A milestone in the history of Lamborghini: The new twelve-cylinder and the new ISR tr
#21
11-15-2010, 11:39 PM
Guys-
This is just the beginning. Wait until you see the entire project complete. I'm still in shock. Taking orders now...
This is just the beginning. Wait until you see the entire project complete. I'm still in shock. Taking orders now...
#22
11-16-2010, 08:15 AM
I still think Lambo went the cheap and easy way with the gearbox. They are trying very hard to make it look like their single clutch transmission is an even better option but as far as I recall Lambo chose not to develope a dct because it would cost too much.
#23
11-17-2010, 02:21 PM
Not absolutely right actually. Audi has advanced DCT technology and experience. Graziano just developed the smallest and lighest possible DCT for MP4-12C. I think there were huge possibilities for Lamborghini to find the way how to develop a DCT for LP700-4.
Money and time weren't the main reason why, it wasn't made because of few reasons - first of all they are sure at Lamborghini that this new gearbox will be better and lighter in one package. Second thing - probably they want to give some space for further development of the car. According to what I was told G-successor which will be cheaper of course will have DCT and will share it with next generation of R8.
Actually its hard to compare gearboxes without having really enjoyed various sportscars with DCT and automated manual. DCT has many advantages of course, but really lacks emotions. I have some real life exprerience here and I am saying this absolutely serious.
Pagani will follow the same road and use rather similar gearbox in C9, but from different maker. Similar ISR gearbox made also by Graziano which is used in LP700-4 probably will be used in another very interesting italian halo car, so it hardly be described as a poor choice, just wait and see how it performs
Press release on the gearbox:
The new Lamborghini ISR transmission (ISR: Independent Shifting Rods) - Innovative servo-actuated mechanical gearbox for maximum performance
However, it is not the engine alone that defines the character and driving characteristics of a super sports car. Another key element is the transmission. The demands are clear - the ratios must be perfectly arrayed and enable optimum power delivery from the engine. For maximum vehicle performance, shift times should be less than the blink of an eye. Operation must be clear and straightforward, via two ergonomic shift paddles behind the steering wheel. The characteristics of the transmission must be in line with the wishes of the driver at any given point - from smooth city cruising through to tough action on the racetrack. And, not least, Lamborghini customers expect an emotional shift feeling that ensures the sports car's reactions can always be felt and understood. Thus, the development objective was clearly formulated in this respect, too - create the world's most emotional gear shift.
For all these reasons, the engineers in the R&D Department opted for a robotized gearbox as the "companion" of the new V12 power unit - however, in a very special iteration: the Lamborghini ISR transmission. This robotized gearbox combines extremely fast shift times, almost 50% less than dual-clutch transmission with the benefits of a manual transmission in terms of weight and compact dimensions - both always critical for super sports cars
Unique engineering for supersportscars
The new unit is laid out as a two-shaft transmission with seven forward gears and one reverse. For especially high durability, the synchronizing rings are made from carbon-fiber - a material with which Lamborghini has enormous experience. The short shift times are facilitated by the special design of the transmission, known as ISR - Independent Shifting Rod.
To summarize the principle - in a conventional manual gearbox, be it automated or fully manual, the gear wheels for, say, second and third gears are located side by side. When the driver wants to shift gear, the shifting sleeve with synchronizer unit is moved along the shifting rod from second gear through neutral to third gear. This requires twice the distance and twice the time - second gear has to be disengaged before third gear can be engaged.
Short distances, fast shift times
This process is significantly shortened in the Lamborghini ISR transmission - the gear wheels from the second and third gears are separate from each other and the shifting sleeves are actuated by independent shifting rods. Now the shifting process can run virtually in parallel - while one shifting rod is disengaging one gear, the second shifting rod can already engage the next gear. Because these movements partially overlap and the mechanical distances are considerably shorter, this facilitates a significant saving in shift time. Overall, the Lamborghini ISR transmission shifts around 40 percent faster than the e.gear transmission in the Gallardo. And that is already one of the world's fastest automated manual gearboxes.
Compact construction, low weight
The new transmission has four of these independent shifting rods, with sensors constantly monitoring their exact positions. They are operated via hydraulic actuators, with an extremely high system pressure of 60 bar ensuring the necessary operating speed. The system incorporates a total of seven hydraulic valves, with pressure supplied by an electric pump. The double-plate clutch is also hydraulically actuated. All system components are contained within one casing. The total weight of the transmission is only 70 kilograms - a distinct advantage, especially compared with the significantly heavier dual-clutch transmissions from the same category
Three operating modes for all situations
Lamborghini drivers can choose between three operating modes - the Strada mode offers highly comfort-oriented shifting, with fully-automatic also an option. The Sport mode has a dynamic set-up in terms of shifting points and times, while the Corsa mode delivers the maximum shift strategy for race track driving. This mode also includes Launch Control, the automatic function for maximum acceleration from a standing start.
With the Lamborghini ISR transmission, engineers working under the sign of the bull have devised an ingenious mate for the new twelve-cylinder power unit. Their work has created an overall powertrain that is absolutely unique in the world of super sports cars.
Integrated electronic control system
The excellent performances are possible only by a fast communication architecture through the several powertrain ECU's and considering the powertrain as ONE-system (un unico sistema) in the car.
The fully electronic controlled coupling device for the front wheels (the ‘old' viscous coupling) is another key point of the powertrain: it is able to continuously distribute the right torque to the front wheels for always attaining the best performance aspired to by the driver. The torque distribution to the front wheels can vary continuously from 0% to 60% of the total torque available.
Money and time weren't the main reason why, it wasn't made because of few reasons - first of all they are sure at Lamborghini that this new gearbox will be better and lighter in one package. Second thing - probably they want to give some space for further development of the car. According to what I was told G-successor which will be cheaper of course will have DCT and will share it with next generation of R8.
Actually its hard to compare gearboxes without having really enjoyed various sportscars with DCT and automated manual. DCT has many advantages of course, but really lacks emotions. I have some real life exprerience here and I am saying this absolutely serious.
Pagani will follow the same road and use rather similar gearbox in C9, but from different maker. Similar ISR gearbox made also by Graziano which is used in LP700-4 probably will be used in another very interesting italian halo car, so it hardly be described as a poor choice, just wait and see how it performs
Press release on the gearbox:
The new Lamborghini ISR transmission (ISR: Independent Shifting Rods) - Innovative servo-actuated mechanical gearbox for maximum performance
However, it is not the engine alone that defines the character and driving characteristics of a super sports car. Another key element is the transmission. The demands are clear - the ratios must be perfectly arrayed and enable optimum power delivery from the engine. For maximum vehicle performance, shift times should be less than the blink of an eye. Operation must be clear and straightforward, via two ergonomic shift paddles behind the steering wheel. The characteristics of the transmission must be in line with the wishes of the driver at any given point - from smooth city cruising through to tough action on the racetrack. And, not least, Lamborghini customers expect an emotional shift feeling that ensures the sports car's reactions can always be felt and understood. Thus, the development objective was clearly formulated in this respect, too - create the world's most emotional gear shift.
For all these reasons, the engineers in the R&D Department opted for a robotized gearbox as the "companion" of the new V12 power unit - however, in a very special iteration: the Lamborghini ISR transmission. This robotized gearbox combines extremely fast shift times, almost 50% less than dual-clutch transmission with the benefits of a manual transmission in terms of weight and compact dimensions - both always critical for super sports cars
Unique engineering for supersportscars
The new unit is laid out as a two-shaft transmission with seven forward gears and one reverse. For especially high durability, the synchronizing rings are made from carbon-fiber - a material with which Lamborghini has enormous experience. The short shift times are facilitated by the special design of the transmission, known as ISR - Independent Shifting Rod.
To summarize the principle - in a conventional manual gearbox, be it automated or fully manual, the gear wheels for, say, second and third gears are located side by side. When the driver wants to shift gear, the shifting sleeve with synchronizer unit is moved along the shifting rod from second gear through neutral to third gear. This requires twice the distance and twice the time - second gear has to be disengaged before third gear can be engaged.
Short distances, fast shift times
This process is significantly shortened in the Lamborghini ISR transmission - the gear wheels from the second and third gears are separate from each other and the shifting sleeves are actuated by independent shifting rods. Now the shifting process can run virtually in parallel - while one shifting rod is disengaging one gear, the second shifting rod can already engage the next gear. Because these movements partially overlap and the mechanical distances are considerably shorter, this facilitates a significant saving in shift time. Overall, the Lamborghini ISR transmission shifts around 40 percent faster than the e.gear transmission in the Gallardo. And that is already one of the world's fastest automated manual gearboxes.
Compact construction, low weight
The new transmission has four of these independent shifting rods, with sensors constantly monitoring their exact positions. They are operated via hydraulic actuators, with an extremely high system pressure of 60 bar ensuring the necessary operating speed. The system incorporates a total of seven hydraulic valves, with pressure supplied by an electric pump. The double-plate clutch is also hydraulically actuated. All system components are contained within one casing. The total weight of the transmission is only 70 kilograms - a distinct advantage, especially compared with the significantly heavier dual-clutch transmissions from the same category
Three operating modes for all situations
Lamborghini drivers can choose between three operating modes - the Strada mode offers highly comfort-oriented shifting, with fully-automatic also an option. The Sport mode has a dynamic set-up in terms of shifting points and times, while the Corsa mode delivers the maximum shift strategy for race track driving. This mode also includes Launch Control, the automatic function for maximum acceleration from a standing start.
With the Lamborghini ISR transmission, engineers working under the sign of the bull have devised an ingenious mate for the new twelve-cylinder power unit. Their work has created an overall powertrain that is absolutely unique in the world of super sports cars.
Integrated electronic control system
The excellent performances are possible only by a fast communication architecture through the several powertrain ECU's and considering the powertrain as ONE-system (un unico sistema) in the car.
The fully electronic controlled coupling device for the front wheels (the ‘old' viscous coupling) is another key point of the powertrain: it is able to continuously distribute the right torque to the front wheels for always attaining the best performance aspired to by the driver. The torque distribution to the front wheels can vary continuously from 0% to 60% of the total torque available.
#29
11-18-2010, 11:40 AM
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