Chrysler launches new eight-speed transmission
• Chrysler Group LLC is the first North American automaker to offer new eight-speed automatic transmission.
• The new eight-speed transmission coupled to the engine premium V6 VVT has PentastarTM offer an improvement in fuel consumption of more than 10 percent.
• This new 845RE eight-speed transmission will first be offered on models Chrysler 300 and Dodge Charger RWD or AWD equipped with a V6 engine.
• The shortest spacing of gear ratios of the transmission allows the engine to run more low diet, providing better fuel economy.
The first automatic transmission has eight INSTALLED speeds of cars built in North America will appear on the Chrysler 300 2012 and 2012 Dodge Charger built in Brampton, Ontario.
The new eight-speed automatic transmission, made with the permission of ZF and usually reserved for luxury vehicles such as Audi, Bentley, BMW, Range Rover and Rolls Royce, will be available on selected models of the Chrysler 300 and Dodge Charger. Initially, the transmission will be mated exclusively to premium V6 engine 3.6 liter PentastarTM VVT which was launched last year.
Providing additional economy of one liter per 100 kilometers, it allows to the 2012 Chrysler 300 and Dodge Charger 2012 get the best odds EnerGuide fuel consumption on the road in the category, or 6.4 liters per 100 km (44 mi / gal) - an improvement of 12 percent compared to 39 mi / gal of models last year.
The effectiveness of this transmission and its gear ratios EXTENDED also provide the best possible use of city fuel. Both models show an EnerGuide fuel consumption rating of 10.9 liters per 100 km (26 mi / gal) - an improvement of eight percent compared to the five-speed automatic transmission last year. With eight speeds, lead to a diet low in town and on the road also helps reduce emissions by nearly one per cent on the two vehicles.
For those living in harsh climates or who wish to obtain a proven adherence integral transmission, this variant of the transmission will also be available on both models in 2012. Conceived as a modular transmission, the 845RE allows for the addition of the system AWD Chrysler. The integral transmission activates only when needed, without driver intervention, and it helps improve fuel consumption by activating the traction to the front wheels only when slip becomes excessive.
Compact and lightweight, the new transmission requires no structural modification to these two vehicles and, despite the addition of gears, it weighs only 3 kg more than the previous five-speed transmission.
A differential with a total gear ratio of 2.65 to 1 is coupling to the new transmission drive back. The efficiency of the transmission and gear ratios EXTENDED allow the engine to run more often low diet, and use of reports shorter bridge improves even more fuel on the road.
Fully electronic and supported by software that provides a strategy adapted to changes in speed, 845RE has been designed to provide optimal characteristics of changes in speed, consistent with the Chrysler and Dodge brands. The strategy adapted to changes in speed takes into account several variables to determine the speed changes as the engine torque, the kickdown, longitudinal and lateral acceleration, the detection of slope, friction detection and detection of demotion . Other parameters include cruise control the vehicle, activating the Electronic Stability and high temperatures can affect the shifting of the transmission.
Adding gear ratios a transmission helps reduce the gaps normally associated with crossings upshifts and downshifts. Both vehicles have almost imperceptible change reports, including a grace uniform spacing between each report. Spacing very short reports also allows faster acceleration and smoother gear changes.
Large efforts shift have also been eliminated with a selection system changes speed control electric. Selected by the driver (P, R, N, D) is transmitted electronically position without mechanical link from the shifter until the outside of the transmission. The elimination of these links eliminates any effort in the selection of shifting by the driver. Changes speed electrical controls also improve calibration and smooth gear changes in garages and parking lots.
All changes of speed, single, double or multiple, are made directly depending on the position of the accelerator pedal. The passages are lower compared addressed very quickly and are directed directly to the gear wish. Multiple passages superiors reports can be temporarily disconnected if the solicitation torque changes during the transition to higher report. This allows to chafe "research" by the gear transmission.
For more vigorous driving rapid changes in speed and sports are possible thanks to several parameters of a mode change speed "Sport" which requires a simple driver intervention. At the rear of the shifter, a grid allows the driver to select the passage below or above reports. Once the vehicle in "Sport" mode, the driver can use either the lever mounted on the dashboard or a pair of shift paddles montees speeding.
Once the "Sport" mode selects the gear changes are faster and the engine is accelerated to provide acceleration performance and dynamic changes of superior speed.
The acceleration of the Dodge Charger and Chrysler 300 are time from 0 to 100 km / h in 7.2 seconds.
The interior of the 845RE transmission features four gear sets and five items of shift (multidisc clutches and brakes). With fewer items of change open report power losses due to friction between several rooms they are reduced.
The gear ratios of the transmission are:
Speed Pitch Report
1st 4.71
2 3.14 1.50
3 2.10 1.49
4 1.67 1.26
5th 1.29 1.30
1.00 6 1.29
7th 0.84 1.19
0.67 8 1.26
Total spacing 7.03
In addition, using a transmission fluid has lower viscosity, the efficiency of the transmission is improved as well as fuel, especially in cold weather and at startup. The 845RE transmission is also a "full lifetime", requiring no oil change in normal driving conditions.
This new automatic transmission will initially be purchased from ZF, and after its launch it will also be built by Chrysler's plant in Kokomo, with the permission of the German company.
