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Recently updated on October 10, 2023 at 11:51 am
[Update: 10.10.2023] This post was updatedto take more recent information into account. One of the most common names for the sequential transmission is the so-called semi-automatic. The term arises from the transmission's special role as a hybrid of automatic and manual transmission. While operation in full automatic mode has no restrictions, switching in the sequential transmission only allows shifting to the next higher or next lower gear. This limits the freedom a little compared to the normal circuit. The advantage, however, is the elimination of the torque converter, which is conducive to increased consumption due to its low efficiency. Sequential gearboxes are often found on motorcycles.
various technical solutions
An example of sequential transmissions are dual clutch transmissions. In contrast to the fully automatic transmission, which works with a hydraulic torque converter, the torque is transmitted via two clutches in combination with corresponding partial transmissions. Other classic sequential gearboxes include: the drawing wedge gearbox and the bevel gearbox. In a bevel gear transmission, balls are pressed between the shaft and the gear wheel by a cone, which leads to a closure of the gear. The drawing wedge gear, in turn, implements a similar principle using a wedge.
retrofitting a sequential gearbox
There are various options for retrofitting a sequential transmission, but first it must be clarified whether the car is suitable for retrofitting and which manufacturer should be chosen. If retrofitting is possible and the manufacturer has been found, there are two approaches. The first is to hire a professional workshop that specializes in retrofitting sequential gearboxes. The second option, which is riskier and requires more time, is retrofitting the transmission yourself. However, a number of factors that should not be neglected play a role in success, such as your own craftsmanship skills, access to the appropriate parts, precise design ideas for a safe implementation of the conversion and, last but not least, essential basics in car tuning. However, if these points are met, you can also consider upgrading yourself.
elaborate but quite useful in tuning
However, installing a sequential gearbox does not only involve purely technical components. Many people dislike the idea of driving with a purely automatic transmission, as the positive driving experience is closely linked to active intervention in the driving process, for example by shifting up and down. This wish is addressed with a sequential transmission. The switching process can be controlled by simply tapping the shift lever. However, the actual upshifting is still controlled automatically, so that shifting is closer to the optimal point, similar to fully automatic transmission. Last but not least, this means that the engine is protected and essential vehicle components last longer. Apart from that, reversing can also be carried out better with a sequential transmission compared to fully automatic transmission.
FAQ: Sequential gearboxes in detail
1. What exactly is a sequential gearbox and how does it work?
- An sequential circuit is not only found in digital electronics, but also in the automotive industry sequential gearbox known. Gears cannot be skipped and the system shifts systematically from one gear to the next. The sequential transmission allows gears to be shifted in a fixed order, with the driver “counting through” the gears and shifting them up or down in a direct sequence.
2. Why is the DSG (direct shift transmission) also called a sequential transmission?
- DSG, or direct shift transmission, is also called sequential transmission because it follows the definition of sequential shifting, in which gears are shifted in a fixed order. You switch step by stepwithout being able to skip any aisles.
3. What makes sequential transmissions in motorcycles different from other vehicles?
- Motorcycles, as well as some cars, have these Forward gears in a fixed switching line, which appear in a logical order. This shift line shows the clear difference to manual transmissions, where the gears are not in a single, linear arrangement. However, with a sequential transmission, they are arranged in a single, linear path to enable sequential upshifts and downshifts.
4. Which models have sequential gearboxes installed?
Some examples with sequential transmission are:
- SMG (BMW)
- RTronic (e.g. in the Audi R8)
- Smart
- Porsche GT3 CUP (with a six-speed claw gearbox)
Distinction and use
5. How is a sequential automatic transmission defined?
- Sequential automatic transmissions are one type Hybrid between a normal manual and an automatic transmission. Although you shift gears manually with a sequential automatic transmission, there is no clutch pedal that needs to be pressed. This type of gear is often referred to as “semiautomatic“ and offers semi-automated gear shifting so that the driver does not have to use the clutch.
6. Are there differences between sequential and automated manual transmissions?
- Yes, and the main difference lies in the way gears are shifted. With a sequential transmission, gear shifting takes place in a fixed, sequential order. In automated manual transmissions, the term sequential can also be used, with the emphasis being on the precise gear sequence, especially when upshifting.
7. How does the operation and effect of sequential transmissions compare to manual and automatic transmissions?
- While the operation of a sequential transmission may be similar to that of an automatic transmission, its operation is more comparable to a manual transmission. The clutch is operated either by an electric motor or central hydraulics. The shifting process itself can be controlled electronically based on a number of parameters such as vehicle speed, accelerator pedal position and more.
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