cvt new techonology??? :S

It could be a lot of things, but not "new". I was talking with the dealer service manager, and he told me that the cvt is a very good tranny. 0 problems here.

exists some details with this tranny, obviously is different as you drive a manual vs auto, you can feel some "jerk" in cold when you start driving, but is a good tranny.

 

Used 07 Patriot 4WD w/CVT



I purchased a used Patriot w/less than 35k miles a couple months ago; have been viewing this forum before and since the purchase so I've learned a great deal and appreciate the comments! I'm getting acceptable gas mileage averaging 25mph which is one of my reasons for buying it. The other is the 4WD and that will be tested in the winter months.

--I've begun to notice when the vehicle is cold that 'downshifting' is rough. I wouldn't say that it stalls, but definitely demonstrates a 'lag' around 20-25 mph. When the engine warms up, it is not as noticeable--just hesitating as it slows down; becomes kind of jerky momentarily. My first impulse is to 'help it along' by slowly decelerating engine rpm, rather than leaving my foot on the gas & coasting and that helps.

Now my question about the CVT--is that uneven deceleration 'normal'? As I approach the cold winter months, will this be more & more of an issue??

Appreciate any comments especially from those who drive in colder climates.

 

The vast, non-vocal majority will say yes trust the CVT. The few people who either don't like the different power curve, or have had problems will rant about how awful it is. I like it. Aggressive drivers generally do not.

On the modification side though, Jeeps do just cry out to be personalized. Loudly at times!

 

Bingo ...

I wasn't sure what to expect from the CVT on mine, but you nailed it. It's not too pleasant if you drive real aggressively. It feels like it's not programmed for that driving style and will "resist" your attempts to drive it that way.

But otherwise, I like mine. I notice it acts a little more like a manual in the respect that if I stop on an incline, it will actually roll backwards if I let off the brake. I also agree with a description I read once about it, where the driver was explaining how you sort have to estimate the amount of speed you want to build up in advance. You really don't hold down the pedal a certain amount to maintain a given speed, so much as you press it down briefly to build up a certain amount of acceleration, and then let it kind of coast from there.

It's a little bit odd looking at the tach and seeing how low it reads vs. the speed you're traveling, at times, too.

 

Not saying I dont like the tranny but I am saying it hasnt been on the market for that long and I am one who likes peace of mind by having a warranty...my garage guy also has said nothing but great things about the tranny...im just a skeptic with something that is different ....I also put a cold air intake which I am loving...almost sounds like a diesel jeep now.

 

the cvt tranny is anything but NEW, Nissan has been using it for years with very little problems. the company who builds them for Nissan and Jeep is Jatco.

 

Let me rephrase everthing...The only reason I said what I said is because as you see by posts of this website and others there strange cases of the tranny failing before the car is close to high mileage....I just get paranoid when it involves thousands of dollars....I love my jeep and will defend it against anything.

 

I love my Patriot, including the CVT. Cvt is old technology, in the 70's the Sport Club Car of America use them in their race cars. Hey, they where even banned from use in F1 race cars because the CVT make the cars to fast, and that was in 1994!!
I mean, our Patriots are not race cars, and those CVT's are completely different, but so far I can't complaint from the feel of the CVT. It works for me.

 

I just wanted to say I do not trust the cvt...I just bought a 2010 patriot and made the leap of buying the 2010 new floor model cause I wanted the 100,000 mile warranty...I was test driving a used 2007 limited and did some serious thinking and said why not pay a little extra for new and the peace of mind that if this new cvt technology fails, Im covered. Im not downing jeep, Im just commenting that if anyone is on the fence to get new or used get new..it may cost more but its the long term safe thing to do. I am loving my jeep...I am not quite in my middle 20's and this is my third jeep by choice, not cause something happened to it...every one I have had has been very reliable. The only problem is I cant stop spending money on the add ons...ive already put off road lights on the bumper, a nice heavy duty liner in the back, and just ordered today a Black Bull Bar Grille Guard Push and I cant wait till it comes in, this will set my jeep from the rest because this exact product hasn't been around very long...if you are looking to put that on your jeep just type those exact words on ebay and there it is...you can get even a better price if you call them and order instead of ordering it through ebay. Next is the rro lift

well I should congratulate by that and we are looking forward to the rro lift it must be good then

 

CVT failure has been discussed on here before and you can put some of your fear to rest as they have a very low failure rate. Of the 7000+ members on this forum, there have only been about 10 or so reported failures. That's less then a 1% failure rate (70 reported failures would be 1%). The cost to replace the whole transmission is about the same as any automatic. The difference is traditional automatics can sometimes be repaired for less then full replacement cost, but if you were replacing the whole unit, the cost is about the same.

The Subaru Justy was one of the first cars sold in the States with a CVT, back in 1989 so they've been around in the States for more then 21 years!

From: http://en.wikipedia.org/wiki/Continuously_variable_transmission

History

Leonardo da Vinci, in 1490, conceptualized a stepless continuously variable transmission.[5] The first patent for a friction-based belt CVT was filed in Europe[clarification needed] by Daimler and Benz in 1886, and a US Patent for a toroidal CVT was granted in 1935.[6] [7]

In 1910 Zenith Motorcycles built a V2-Motorcycle with the Gradua-Gear which was a CVT. This Zenith-Gradua was so successful in hillclimb events, that it was eventually barred, so that other manufacturers had a chance to win.

1912 the British motorcycle manufacturer Rudge-Whitworth built the Rudge Multigear. The Multi was a much improved version of Zenith's Gradua-Gear. The Rudge Multi was so successful that CVT-gears were eventually barred at the famous Tourist Trophy race (which was the world's most important motorcycle race before World War I) from 1913 on.

In 1922 Browne offered a motorcycle with variable-stroke ratchet drive using a face ratchet.[8]

An early application of CVT was in the British Clyno car, introduced in 1923.

A CVT, called Variomatic, was designed and built by Hub van Doorne, co-founder of Van Doorne's Automobiel Fabriek (DAF), in the late 1950s, specifically to produce an automatic transmission for a small, affordable car. The first DAF car using van Doorne's CVT, the DAF 600,was produced in 1958.[9] Van Doorne's patents were later transferred to a company called VDT (Van Doorne Transmissie B.V.) when the passenger car division was sold to Volvo; its CVT was used in the Volvo 340.

Many snowmobiles use a rubber belt CVT.
In 1974, Rokon offered a motorcycle with a rubber belt CVT.
CVTs are used in some ATVs. The first ATV equipped with CVT was Suzuki's LT80 mini in 1987.

In early 1987, Subaru launched the Justy in Tokyo with an electronically controlled continuously variable transmission (ECVT) developed by Fuji Heavy Industries, which owns Subaru. In 1989 the Justy became the first production car in the U.S. to offer CVT technology. While the Justy saw only limited success, Subaru continues to use CVT in its kei cars to this day, while also supplying it to other manufacturers.[10]

In the summer of 1987 the Ford Fiesta and Fiat Uno became the first mainstream European cars to be equipped with steel-belted CVT (as opposed to the less robust rubber-belted DAF design). This CVT, the Ford CTX was developed by Ford, Van Doorne, and Fiat, with work on the transmission starting in 1976.[10]

The 1992 Nissan March contained Nissan's N-CVT based on the Fuji Heavy Industries ECVT.[10] In the late 1990s, Nissan designed its own CVT that allowed for higher torque and included a torque converter. This gearbox was used in a number of Japanese-market models. Nissan is also the only car maker to bring roller-based CVT to the market in recent years. Their toroidal CVT, named the Extroid, was available in the Japanese market Y34 Nissan Gloria and V35 Skyline GT-8. However, the gearbox was not carried over when the Cedric/Gloria was replaced by the Nissan Fuga in 2004.
The Nissan Murano, introduced in 2003, and the Nissan Rogue, introduced in 2007, also use CVT in their automatic transmission models. In a Nissan Press Release, July 12, 2006 Nissan announced a huge shift to CVT transmissions when they selected their XTronic CVT technology [11] for all automatic versions of the Nissan Versa, Nissan Cube, Nissan Sentra, Nissan Altima and Nissan Maxima vehicles in North America, making the CVT a truly mainstream transmission system. One major motivator for Nissan to make a switch to CVTs is as part of their 'Green Program 2010' aimed at reducing CO2 emissions by 2010.
To date Nissan has had the most success with producing their CVTs in high volume and on a wide range of vehicles. The CVT found in Nissan's Maxima, Murano and the V6 version of Altima is considered to be the worlds first "3.5L class" belt CVT, it is able to hold much higher torque loads then other belt CVTs developed by other automakers. [12]
After studying pulley-based CVT for years, Honda also introduced their own version on the 1995 Honda Civic VTi. Dubbed Honda Multi Matic, this CVT gearbox accepted higher torque than traditional pulley CVTs, and also includes a torque converter for "creep" action. The CVT is also currently employed in the Honda City ZX that is manufactured in India and Honda City Vario manufactured in Pakistan.
Toyota used a Power Split Transmission (PST) in the 1997 Prius, and all subsequent Toyota and Lexus hybrids sold internationally continue to use the system (marketed under the Hybrid Synergy Drive name). The HSD is also referred to as an Electronically-controlled Continuously-variable Transmission.
The PST allows either the electric motor or the internal combustion engine (ICE) or both to propel the vehicle. In ICE-only mode, part of the engine's power is mechanically coupled to the drivetrain, with the other part going through a generator and a motor. The amount of power being channeled through the electrical path determine the effective gear ratio. Toyota also offers a non-hybrid CVT called Multidrive for models such as Avensis.

Audi has, since 2000, offered a chain-type CVT (Multitronic) as an option on some of its larger-engine models, for example the A4 3.0 L V6.
Fiat in 2000 offered a Cone-type CVT as an option on its hit model Fiat Punto (16v 80 PS ELX,Sporting).

BMW used a belt-drive CVT as an option for the low- and middle-range MINI in 2001, forsaking it only on the supercharged version of the car where the increased torque levels demanded a conventional automatic gearbox. The CVT could also be manually "shifted" if desired with software-simulated shift points.
GM introduced its version of CVT known as VTi in 2002. It was used in the Saturn Vue and Saturn Ion models. This transmission was quickly withdrawn in 2005 models due to high failure rates.[citation needed]

Ford introduced a chain-driven CVT known as the CFT30 in their 2005 Ford Freestyle, Ford Five Hundred and Mercury Montego. The transmission was designed in cooperation with German automotive supplier ZF Friedrichshafen and was produced in Batavia, Ohio at Batavia Transmissions LLC (a subsidiary of Ford Motor Company) until March 22, 2007. The Batavia plant also produced the belt-driven CFT23 CVT which went in the Ford Focus C-MAX. Ford also sold Escort and Orion models in Europe with CVTs in the 1980s and 1990s.

Contract agreements were established in 2006 between MTD Products and Torotrak for the first full toroidal system to be manufactured for outdoor power equipment such as jet skis, ski-mobiles and ride-on mowers.[13]
The 2007 Dodge Caliber and the related Jeep Compass and Jeep Patriot employ a CVT using a variable pulley system as their optional automatic transmission.[14]

The 2008 Mitsubishi Lancer model is available with CVT transmission as the automatic transmission. DE and ES models receive a standard CVT with Drive and Low gears; the GTS model is equipped with a standard Drive and also a Sportronic mode that allows the driver to use 6 different preset gear ratios (either with the shifter or steering wheel-mounted paddle shifters).

The 2009 SEAT Exeo is available with a CVT automatic transmission (multitronic) as an option for the 2.0 TSI 200 hp (149 kW) petrol engine, with selectable 'six-speeds'.[15]

Subaru offers CVT on the 2010 Legacy and 2010 Outback (Lineartronic).

 

Nissan has been advertising their CVT (same source as Jeep's) as being more reliable than a conventional tranny. Fewer moving parts.

 

If you google "rogue cvt rattle" you will find that Nissan customers think otherwise. Same CVT as in our Jeeps.

 

obviously if you google for a rattle you will find problem trannys. what would you expect to find?

 

Point is that you will find that there is a problem with this Jatco made CVT. Nissan was replacing units as they failed (all around 30k miles) and now are working on a software fix. They have also increased the warranty on the CVT to 100k miles to allay any customer misgivings.

 

Anyone know what the Nissan failure rate was?

 

Just found out the strange noise I've been hearing is actually a failing CVT, so you can add 1 more to the list. Luckily I have the lifetime warranty and my new transmission should be in next week. I'm a little disappointed but I still really love the JEEP.

 

CVTproblems

What is very baffling to me is that Jeep knowingly marketed and sold a vehicle with problems. The CVT surging and jerking at low speeds is rediculous. Why would a company sell a product they knew had some goofy characteristics when they are competing against companies like Toyota and Subaru? This is strange. I've written to Chrysler with no response and my dealer tells me the problem of the low speed jerking can't be fixed and Jeep has not sent a service bulletin on it. The rest of the vehicle is great and it performs well on open roads. Chrysler baffles me.

 

Coffeegirl: sorry to hear about your CVT but at least they're backing up the warranty.

Kangrapes: surging and jerking at low speeds? Mine doesn't do that. Try a different mechanic. Or maybe the problem isn't the tranny. Something in the ignition controls maybe? I had an old carburated Ford that surged & jerked and it was because the carb float didn't float anymore. Cars are all computerized now, but it could be something in the ignition or fuel supply causing a similar symptom.

 

I'm not sure what you guys are referring to with the 'surging and jerking' at low speeds. Can you describe the problem in more detail?

 

CVT is just a cheaper alternative for the car companies then a traditional automatic. There is no benefit to the consumer, and it is a downgrade in quality and reliability (IMHO) to a traditional automatic.

 

Well, at 50,000 my CVT has already gone more miles than 2 of my automatics. '86 Buick and '97 Olds both blew trannys c50,000. That said, I drove another Olds over 150,000 w/out problems and a Pontiac just about 250,000 before a problem developed. I was in sales and those vehicles drove all over NNE on all kinds of roads and in all kinds of weather. My Patriot still does a fair number of miles, but sans the loads I used to carry.

 

Surging and Jerking

The surging and jerking at low speed for me entails a jolt that feels like someone hit the brake when you back off the gas peddle at low speed (20 mph). Then when you press the gas again the car takes off. It is more pronouced when the vehcile is not warmed up. The vehicle runs great at a steady highway speed.

 

The surging and jerking at low speed for me entails a jolt that feels like someone hit the brake when you back off the gas peddle at low speed (20 mph). Then when you press the gas again the car takes off. It is more pronouced when the vehcile is not warmed up. The vehicle runs great at a steady highway speed.

You have to realize that the CVT is a kind of cross between a manual transmission and an automatic. It's like a manual in that it has a physical link between the engine and the output shafts. So there will be some manual trans like sensation when decelerating. Unlike a conventional automatic, it can't disengage a bunch of hydraulic clutch packs for a real smooth coast. But it does give better fuel economy then a normal auto trans.

 

Ok, I now what you're talking about with the surging and jerking. However, it's not that much of a big deal. I'm not sure why people would complain so profusely about such a minor thing.

 

CVT complaints, WHY?

My complaint is that it was a surprise after I purchased the vehicle. I can live with it as I like all other features of the Patriot but it is irritating. Also, other CVTs do not seem to have this problem to the extent the Jeep does. I rode in a friend's Murano and it was very smooth. He said he does not have any complaints. I think Jeep dealers should disclose this characteristic to prospective buyers and Jeep should explore a fix. How can they expect to be competitive with vehicles that don't drive smoothly?

 

I'll get used to it

Mine does it all the time even after it is warmed up. It is less harsh but it still does it. For the first time today I heard a clunk when it did it. I am amazed that with today's technology this can't be mitigated. Jeep has yet to get back to me on my request to fix it. Such a great little vehicle with a goofy characteristic. Oh well, I bought it so I am stuck with it. it is more comfortable than my Hyundai. I just hope it is as reliable. I got 160000 trouble free miles out of it.

 

Getting worse

I think I have a serious problem with mine and maybe that is why I notice it more. It is getting worse and is now making a clunking noise at times. Also, it just started to do a strange thing while on the highway. While driving along at say 2K RPM, it all of a sudden jumps to 3K RPM and back again. Almost like when a traditional automatic starts to slip. I am taking to the dealer next week. Hoep I don't regret buying a JEEP. I had such great luck with Ford and Hyundai getting over 150,000 trouble free miles. I don't even have 3K on my Jeep.

 

need cvt help

i just boughta 08 patriot had it about 3 monthes now and seems to be driving worse and worse every day it has aconstant mis its labor knocking not to mention the cvt is holding gears shifting hard and slipping it has only thrown one code witch is po726 witch is somthing performance silinoid 1 i have changed the plugs on it but it only helped a lil can any help it only has 47,875 miles on it

 

i just boughta 08 patriot had it about 3 monthes now and seems to be driving worse and worse every day it has aconstant mis its labor knocking not to mention the cvt is holding gears shifting hard and slipping it has only thrown one code witch is po726 witch is somthing performance silinoid 1 i have changed the plugs on it but it only helped a lil can any help it only has 47,875 miles on it

I don't recall the warranty on the 08 but on the 09 it is only 36,000 or 3 years unless you are the original owner.

Chrysler/Jatco does not sell parts for the CVT. So it is around 3000 to 4000 dollars US to replace.

 

Meeting with Jeep regional and Tech rep

I have a meeting with the Jeep regional and tech rep tomorrow regarding the low speed jerk I experience with my CVT. Also, going to discuss the lack of acceleration from a dead stop. I almost got killed because my Jeep Pat would not move. Will let you know what they say.

 

Also, going to discuss the lack of acceleration from a dead stop. I almost got killed because my Jeep Pat would not move. Will let you know what they say.

yeah, that's one of the downfalls of the cvt, revs but takes a second to find the best gear.
We have an altima for a work vehicle and it doesn't behave like that. Maybe tuning, maybe power to weight ratio, let us know what they say.

 

CVT Jerking What the Jeep Rep says

Met with the regional rep. My vehicle was warmed up after driving to the dealer and it only jerked a bit. We got into a new limited that was sitting on the lot. As soon as we left the lot I slowed to stop and it jerked very hard. The rep said "wow". As we drove through a residential area at 20 mph it kept doing it every time I let up on the gas. The technical rep who was in the back seat said that it had to do with the clutches and fluid temperature. There is one set of clutches in the CVT. When the fluid gets warm the jerking lightens up. It is an issue that they are trying to find a fix for. The problem is that they do not want to fix one problem and cause another problem. When I used the auto stick the jerking went away. Bottom line is that Jeep knows it happens, they said they are trying to fix it (I really doubt it), and in the mean time when I am in very slow traffic I use the auto stick until the vehicle is warmed up to where the jerk is not as noticeable. According to the regional rep, Jeep has people reading these forums regularly. I hope they read this and work at fixing this obvious deficiency in the CVT.