Dct Gearbox

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Most of the cars right now that are sold in the Indian market do get the option of an automatic gearbox. But the choice is not only between an automatic and a manual gearbox. Even in an auto gearbox there are different types of gear systems such as an AMT, torque converter, CVT, AT and DCT that are available right now in different cars and in different price points. We help you choose the right type of gearbox according to your priority.

AMT gearbox

This is an automated manual transmission. It is a kind of manual gearbox mechanically although it has a system that changes the gears for you. The gear shifts are jerky and not at all instantaneous. But you do get the comfort of now having to continuously shift gears in traffic. The biggest advantage is that these gearboxes are not that much more expensive than the manual ones and they also give better mileage than the torque converters. This is basically somewhere in between manuals and automatics and can be called as a budget automatic.

CVT

The new seven-speed automatic gearbox (DCT) takes the best of manual and automatic transmissions and combines them to deliver faster gear changes. Update: first Kia to be available with new 7-speed DCT is the 2016 Optima LX 1,6T. A DCT, on the other hand, is truly a manual transmission that has been automated (Figure 1). A basic difference between sticks and automatics has been in the gearing – planetary vs. Honda’s automatics are a departure from that scenario because of not using planetaries, although the rest of the transmission is automatic. The 8DCL900 is a two-shaft dual-clutch transmission for longitudinal installation with front or mid-mounted engines. It is designed for an input torque of 900 Nm and engine speeds of up to 10,000 rpm. With a view to further future applications, the 8DCL900 also offers flexible possibilities for use in electrified sports vehicles. A technology that brings the fundamentals of motorcycles - the joy of riding and control, to a whole new level.The DCT (Dual Clutch Transmission) technology by Honda. The world's first in motorcycles.Welcome to the world of DCT.

This system is a continuously variable transmission.It has a sort of a rubber band effect and basically feels like one gear itself when you drive the car. The gearbox is linear and you do get the advantage of fuel efficiency in this kind of gearbox but the shifts are a bit laggy. This could be a problem for enthusiasts as it is not very quick in terms of gear shifting. For city traffic, this would be a very good gearbox as it is very smooth. The mileage of this kind of gearbox is a very big strong point.

AT

This is the said normal kind of gearbox known as a torque converter which is seen on most automatic cars. The gear shifts are relatively smoother but it does miss out on a bit of performance from the petrol if compared to a manual or a DCT. The disadvantage of this gearbox is that it does take a toll on fuel efficiency and there is a significant difference which can be seen in terms of mileage. It is not as laggy as a CVT and therefore can be driven in a dynamic way as well.

DCT

This is currently the best kind of gearbox that is available. The gear shifts are very smooth and very quick as well. The most important thing is that the car can quickly change gears and give in to your demand of instant power which is often not met with automatic gearboxes. Basically, this kind of a gearbox uses two clutches; one for the even gears and one for the odd, and therefore the clutch is continuously engaged so that there will not be any kind of delay when it comes to the shifting of the gears.

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Pricing

Now, it is important to not that although you can differentiate gearboxes in these terms, but all manufacturers calibrate their gearboxes differently and two different cars having the same power and same kind of gearbox can feel different in terms of driving. Also the weight of all the gearboxes will be significantly heavier than the manual except the AMT. Usually in cars around the 10 lakh range the AMT costs about 50,000-70,000 more expensive than the manual variant. The torque converter cost about 1-1.5 lakh more than the manual and the DCT and CVT cost about 1.5 lakh rupees more. For reference, you can also check the new Volkswagen Vento that had a DSG gearbox which is essentially a DCT gearbox and in the new model it will get a torque converter.

Photo: The News Wheel

Many drivers treat their car’s dual-clutch transmission in the same way that they would drive a car that had an automatic transmission. But, a dual-clutch transmission is more like a manual transmission than automatic. And if you don’t treat it properly, you could permanently damage it.

Some of your current driving habits could ruin a dual-clutch transmission. If you’re doing any of the following and your car has a DCT, cut it out!

Is Your Car Having Trouble Driving?Take action if any of these warning indicator lights are illuminated

Habits to avoid so you don’t ruin a dual-clutch transmission

Stop taking your foot off the brake

If you have a tendency to let your DCT sit without applying the brakes, such as waiting in traffic or at the foot of an incline, you could be wearing out the clutch pack. When the brakes aren’t applied, some DCTs will make the clutches continually slipping to keep you in place. This depends on how your transmission operates, but you could be putting extra heat and wear on the clutch pack.

How To Drive Dct Gearbox

Stop putting the car in neutral

Those who are used to driving stick shifts might have a habit of putting their car in neutral when they’re fully stopped at an intersection. You don’t need to do this with a dual-clutch transmission. The car will intuitively release the clutches when you’re braking, so there’s no point switching out of Drive.

If you do ever put the car in neutral, keep the brake depressed when shifting into and out of neutral to protect the clutch.

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Stop launching improperly

In sportier cars with dual-clutch transmissions, drivers like to launch from a stand-still, but doing so incorrectly can severely damage the gearbox and clutch disks. Don’t hold the brake pedal while you’re revving the gas because the clutch will take damage trying to move the car while you’re fighting it with the brakes. In general, never accelerate the engine when the brakes are applied.

Stop keeping the car in place by accelerating

Dct Gearbox

If you’re sitting on an incline, don’t repeatedly tap the acceleration pedal to keep your position. The same goes for putting the car in reverse and accelerating backward to stop from rolling down a hill. Both practices will quickly overheat the clutch. Use the brakes instead.

Clutch behavioral logic and functions vary from manufacturer to manufacturer, so research your specific model to find out how to properly operate. Your car’s owner’s manual will have a lot of information on proper handing to not ruin a dual-clutch transmission.

Rexnord Gearbox Parts Manual

Sources:Engineering Explained, 2014 Hyundai Veloster owner’s manual

7 Speed Dual Clutch Automatic

Aaron is unashamed to be a native Clevelander and the proud driver of a Hyundai Veloster Turbo (which recently replaced his 1995 Saturn SC-2). He gleefully utilizes his background in theater, literature, and communication to dramatically recite his own articles to nearby youth. Mr. Widmar happily resides in Dayton, Ohio with his magnificent wife, Vicki, but is often on the road with her exploring new destinations. Aaron has high aspirations for his writing career but often gets distracted pondering the profound nature of the human condition and forgets what he was writing… See more articles by Aaron.