cares that a computer can change gears in a nanosecond. If that what people want, then driverless cars will make them even more happy!

 

ShinnyGroove (Forum Supporter)
ShinnyGroove (Forum Supporter) Reader
11/19/20 5:57 a.m.

The comparison in the article is perfect. I like driving a manual and I'm glad I still get to do it in my race car. But the PDK in my Cayman has made me an absolute religious convert- such a superior technology.  So much more effective power when the car can always be in the power band. Such amazing sounds and performance.  So much less dreadful in traffic, meaning my "nice" car is enjoyable for ordinary life stuff too. 

This subject seems to bring out passionate responses from car guys, but I wish more of them had the chance to drive one of the really good DCT's before rushing to judgement. 

Pete. (l33t FS)
Pete. (l33t FS) GRM+ Memberand MegaDork
11/19/20 6:02 a.m.
SammyPati said:

APEowner , Im with you 100%

who cares that a computer can change gears in a nanosecond. If that what people want, then driverless cars will make them even more happy!

 

It's not all or nothing, it's a sliding scale.  I like to shift for myself but I giggle when the computers do it rapidly and seamlessly, with rev matching like no human could ever achieve. 

 

I like letting a computer control fuel mixture and ignition timing, too!  Some people probably have a problem with that and want to go back to having a mixture lever and timing lever on the steering column, like in the days of fuel of wildly variable quality and hand cranking, so they can be REALLY in control of the driving experience.

maj75 (Forum Supporter)
maj75 (Forum Supporter) HalfDork
11/19/20 7:09 a.m.

Head over to the Porsche forum where folks with PDK failures at less than 50k miles are getting a $16-23k bill from Porsche for a replacement.  Ask how they like the new technology.

alfadriver (Forum Supporter)
alfadriver (Forum Supporter) MegaDork
11/19/20 7:25 a.m.
ShinnyGroove (Forum Supporter) said:

The comparison in the article is perfect. I like driving a manual and I'm glad I still get to do it in my race car. But the PDK in my Cayman has made me an absolute religious convert- such a superior technology.  So much more effective power when the car can always be in the power band. Such amazing sounds and performance.  So much less dreadful in traffic, meaning my "nice" car is enjoyable for ordinary life stuff too. 

This subject seems to bring out passionate responses from car guys, but I wish more of them had the chance to drive one of the really good DCT's before rushing to judgement. 

The problem with the comparisons is that the dual clutch trans doesn't actually provide a brand new feature to cars.  Automatic shifting transmissions have been around for many decades, this is just a different way of doing the same feature.  For mass market car makers, it's a cheaper version of the auto trans.  For the niche makers, this is a way to provide an auto trans that makes it seems sporty.

In no way, shape, or form should the Ford Focus DST be considered sporty- that was never it's intention, ever.

docwyte
docwyte UberDork
11/19/20 8:08 a.m.

McLaren isn't calling any of us.  Driving for us is about involvement and feel, the connection to the car and making it do what we want.  A DSG is just a fancy automatic transmission and doesn't give any of that.

Paul_VR6 (Forum Supporter)
Paul_VR6 (Forum Supporter) Dork
11/19/20 8:12 a.m.

Converting from a 5sp manual to a DSG myself this winter in my race car. Same $ as a dog engagement transmission without the wear issues. Taking over complete mech control with a standalone controller so I can program it how I want. Sure I don't get to shift, but I don't get to miss shifts any more either. Nothing quite sounds or feels like shifts that are tens of ms. I think some of the haters need to ride in a dsg car that's set on kill, it's wild.

spacecadet (Forum Supporter)
spacecadet (Forum Supporter) GRM+ Memberand SuperDork
11/19/20 8:31 a.m.
alfadriver (Forum Supporter) said:
ShinnyGroove (Forum Supporter) said:

The comparison in the article is perfect. I like driving a manual and I'm glad I still get to do it in my race car. But the PDK in my Cayman has made me an absolute religious convert- such a superior technology.  So much more effective power when the car can always be in the power band. Such amazing sounds and performance.  So much less dreadful in traffic, meaning my "nice" car is enjoyable for ordinary life stuff too. 

This subject seems to bring out passionate responses from car guys, but I wish more of them had the chance to drive one of the really good DCT's before rushing to judgement. 

The problem with the comparisons is that the dual clutch trans doesn't actually provide a brand new feature to cars.  Automatic shifting transmissions have been around for many decades, this is just a different way of doing the same feature.  For mass market car makers, it's a cheaper version of the auto trans.  For the niche makers, this is a way to provide an auto trans that makes it seems sporty.

In no way, shape, or form should the Ford Focus DST be considered sporty- that was never it's intention, ever.

The DCT does provide a new feature to cars, It allowed for an automatic transmission without a drivability penalty and without performance penalty. having had to the chance to drive DCT/DSG cars in anger and on the street I've found myself a fan just like SHinygroove. You get all the performance benefits and it's still super tame to daily drive.

And this is NOT a cheaper version of the automatic transmission.

BTW, focus transmission was not a DCT, the focus used an automated manual transmission with a single dry clutch and is not related to the DCT.

 

350z247
350z247 New Reader
11/19/20 8:39 a.m.

In reply to APEowner :

I agree 100%. In a race class, I'd take a modern DCT or even an 8 speed ZF auto over a manual transmission; it's just one less thing to worry about while I'm trying to maximize the performance of the car. Yet my daily is always a manual. At 8/10ths on a mountain road, it's just one more level of engagement. Even just rowing through the gears after a stop is enough to make the morning commute a little more exciting.

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