Cvx or active drive8

[oil barron]

Doesn't seem like it...
Actually the video does show that they work like I assumed except rather than shifting the unused shaft into neutral it remains in the gear it was last in right up until the moment you change to a different gear.
IE when shifting to 3rd gear the other shaft keeps 2nd engaged all the way until you actually tell it to shift into 4th and only then does the fork move.

So no, the synchros don't have to work any more in this type of DCT...

If you watch the kick down part of the video you will see both forks move. It will depend obviously what the load is whether it stays in 2nd or goes to 4th. But it doesn’t go to a neutral like you said earlier

 

[Frankzy]

If you watch the kick down part of the video you will see both forks move. It will depend obviously what the load is whether it stays in 2nd or goes to 4th. But it doesn’t go to a neutral like you said earlier

I never said that it did only that I would have assumed they did. And actually on second viewing they do exactly like I first assumed and they move the rings into neutral as soon as you shift to the other shaft.
Look at the sequence starting at ~3:05 where several rings move twice in the same direction meaning the first time was into neutral.

 

[oil barron]

I never said that it did only that I would have assumed they did. And actually on second viewing they do exactly like I first assumed and they move the rings into neutral as soon as you shift to the other shaft.
Look at the sequence starting at ~3:05 where several rings move twice in the same direction meaning the first time was into neutral.

There are two selectors on each shaft. One for 2 and 4 and one for 6 and 8. So in the sequence the guy is tapping down from 6 to 5 so one selector goes to neutral and one goes to 4 in prep for a further downshift. He then goes up a gear so it has to go back into 6. There is always a gear engaged on each shaft as the actual change is made by the powershift clutch changing from one shaft to another so it has to be ready for that to happen. That is the hole benefit of a DCT so that the shift happens immediately and smoothly. Which gear is selected on the shaft not driving could change 100 times depending on the load before an actual shift is made. So the synchros and the selectors very much have to do a lot of work. Not to mention this is also you regular gear steps, not the range steps that would be being made in the synchro selector for range command or Dyna 6. So when you take all that into consideration these synchros and selectors do a lot of work. Whether they are designed for that extra work only time will tell.

 

[Frankzy]

There is always a gear engaged on each shaft as the actual change is made by the powershift clutch changing from one shaft to another so it has to be ready for that to happen.

Except no, there isn't...
Look again at the video, at the start of the 3:05 sequence the top shaft is transmitting power via the second selector ring and then the clutch disconnects the shaft and the second ring is moved into neutral. While this happens the first selector ring stays in neutral, and it along with the second ring stays in neutral right up to a few moments before the clutch starts to engage the top shaft again.

This means that this gearbox does not use the synchros unless you are actually changing gear, just like any other manual gearbox.

 

[daveydiesel1]

If your doing any amount of roadwork with trailers then Active8 I have a Blue one and no whine from my transmission. I believe if you have GSM unlocked she will behave like an auto command within a certain range.

There are two selectors on each shaft. One for 2 and 4 and one for 6 and 8. So in the sequence the guy is tapping down from 6 to 5 so one selector goes to neutral and one goes to 4 in prep for a further downshift. He then goes up a gear so it has to go back into 6. There is always a gear engaged on each shaft as the actual change is made by the powershift clutch changing from one shaft to another so it has to be ready for that to happen. That is the hole benefit of a DCT so that the shift happens immediately and smoothly. Which gear is selected on the shaft not driving could change 100 times depending on the load before an actual shift is made. So the synchros and the selectors very much have to do a lot of work. Not to mention this is also you regular gear steps, not the range steps that would be being made in the synchro selector for range command or Dyna 6. So when you take all that into consideration these synchros and selectors do a lot of work. Whether they are designed for that extra work only time will tell.

What if its driven in manual mode does it still shift up and down predicting the next change

 

[oil barron]

What if its driven in manual mode does it still shift up and down predicting the next change

Yes. Think about how slow a range change is in range command or dyna 6. There is no way you could have that for you main powershift steps. The gear has to be engaged before you want to make the change so that when you do change all you are doing is swapping powershift clutches.

 

[oil barron]

Except no, there isn't...
Look again at the video, at the start of the 3:05 sequence the top shaft is transmitting power via the second selector ring and then the clutch disconnects the shaft and the second ring is moved into neutral. While this happens the first selector ring stays in neutral, and it along with the second ring stays in neutral right up to a few moments before the clutch starts to engage the top shaft again.

This means that this gearbox does not use the synchros unless you are actually changing gear, just like any other manual gearbox.

I see what you mean about the video, but I’m sorry that’s not how DCTs work. They have to anticipate the next change and have it selected before it is. Here is a better video for you bud

 

[Fragonard]

Tnx for all the answers. So a cvx would be my safest bet. Whats the cvx life span in comparison to fendt vario or JD autopower. Is it more about the driver or workload or brand??

Did you decide?

 

[lux99slovenia]

Did you decide?

Its going to be cvx. But still waiting if some CAP money would be available for us hilly farmers. If not I would have to go second hand (up to 2500 hours).