7G-TRONIC
Encyclopedia
7G-Tronic is Mercedes-Benz
's trademark
name for its seven-speed automatic transmission
. This fifth-generation transmission was introduced in the Autumn of 2003 on 8-cylinder models, and was the first seven-speed automatic transmission ever used on a production vehicle.
The 7G-Tronic debuted on five different eight-cylinder models: the E500
, S430
, S500
, CL500
, and SL500
. It is also available on some six-cylinder models including the new 320 CDI engines which uses a VTG turbo charged common rail diesel engine
.
However, all V12-powered cars such as the S600 and S65 AMG still retain the 5G-Tronic
, which has a torque capacity of 796 lbft, as the newer 7G-Tronic is limited to 542 lbft, not enough to handle the torque from the V12 engine. Also, while rear-wheel drive W211 E-Class cars have adapted the 7G-Tronic, these with 4MATIC retain the five-speed automatic, although the next-generation W212 E-Class released for the 2010 model year adopted 7G-Tronic all across the lineup including 4MATIC.
The company claims that the 7G-Tronic can save up to 0.6 litres of fuel per 100 kilometers (depending on the car) and has shorter acceleration times and quicker intermediate sprints than the outgoing 5-speed automatic transmission.
The 7G-Tronic has two reverse gear ratios: 3.416 and 2.231. The winter mode, also recently named 'comfort' mode, starts out in 2nd forward and 2nd reverse.
The transmission can skip gears when downshifting, allowing for quicker acceleration. It also has a lockup torque converter on all seven gears, allowing better transmission of torque for improved acceleration. The transmission's case is made of magnesium
, a first for the industry, to save weight.
The 7G-Tronic is the fifth-generation transmission for Mercedes-Benz. About 65 percent of Mercedes-Benz C-Class
sedans, wagons, and sport coupes are purchased with automatic transmissions (with that figure rising). However, about 88 percent of Mercedes-Benz E-Class
sedans and wagons are purchased with automatic transmissions, and automatic transmissions are standard on the Mercedes-Benz S-Class
.
The 7G-Tronic transmission is built at the Mercedes-Benz Stuttgart
-Untertuerkheim plant in Germany
, the site of Daimler-Benz
's original production facility.
The 7G-Tronic is currently available on the SsangYong Chairman W
.
In July 2009, Mercedes-Benz announced they are working on a new nine-speed automatic.
developed the 7-speed MCT "Multi Clutch Technology" planetary semi-automatic transmission
.
The MCT transmission is essentially the 7G-Tronic automatic transmission without a torque converter. Instead of a torque converter, it uses a compact wet startup clutch to launch the car from a stop, and also supports computer-controlled double declutching. The MCT (Multi-Clutch Technology) acronym refers to a planetary (automatic) transmission’s multiple clutches and bands for each gear.
The MCT is fitted with four drive modes: “C” (Comfort), “S” (Sport), “S+” (Sport plus) and “M” (Manual) and boasts 100 millisecond shifts in "M" mode. MCT-equipped cars are also fitted with the new AMG DRIVE UNIT with innovative Race Start function. The AMG DRIVE UNIT is the central control unit for the AMG SPEEDSHIFT MCT 7-speed sports transmission and all driving dynamics functions. The driver can change gears either using the selector lever, or by nudging the steering-wheel shift paddles. The new Race start Function is a launch control system which enables the driver to call on maximum acceleration, while ensuring optimum traction of the driven wheels.
It is available on the 2009 SL 63 AMG
and E63 AMG, and will be used for the 2011 S63 AMG and CL63 AMG, and the 2012 CLS63 AMG and C63 AMG.
In 2007, 7G TRONIC transmission with AMG SPEEDSHIFT was also called '7G TRONIC Sport'.
Mercedes-Benz
Mercedes-Benz is a German manufacturer of automobiles, buses, coaches, and trucks. Mercedes-Benz is a division of its parent company, Daimler AG...
's trademark
Trademark
A trademark, trade mark, or trade-mark is a distinctive sign or indicator used by an individual, business organization, or other legal entity to identify that the products or services to consumers with which the trademark appears originate from a unique source, and to distinguish its products or...
name for its seven-speed automatic transmission
Automatic transmission
An automatic transmission is one type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually...
. This fifth-generation transmission was introduced in the Autumn of 2003 on 8-cylinder models, and was the first seven-speed automatic transmission ever used on a production vehicle.
The 7G-Tronic debuted on five different eight-cylinder models: the E500
Mercedes-Benz E-Class
The Mercedes-Benz E-Class is a range of executive-size cars manufactured by Mercedes-Benz in various engine and body configurations. The E initially stood for Einspritzmotor, ; a new feature in volume production vehicles at the time that the E-Class first appeared, with the E as a suffix to the...
, S430
Mercedes-Benz S-Class
The Mercedes-Benz S-Class is a series of luxury sedans produced by Mercedes-Benz, a division of Daimler AG. The classification was officially introduced in 1972 with the W116 S-Class, which succeeded previous Mercedes-Benz models dating to the mid-1950s...
, S500
Mercedes-Benz S-Class
The Mercedes-Benz S-Class is a series of luxury sedans produced by Mercedes-Benz, a division of Daimler AG. The classification was officially introduced in 1972 with the W116 S-Class, which succeeded previous Mercedes-Benz models dating to the mid-1950s...
, CL500
Mercedes-Benz CL-Class
The Mercedes-Benz CL-Class is a luxury coupé automobile produced by the German automaker Mercedes-Benz. The name CL stands for the German Comfort Leicht ....
, and SL500
Mercedes-Benz SL-Class
The Mercedes-Benz SL is a grand tourer manufactured by Mercedes since 1954. The designation SL derives from the German Sport Leicht, or Sport Lightweight — and was first applied to the 300SL 'Gullwing' named also after its gullwing or upward-opening doors.The term SL-Class refers to the...
. It is also available on some six-cylinder models including the new 320 CDI engines which uses a VTG turbo charged common rail diesel engine
Common rail
Common rail direct fuel injection is a modern variant of direct fuel injection system for petrol and diesel engines.On diesel engines, it features a high-pressure fuel rail feeding individual solenoid valves, as opposed to low-pressure fuel pump feeding unit injectors...
.
However, all V12-powered cars such as the S600 and S65 AMG still retain the 5G-Tronic
5G-Tronic
The Mercedes-Benz 5G-TRONIC is an electronically shifted 5-speed overdrive automatic transmission. It is in the process of being replaced by the Mercedes Benz 7G-Tronic Transmission which was introduced in 2003...
, which has a torque capacity of 796 lbft, as the newer 7G-Tronic is limited to 542 lbft, not enough to handle the torque from the V12 engine. Also, while rear-wheel drive W211 E-Class cars have adapted the 7G-Tronic, these with 4MATIC retain the five-speed automatic, although the next-generation W212 E-Class released for the 2010 model year adopted 7G-Tronic all across the lineup including 4MATIC.
The company claims that the 7G-Tronic can save up to 0.6 litres of fuel per 100 kilometers (depending on the car) and has shorter acceleration times and quicker intermediate sprints than the outgoing 5-speed automatic transmission.
The 7G-Tronic has two reverse gear ratios: 3.416 and 2.231. The winter mode, also recently named 'comfort' mode, starts out in 2nd forward and 2nd reverse.
The transmission can skip gears when downshifting, allowing for quicker acceleration. It also has a lockup torque converter on all seven gears, allowing better transmission of torque for improved acceleration. The transmission's case is made of magnesium
Magnesium
Magnesium is a chemical element with the symbol Mg, atomic number 12, and common oxidation number +2. It is an alkaline earth metal and the eighth most abundant element in the Earth's crust and ninth in the known universe as a whole...
, a first for the industry, to save weight.
The 7G-Tronic is the fifth-generation transmission for Mercedes-Benz. About 65 percent of Mercedes-Benz C-Class
Mercedes-Benz C-Class
The Mercedes-Benz C-Class is a compact executive car produced by the Mercedes-Benz division of Daimler AG. First introduced in 1993 as a replacement for the 190 range , the C-Class was the smallest model in the marque's lineup until the 1997 arrival of the A-Class...
sedans, wagons, and sport coupes are purchased with automatic transmissions (with that figure rising). However, about 88 percent of Mercedes-Benz E-Class
Mercedes-Benz E-Class
The Mercedes-Benz E-Class is a range of executive-size cars manufactured by Mercedes-Benz in various engine and body configurations. The E initially stood for Einspritzmotor, ; a new feature in volume production vehicles at the time that the E-Class first appeared, with the E as a suffix to the...
sedans and wagons are purchased with automatic transmissions, and automatic transmissions are standard on the Mercedes-Benz S-Class
Mercedes-Benz S-Class
The Mercedes-Benz S-Class is a series of luxury sedans produced by Mercedes-Benz, a division of Daimler AG. The classification was officially introduced in 1972 with the W116 S-Class, which succeeded previous Mercedes-Benz models dating to the mid-1950s...
.
The 7G-Tronic transmission is built at the Mercedes-Benz Stuttgart
Stuttgart
Stuttgart is the capital of the state of Baden-Württemberg in southern Germany. The sixth-largest city in Germany, Stuttgart has a population of 600,038 while the metropolitan area has a population of 5.3 million ....
-Untertuerkheim plant in Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...
, the site of Daimler-Benz
Daimler-Benz
Daimler-Benz AG was a German manufacturer of automobiles, motor vehicles, and internal combustion engines; founded in 1926. An Agreement of Mutual Interest - which was valid until year 2000 - was signed on 1 May 1924 between Karl Benz's Benz & Cie., and Daimler Motoren Gesellschaft, which had...
's original production facility.
The 7G-Tronic is currently available on the SsangYong Chairman W
SsangYong Chairman
SsangYong renamed pre-2008 Chairman model as Chairman H to differentiate from Chairman W. Chairman H kept same exterior, interior, engine, transmission and features as the previous models...
.
In July 2009, Mercedes-Benz announced they are working on a new nine-speed automatic.
AMG SpeedShift MCT
Mercedes-AMGMercedes-AMG
Mercedes-AMG GmbH, commonly known as AMG, is a subsidiary of the Mercedes-Benz car company specializing in high-performance luxury cars....
developed the 7-speed MCT "Multi Clutch Technology" planetary semi-automatic transmission
Semi-automatic transmission
A semi-automatic transmission is an automobile transmission that does not change gears automatically, but rather facilitates manual gear changes by dispensing with the need to press...
.
The MCT transmission is essentially the 7G-Tronic automatic transmission without a torque converter. Instead of a torque converter, it uses a compact wet startup clutch to launch the car from a stop, and also supports computer-controlled double declutching. The MCT (Multi-Clutch Technology) acronym refers to a planetary (automatic) transmission’s multiple clutches and bands for each gear.
The MCT is fitted with four drive modes: “C” (Comfort), “S” (Sport), “S+” (Sport plus) and “M” (Manual) and boasts 100 millisecond shifts in "M" mode. MCT-equipped cars are also fitted with the new AMG DRIVE UNIT with innovative Race Start function. The AMG DRIVE UNIT is the central control unit for the AMG SPEEDSHIFT MCT 7-speed sports transmission and all driving dynamics functions. The driver can change gears either using the selector lever, or by nudging the steering-wheel shift paddles. The new Race start Function is a launch control system which enables the driver to call on maximum acceleration, while ensuring optimum traction of the driven wheels.
It is available on the 2009 SL 63 AMG
Mercedes-Benz SL-Class
The Mercedes-Benz SL is a grand tourer manufactured by Mercedes since 1954. The designation SL derives from the German Sport Leicht, or Sport Lightweight — and was first applied to the 300SL 'Gullwing' named also after its gullwing or upward-opening doors.The term SL-Class refers to the...
and E63 AMG, and will be used for the 2011 S63 AMG and CL63 AMG, and the 2012 CLS63 AMG and C63 AMG.
Gear ratios
| Gear | 1 | 2 | 3 | 4 | 5 | 6 | 7 | R-1 | R-2 | Final |
|---|---|---|---|---|---|---|---|---|---|---|
| 7G TRONIC | 4.377 | 2.859 | 1.921 | 1.368 | 1.00 | .82 | .728 | 3.416 | 2.231 | ? |
| AMG-SpeedShift 7G TRONIC (Mercedes-Benz R171 Mercedes-Benz R171 R171 represents the second generation of Mercedes-Benz SLK and is slightly larger than its predecessor the R170. The Mercedes-Benz SLK-Class is a luxury roadster built by the German manufacturer Mercedes-Benz since 1997... SLK 55 AMG) |
4.38 | 2.86 | 1.92 | 1.37 | 1.00 | .82 | .73 | 3.41 | ? | 3.06 |
AMG SpeedShift (2004-)
The performance features found in 5G-Tronic family was first used in 2004 Mercedes-Benz SLK 55 AMG.In 2007, 7G TRONIC transmission with AMG SPEEDSHIFT was also called '7G TRONIC Sport'.