• May 13th 2010 at 8:37AM
  • 15

As automakers throw everything in their arsenal out there in an attempt to meet ever more stringent emissions guidelines, the transmission is becoming the area where great improvements can be made. Many automakers are working on complex new transmission designs that will increase efficiency and Renault is no exception. The company has announced it will extend the use of its six-speed efficient dual clutch (EDC) automatic transmission across the entire Megane line-up.

Renault touts the EDC for its ability to improve fuel economy, which leads to reduced emissions. The company claims that the high-tech trans alone can reduce fuel consumption by 17 percent over a standard automatic transmission. When driving, the EDC setup is quite similar to a conventional automatic. There's no clutch pedal and the transmission carries out shifts automatically or via a flick of the up/down lever on the gearshift. This transmission could later see use in additional Renault models and we'd love to see it make the journey over to Nissan as well.

[Source: Green Car Congress]

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    • 1 Second Ago
      • 5 Years Ago
      I can think of alot of Nissan's that would be better with the EDC, the first one that comes to mind is the Versa then the Sentra, and since there is an automatic 370z why not add a EDC to it! That would be Sahweeetnes. The dual clutch tranny's (when you can shift them) are awesome they improve mpg while not taking away from the fun to drive factor.
      • 5 Years Ago
      I doubt the 17 percent improvement in fuel economy. Automatic transmissions do not reduce mpg by that much. One should always compare mpg with an automatic versus mpg with a manual trans. The difference on small cars is very small.
        • 5 Years Ago
        Transmissions cause the loss of about 5% to 10% efficiency in an ICE. According to the gov, it's 5.6% in driveline losses total, of which the transmission may be the biggest part. But you are stating that this transmission will IMPROVE gas mileage by 12% over and above having no transmission at all! I just don't see how that's possible. You're going to have to show some proof of what you say.
        • 5 Years Ago
        It's not an automatic transmission, it's semi-automatic. Each gear has to be manually selected, the clutch is activated automatically.
        • 5 Years Ago
        Man, you are a bit lost. You can't compare this dual clutch automatic transmission to a traditional automatic transmission...they're totally different beasts...

        If you were correct, then why is it that VW's DSG automatic transmissions acheive better fuel economy than their manual transmissions, when bolted to the same engine?

        There are real fuel savings to be had with these dual clutch transmissions...

      • 2 Years Ago
      The EDC has unfortunately a big problem of reliability. Please see forums by typing "Bruit EDC" on google. (french sites)
      • 5 Years Ago
      Every time I look at one of these things I think about how complicated it is and how likely it is to break down and how expensive it will be to fix. No sale.
      • 5 Years Ago
      what could be simpler.. oh that's right, electric drive with 1 gear and no clutch at all
      • 5 Years Ago
      This may be an option for people who want to feel shifts- maybe replacing manuals...

      However, Nissan has a new CVT that makes a 10% improvement in fuel consumption over the previous generation CVT, which makes a 12% fuel consumption improvement over an automatic (based on the Versa- which offers both options)...


      The new CVT has lower friction and a wider range of gear ratios- leading to both better accelleration and better mileage. So the new CVT offers superior performance, but some may prefer the sensation of shifts (makes it fees sportier)- so there is a place for both.

      Given that the Megane and Sentra are on the same platform, it wouldn't surprise me to see this in the next Sentra (whch should be comming fairly soon) to give it a more sporty feel.
        • 5 Years Ago
        Except you really don't feel shifts with this style transmission...
        • 5 Years Ago
        It may not be a hard jolt (like some previous automated manuals), but you can definitely tell when revs go up and down with new gears, feel the difference in torque with RPM, and when it shifts- just like in an automatic...

        Other than the "sporty" sensation of the car shifting, a DSG in this application has no benefit over a new-gen CVT. New-gen CVT's in the same application are less complicated, lighter, smaller, smoother, provide better accelleration, provide better fuel efficiency, etc.
        • 5 Years Ago
        Suckers! 21 speeds would be much better. I can't wait, 82 speeds are going to be great!
        More and more complexity is exactly what the ICE cars need, perfect, all our oil dependency problems are solved. Imagine how wonderful all these gears would be if they put them in the Leaf. Oh yeah I forgot, the Leaf does not need all these parts and gears but they are a good way to produce revenue in service and parts.
        • 5 Years Ago
        "In the Versa, the CVT is quicker and more fuel efficient than the manual or automatic... But some people claim that it "feels" slower due to the lack of shifts, etc...."

        This reminds me of a comment made here about a video at ProEV.com, a site dedicated to the first EV to win a sanctioned auto race against gasoline cars since about 1908.

        The commenter said that he liked the sound at a certain point, where the EV lapped one of the gas cars. In his mind, he was listening to the awesome power of a gas engine accelerating out of a corner, as the driver shifted madly. In my mind, I was listening to the gasser desperately trying to keep up while the EV glided by with little effort.

        So I guess it's all about perspective, isn't it? And about certain fetishes people hold.
        • 5 Years Ago
        Fair enough
        • 5 Years Ago
        I'm with you EV.... Although the DSG vs. CVT does bring up a few questions...

        In the Versa, the CVT is quicker and more fuel efficient than the manual or automatic... But some people claim that it "feels" slower due to the lack of shifts, etc....

        So EV's may have superior performance, but without the noise and shifting of a conventional car, will people acknowledge that performance? Will EV makers have to artificially add sensations (like with the Maxima CVT)? Will we end up with subjective reviews claiming the EV's are slower but test numbers showing the opposite- like with CVT's vs other transmissions? Will this have an effect of buyers?
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