We all know about the issues with the dry clutch DSG gearbox. Every 20k km they need to be replaced because of juddering / shuddering issues. But the common explanations never made much sense to me:
1. Worn clutch plate
Why does the juddering only happen on low RPM then? It doesn't feel like a slipping clutch, which should result in an RPM spike but no acceleration. Instead there is hesitation and judder.
2. Overheating clutch
The explanation goes like this: since there's no oil to cool the clutches, they overheat and start slipping (similar to brake fade effect). DSG6 has a wet clutch and doesn't overheat like that. This does make some sense, because DSG7 performs better when cold. But it doesn't explain why the clutch doesn't slip in S mode? It should slip even more.
3. Oil contamination
The seal around the shaft lets through a bit of oil from the gearbox part of the DSG7. That causes the clutches to slip until the oil dries away.
4. Dirt contamination
The clutch pack allows road dirt to fly in and that causes the judder. You need to drive it hard to clear the dirt.
5. Software problem
Wrong shift points vs clutch pressure vs RPM. Why wouldn't they have fixed it by now?
6. Clutches bent out of shape
Too much pressure causes clutch deformation, too little pressure causes slippage and there's no better middle ground than what we already have. There's no way around the judder. But why wouldn't they upgrade the clutch pack then?
7. The most in-depth explanation can be found here:
https://touran.me/media/2013/03/DQ200issue_en.pdf" onclick="window.open(this.href);return false;
Essentially, under very specific circumstances BOTH clutches can momentarily be slightly engaged at the same time. In a dual clutch gearbox this results in friction fighting between the clutches as one is connected to a different gear than the other. This explanation matches my experience. But it also means that the clutch pack, although it may be defective in design, is still good (not worn).
Has anyone found a better explanation?