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SUVs Ford Freestyle Ford Freestyle CVT Transmissions
203 messages, Last post on Oct 23, 2009 at 6:23 PM
You are in the Ford Freestyle Forum. Your Hosts are steve_ & tidester
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A physicist says the glass is neither. It is completely full, half with water, the other half with air. An analyst says it is neither, it simply contains 50% of its potential capacity. A realist says it doesan't matter. It's just gonna have to be washed later anyways. A mathematician cannot decide since the glass can never be EXACTLY half full or half empty (except in the limit). To the politician, somebody has taken half the contents of the glass, and something must be done about it! |
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Replying to: barnstormer64 (May 04, 2008 11:06 am) |
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Replying to: barnstormer64 (May 04, 2008 11:06 am) A mathematician would say it's topologically equivalent to a Ford Freestyle and try to drive off with it like we did with this topic!  tidester, host SUVs and Smart Shopper
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Replying to: tidester (May 04, 2008 11:51 pm) You know, we went through this last year when Edmunds decided to break up forums into different topics instead of letting people determine where they wanted to post. There were fewer topics, but a bit more of a story line. I point this out because you moved my "I prefer Freestyle over T-Rex" post from the Taurus-X forum to this one - but the post was really about the T-Rex, not CVT. Can we copy this message back to the Freestyle / T-Rex forum? Not only that, but I note that the hosts keep having to tell people to post in an existing forum, which is a bit ironic when you think about it - we went from a very few forums to many, many forums, of which quite a number have 2 messages - the original and the host reply to post in a different forum.
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Replying to: stevedebi (May 05, 2008 8:43 am) tidester, host SUVs and Smart Shopper |
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2006 FS-just over 38,000 miles, just out of warranty, i start to hear weird noises out of the engine, like a belt is loose. Then it starts roughly, runs roughly, especially in cold weather. It also had acceleration problems, not accelerating like it did originally. Sometimes had a pause and then kick with power. Further, when i put it in reverse, it had a disturbing acceleration, which could be very dangerous. Sort of lurched backward with too much power for just taking my foot off the break. It has now been in the dealer 2 times, for a total of 4 weeks. They have told me it is one issue and then another. They replaced the engine sensor light twice, check the PCM, the wiring and the coils. They alternate between telling me it is my problem for not changing the oil soon enough (went 14,000 miles before change) to telling me it is a computer problem or some other part. Now they are telling me it is a timing chain issue that will cost me $1600 or if that doesn't fix it, the whole engine needs to be replaced for a cost of $6800! This car is not that old, doesn't have that many miles on it. Is this just another transmission failure issue, like others I have read? Suggestions? I have liked the car, but I cannot afford to put in a whole new engine in it, especially if this is a design defect. 
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I've been trying to find out the sensitivity of fuel economy to CVT chain tension (clamping force on the cones). Specifically, is this tension/force just set, or is it somehow automatically adjusted? I don't see how this force is directly sensed, so is a certain hydraulic pressure simply commanded, with hope that the force/tension turns out right? In a nutshell, what is the control law/strategy for chain tension and clamping force against the cones? Any maintenance required? Below, a quote and link from ZF's Mini Cooper version of our CVT. I understand ours is very similar, ours having a torque convertor for smoother takeoffs from a standstill, and different control software of some kind. I posted this in the Freestyle maintenance section in hopes of snagging an answer from fordwrench or somebody else that understands the internals of this. I communicated this question to the son of the engineer who led the original development for the basic ZF design, and he is asking his dad about this. I'll post his answer later should I get it and compare it with the brainiacs who might answer this here. I'm certainly going to learn something here, and hope you all will too. From the Mini Cooper CVT transmission article PDF file to download here..., page 21 "Pressure is supplied to the secondary pulley to ensure that there is always adequate clamping force onto the belt for all load conditions. A solenoid valve influences the secondary pressure control valve, optimising the pressure and hence the clamping force. Optimisation of this pressure improves fuel consumption. The working valves in this area are the secondary valve, the exhaust secondary valve, and a PWM solenoid secondary valve."
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Replying to: coldcranker (Jun 19, 2008 6:12 pm) Also see Technical CVT Paperor another Set of CVT Tech Papers. A lot of engineering/tech reading; not easy to understand. Anyway, I'll try to run Okahara's comments past one of the engineers responsible for the ZF CVT in our Freestyles to see if he thinks clamping force variations across many Freestyles could be a problem. |
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The Taurus X does not use a CVT, and the forum should either be "Ford CVT", "Freestyle CVT", or just "CVT Transmissions".
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Replying to: ct2ct (May 06, 2008 9:38 pm)
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