|02-21-2014 10:09 AM|
|02-21-2014 08:43 AM|
|02-19-2014 03:32 PM|
I have said it a thousand times......the issue for dry dual clutch transmissions is thermal.
VW's horror story on their dry dual clutch should have been a red flag for Ford , but I guess the low cost associated with manufacturing the dry dual clutch clouded their better judgement.
I predict a similar fallout for Ford as what happened to VW (extended warranty). will be in the future when thousands of out of warranty dry dual clutch owners have to dig deep into the bank account to keep their dry dual clutch operating in a respectable fashion.
That said, my Powershift dry dual clutch in the 2012 Focus wagon has been a real peach. But I believe the set up is quite different between North America and Europe, because of the emission requirements being different and other considerations.
Also I believe different driving conditions for each owner will result in how this transmission operates.
If you do lots of stop and go, you will experience the dry dual clutch at its worse.
Lots of highway and very little stop and go or mountain roads, then it works as advertised.
I suggest Ford get out of the dry dual clutch arena, and not get buried in a storm like VW is facing around the world, minus the North American market.
|02-19-2014 02:28 PM|
If my car weren't a lease and I wasn't trading up at the end of the year, I'd probably be raising hell at my dealer about the transmission; it seems to have gotten noticeably worse this winter in terms of shuddering and looooooong shift times (and once the selectshift just said "nope" when I tried shifting from first to second and I lost "sport" mode until the car was restarted).
It's just kind of sad that my relatively new car with 13,000 miles shifts like my old V8 SHO that had 130,000.
And in case it hasn't been posted in this thread, pictures of a clutch/seal replacement:
|02-19-2014 02:17 PM|
And that is the second reputable article I've seen that mentions 'virtual testing'. The other --> http://social.ford.com/our-articles/cars/fiesta/inside-info-on-the-ford-powershift-six-speed-automatic-transmission/
I haven't come across one that mentions any real world vehicle testing. Though I'm sure there has to be one somewhere?
If not, then it's quite clear the computer nerds didn't get the testing strategies correct.
I knew nothing of how this DCT worked and this thread forced me to learn and read.
The conclusion I came to is more questions and theory than anything.
I wonder how many of the concerns come from owners who've never driven a manual transmission?
The one thing that, from the problem threads I'd read and possible solutions, I've found is that the problem all seems to stem from clutch temperature.
I'm not sure if any of you have ever overheated a clutch. But I can tell you the functionality of it changes greatly. If bad enough it can get to the point of the car not moving at all. Less severe, chatter beyond belief. But in my experience it took a lot of abuse to get to that point.
It's very similar to 'brake fade'. Both are friction materials and both are designed to create heat and mitigate it.
Now I would say some may have to do with driving style. In the case of someone who's never driven a manual transmission, they may try to operate it at too low of RPM and the clutches generate too much heat, or heat faster than the spinning of the clutch pack can move air around to cool itself. ... Because in most threads I've found, most say at highway speeds they have little to no problems. So heat and air flow seem to be the best theory IMO.
The question then becomes how to remedy that problem.
The simple solution would be more RPM. How much would be trial and error but you at least have some basis to go by, road speed RPM.
Another alternative may be a breather or venting of the clutches, or active cooling.
Reliability and repeatability concerns come into play from an open bellhousing. Road debris can contaminate the clutch/es and cause concerns. But what if the clutch was able to draw clean air? Then the debris and contamination factor is lowered, possibly eliminated. That would sound like a feasible option/remedy to me. But applying it to existing vehicles would be cumbersome and expensive.
Now the question I haven't seen posed is "what changes are contained in these strategy updates/revisions?"
I feel that if one of us knew that we'd have a better understanding of what is going wrong.
But reading the good articles should shed light on what the updates are doing. The SAE article mentions that there are no heat sensors in the trans and that it is all done by math, fancy math. So knowing that and keeping with my theory of heat, I'd say it's a good bet that the updates are simply modifying the critical temps of the clutches.
But with no way to actually measure temps it's always going to be trial and error. Always!
So that says someone needs to devise a way to physically measure the temp of the clutches. Problem there is the sensor would have to be a no contact one and survive in the dirty environment of clutch dust. But hold on. I brought up 'active cooling' and filtered air. If both of those were combined the air inside the trans wouldn't be some contaminated and the sensor would have less chance of getting dirty and providing false data.
There are my thoughts. In any new version I would expect to see an actual temp sensor and possibly some type of filtered cooling air system. I feel that having both would reduce most issues if not all.
|02-19-2014 12:22 PM|
|02-19-2014 10:13 AM|
When you try to develop new vehicles, there will always be some bumps. Some of them are minor, some of them are not. (the pinto, the Expolorer/Firestone disaster, and the toyota unintended acceleration recall all come to mind.) Although it is frustrating for those dealing with the issue, the DCT is no where near that level of failure.
You can be pissed off at Ford. Trust me, I am about the SPI. But you can't assume any other manufacturer would act any differently. You can point out other manufacturers who acted differently, but each problem is different, hence, each solution (or lack there of) is different. And we, as consumers, simply do not have enough information to judge. With our limited information, assuming that company A responds better to customer complaints than company B is simply not possible.
At the end of the day, all we can say is, I wish Ford would handle this differently. We can't say, Chrysler, Honda, Chevy, Toyota, etc. would handle this situation differently. It all boils down to numbers, and if this were any other manufacturer, the numbers would not be any different.
|02-18-2014 07:55 PM|
My personal opinion: clutches are best when operated by a left foot, not a computer.
"Ford started with a simulator program in which "civilian" Ford employees tested a wide range of control strategies."
And many people do not know that some of the shudder is by design:
"the computer can induce some shift shudder " (as a warning)
|02-18-2014 06:56 PM|
You could suffer the fate of the folks that go to pass with their manual transmission and experience a chilling lack of power...
Don't worry. It won't happen to you... but it could
|02-18-2014 06:03 PM|
Let's try this: compared to other similar situations and similar automakers (even including Ford), on a scale of 1 - 5, with 5 being best how would you rate the Focus DCT situation in terms of:
a) Releasing a good-quality product to the public, demonstrating both thorough pre-production testing and a willingness to hold back production if standards weren't met (like Chrysler just did with the Jeep Cherokee's transmission). Keeping in mind that it took the automotive press all of, say, 10 minutes in a DCT Focus to highlight the problem and that Ford has tons of DCT experience in Europe.
b) Promptly and efficiently dealing with problems when they become evident. Keeping in mind that Ford has spent three calendar years on this issue so far, and only called in the "A" team a year ago. Maybe it's fixed, but maybe not quite. Three years.
I give Ford a "1" in both categories. You may grade higher, but certainly not more than a "2".
This has less to do with corporate morality than it does corporate competence. Maybe the Focus experience was a low point for Ford, maybe they've learned a thing or two, maybe future launches will be better. But as a Focus owner, none of that mitigates my frustration and disappointment with Ford.
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