Anybody heard of the CVT (continuously variable transmission) developed by Nissan?

http://www.nissanusa.com/innovations....article.image.

CVT should be all over PDK, maybe Nissan patented their CVT technology.

Otherwise, I would think CVT is the ideal transmission.

 

CVT is not some type of modern innovative breakthrough for Nissan . CVT has already been offered in cars by Audi , Ford , Honda , GM as well as Nissan for years .

Did you get the Leaf ?

 

Is this a serious question?

 

As I recall, CVT was conceptualized by Leonardo da Vinci in the late 1400's, so Nissan is not where the gating factor could ever be. For real?

 

cvt is crap. pdk is perfect

pdk+DCT (same exact trans as PDK), and ferrari f1 are the best transmissions in the business right now.

ive driven everything, tips, smg's, the aston ****, e gear, everything.. and pdk/dct feels the best.. the ferrari f1 feels the same as pdk in sport mode. BUT the ferrari layout is better (fixed paddles, manual is default)

take pdk and add fixed paddles that dont move w/ wheel and a manual default with an auto button and a reverse stick and you'll have the best trans setup money can buy.

 

Personally, I do not think duel clutch transmissions are the future. In the end, the complexity of the system makes its future questionable.

The strides that Mercedes and Toyota are making with simple normal auto transmissions is intriguing.

Jason

 

I find this a little hard to believe...but I was at a reputable indy and he was telling me how some PDK's are overheating on the track.

Mdrums drives a PDK hard on the track and I don't think he has any troubles.

Just reporting what I was told.

 

in theory i feel like a cvt makes sence, less moving parts,infinite gear ratios, and the car just sits at the best rpm and never moves, but for some reason its not the best and i dont know why

 

I don't think anybody has developed a CVT that will handle much power.

 

+1. CVT's are crap. Utter junk. It is an auto that doesn't switch gears under load. Frustrating as hell. The DCT, however, such as the one in the GT-R, is one of the best dual clutch gearboxes around.
Toyota has a pretty decent automatic (along with the Jaguar XKR-S, from what I've seen, not experienced), but I still prefer the dual clutches to anything else. The gear changes are instant enough, to have zero lag during gear shifts. Perfect engagement everytime... Instead of coming off the gear, and having that instant lack of torque, there is a quick gear change that puts your right back in the torque curve to hit you in the back a bunch of times.

When I ran my car on the 1/4 for the first time, it felt like getting shoved in the back 4 times, without ever letting up from the first shove. It's a bizarre feeling. But the CVT doesn't come close to it - not even in the same ball park.

 

Wow... a lot of mis-information about transmissions.

1. CVTs do change ratios continuously when pressed for power.

2. CVTs actually have the widest ratio spread of all transmissions.

3. CVTs can be very efficient and are relatively simple in design.

4. There may be limits in hp but Audi offers a CVT that handles over 200 hp on the 3.2L A6.

5. CVTs can be difficult to get used to. They a drone a lot any is some cars the only way to control the ratios is with the throttle position.( depending on car brand)

6. Traditional ATs generally operate more smoothly than dual clutch transmissions at lower speeds but dual clutch transmissons do offer advantages in efficiency ( but at a higher cost).

I am not sure what causes overheating of PDKs but I know that on the newer turbo models if one floors the gas at moderate speeds, the trans is designed to slip the clutch to improve responsiveness. I am not sure if this is the case with the non-turbo models.

For me, I would take a modern 8 speed auto ( like VW/Audi/BMW) for a sedan any day over a DSG/PDK. If a CVT offers a great simple, efficient, cheap solution for a lower priced car, so be it. I guess, if I were no longer able to push a clutch pedal, I would consider the PDK for a 911. Otherwise, I will stay with the 6MT.

 

I don't think anyone here said anything to the contrary.

Everybody who has driven a CVT already knew all of this.

 

1) There was one statement that the CVT does not switch gears under load. They certainly do change ratios. And 2), CVTs are not crap. They work well for the right appications.

 

yralist1: No, I didn't get the Leaf, it is sold already and there is a 12 month waiting list.

 

I am guessing CVT has limited torque issue and that is why it is not widely use.

However, I am just thinking if there are two 911, both with same HP and torque. One with PDK and the other with CVT.

Which one will have the fastest 0-100mph time?

To me, although PDK will have instance shifting, but RPM will drop as soon as you shift resulting HP and torque drop.

Therefore, would CVT be an ideal transmission?