A milestone in the history of Lamborghini: The new twelve-cylinder and the new ISR tr
Nov 15, 2010 | 07:52 PM
#18
Teamspeed Pro
Joined: Sep 2008
Posts: 2,667
From: Nashville, TN
This innovative manual gearbox combines extremely fast shift times – almost 50 percent shorter than with a dual-clutch transmission – with the benefits of manual shifting when it comes to low weight and compact dimensions, both always crucial for a super sports car. The low shift times are enabled through the transmission’s particular design, known as ISR (Independent Shifting Rod). Instead of taking place in series, as with a conventional gearbox, shifting can occur virtually in parallel. While one shifting rod is moving out of one gear, the second shifting rod can already engage the next. Moreover, the transmission weighs only 79 kilograms – a distinct benefit, even against comparable DSG transmissions, which are considerably heavier.
I call bullshit on all of the above.
I call bullshit on all of the above.
Nov 15, 2010 | 08:29 PM
#20
Teamspeed Pro
Joined: Jan 2008
Posts: 2,691
I want to see a technical breakdown of how the ISR system works.
To me, it sounds like the "pre-selector" gearboxes from a long time ago, but with the electronics controlling which gear the transmission summons. From the pictures, it appears there are two rods. One for 1,3, 5 and 7 if it's a 7-speed and then another for 2, 4 and 6. So when you hit the paddle at the top of 2nd for instance, 3rd has already been selected by the opposite rod, with the clutch only acting as the intermediary between the two. The calibration of the rods is the only thing I can't figure out. The software will be controlling them, but how exactly they are setup and the torque acting upon them all needs to work perfectly if it's going to pull off the advertised shift times.
I doubt they will be rebuildable. If something goes wrong, the dealer will probably pull the broken one out and replace with a new box. Similar to what Porsche was doing with the 996 engines.
Another interesting thing is that the engine still has throttlebodies, which is a bit old school. I would have thought they would have had the cams controlling the throttle like the new BMW engines. The video also clearly shows that the cylinder heads only have one hole in the center for the spark plug, so no direct fuel injection.
To me, it sounds like the "pre-selector" gearboxes from a long time ago, but with the electronics controlling which gear the transmission summons. From the pictures, it appears there are two rods. One for 1,3, 5 and 7 if it's a 7-speed and then another for 2, 4 and 6. So when you hit the paddle at the top of 2nd for instance, 3rd has already been selected by the opposite rod, with the clutch only acting as the intermediary between the two. The calibration of the rods is the only thing I can't figure out. The software will be controlling them, but how exactly they are setup and the torque acting upon them all needs to work perfectly if it's going to pull off the advertised shift times.
I doubt they will be rebuildable. If something goes wrong, the dealer will probably pull the broken one out and replace with a new box. Similar to what Porsche was doing with the 996 engines.
Another interesting thing is that the engine still has throttlebodies, which is a bit old school. I would have thought they would have had the cams controlling the throttle like the new BMW engines. The video also clearly shows that the cylinder heads only have one hole in the center for the spark plug, so no direct fuel injection.