At present, the main models of Tiggo 8 on sale are 1.6TGDI direct injection engine and 1.5T EFI engine, with automatic transmission as the main type. 1.5T engine is matched with a dry six-speed dual-clutch gearbox, and 1.6T is matched with a seven-speed wet dual-clutch gearbox, so today I will give those to 1.5T and 6544.

First of all, the two gearboxes, whether dry or wet, have good reliability. In the early days, some models of Volkswagen and Ford had many problems when matching dual-clutch gearboxes, such as overheating alarm, which made prospective car owners tremble, and with the help of the media, many people shouted the slogan of not buying dual-clutch gearboxes. AT first, I was a little afraid of dual-clutch gearbox, and I always thought AT was excellent.

However, after several years of observation, personal use and test drive, it is found that other brands dare not say that Chery's dual-clutch gearbox has no reliability problems.

First, take the dry six-speed dual clutch as an example. Although in principle, its reliability and service life are definitely worse than that of the seven-speed wet dual clutch, taking Chery as an example, this dry dual clutch has actually been tested far more than the wet dual clutch. Mainly because when Chery first started to use the dual clutch gearbox, there was only a dry six-speed gearbox, but there was no wet dual clutch, so from the beginning of Qoros to the later Tiggo 7, Chery used the dry dual clutch almost four or five years earlier than the wet dual clutch, and during this period, almost all the main models of Chery used the dry six-speed dual clutch gearbox as the absolute main gearbox model, and produced and distributed goods in large quantities.

Generally speaking, if there is a hidden danger in a gearbox, the problem will be exposed after hundreds of thousands of car owners across the country use it intensively under various working conditions. But so far, no batch failures of dry six-speed dual-clutch gearbox have been found, so it can be concluded that this dry six-speed dual-clutch gearbox used by Chery has no reliability problem.

As for the seven-speed wet dual-clutch gearbox, in terms of its principle and structure, it is naturally more durable than the dry six-speed dual-clutch gearbox. Because of oil lubrication and cooling, it is more difficult to overheat and wear excessively.

In fact, according to my communication with senior people in the industry, the wet clutch friction plate with wet dual clutch is actually a very durable structure, because there are similar structures on some motorcycles. These friction plates were found during maintenance and disassembly. Even after being used for a long time with high strength above100000 km, the wear of the friction plate is very slight, so it has strong reliability and long service life. If it is purely for home use, it will not be similar to the AT gearbox. By the way, don't get me wrong. The at gearbox won't break down, but all mechanical products will have a certain failure rate. AT gearbox has the longest service life, but it is not desirable according to myth. In fact, I also asked some maintenance workers that the at gearbox they are repairing is bigger than the dual clutch.

After talking about reliability, let's talk about their advantages.

First of all, the shift is fast and the response is fast. In addition, the power transmission of the dual clutch gearbox is hard-connected. Theoretically, the transmission efficiency is the same as that of manual gear, so it will bring two advantages: fast speed increase and fuel saving. We can look at the models that use dual-clutch gearboxes in the market, such as Volkswagen series, which generally have low fuel consumption, and Chery's models that use dual-clutch gearboxes are also very fuel-efficient. For example, my Tiger Eight is a dry six-speed dual-clutch gearbox, and my pure national highway has a minimum fuel consumption of 5.8.

In addition, after a lot of statistics, I found that the fuel consumption level of dry six-speed 1.5T Tiger Eight and seven-speed wet double clutch 1.6T Tiger Eight is similar. On average, the fuel consumption of 1.6T Huba is a little lower, but the difference is relatively small. Mainly reflected in my statistics of almost 100 car owners in Hu Ba, the ultra-low fuel consumption of 1.6T Hu Ba is obviously more than that of 1.5T Hu Ba, while the relatively high fuel consumption of1/oil is much less than that of 1.5T, in the middle.

Let's talk about their shortcomings first

Whether it is dry or wet dual clutch, as long as it is a dual clutch gearbox, it has the same shortcomings, that is, there is still a gap between the ride comfort and the gearbox that is really good at it. However, it should be noted that, thanks to Chery's powerful adjustment ability, the gap between the ride comfort of Chery's dual-clutch models and the good models is very small, especially the gap between the seven-speed wet dual-clutch models is almost negligible.

Specifically, the seven-speed wet dual-clutch gearbox has better ride comfort than the dry six-speed, and the gap with high-quality AT is reflected in the initial stage, mainly because the throttle accuracy is not enough, or the throttle is not enough to follow the foot. You need to control the rhythm of stepping on the accelerator slightly to get a smooth driving experience, so driving a dual-clutch car requires a little driving skills, especially the throttle control skills. If you know how to slam on the accelerator and brake, it will be easy to drive one car after another.

Moreover, in the initial stage, if you step on the accelerator too deeply or the floor is oily, then the dual-clutch model will not jump out immediately, but will stop for half a second or a third of a second before rushing out.

In addition, on the wet double-clutch Tiger Eight, occasionally when the second gear is upgraded to the third gear, if people who are particularly careful understand it carefully, they can feel a slight power interruption temporarily, but this has no effect on driving, and not everyone can drive it out.

In a word, whether it's a dry double clutch or a wet double clutch Tiger Eight, if you have certain driving skills, you can easily drive smoothly and won't feel any difference at all.

Of course, all of the above are in ECO mode. I tend to equate ECO mode with smooth mode. If you use sports mode, the feeling of frustration under the floor oil is obvious. I have said many times before that the gearbox can't be adjusted, smooth and dynamic. If you like racing, please bear the frustration. You can't have it both ways.

When it comes to ride comfort, the difference between the two is obvious. The seven-speed wet dual-clutch Tiger Eight is smoother, especially at low speed, and the speed is really running. There is basically no difference between the two, and they are both very smooth. When there is a traffic jam in the city, I always crawl with one foot on the accelerator and one foot on the brake, and occasionally there will be obvious setbacks. My understanding is that the brain of the gearbox is a little insufficient to accurately understand your intention, but it should be noted that this is accidental, not to say that it will be frustrated every time, but in general, compared with the wet dual clutch, the crawling performance of the dry six-speed dual clutch gearbox is a bit rough in low-speed traffic jams. However, the performance of the wet dual-clutch Tiger Eight in the same low-speed traffic jam is much better. Although there are occasional setbacks, the degree of setbacks is much smaller and the frequency of them is lower than that of dry ones.

However, this is normal. After all, the cost of wet dual-clutch gearbox is higher, and the corresponding car price is much more expensive than that of dry gearbox.

By the way, I can confirm one thing. The seven-speed wet dual-clutch gearbox used by Hu Ba is exactly the same as the BMW X 1 model. Chery is really cheap. . . . .

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This article comes from car home, the author of the car manufacturer, and does not represent car home's position.