Saturday, March 10, 2012

Advantages & Disadvantages

Advantages & Disadvantages 

The advantages of a CVT Transmission is that the engine does not develop constant power at all speeds , they have specific speed where torque, horsepower & fuel efficiency are at their peak levels. Because there's no gears in a CVT transmission the CVT can change engine speed as needed to access maximum power as well as maximum fuel efficiency. This allows CVT to deliver quicker acceleration compared to an Automatic transmission or manual transmission while delivering superior fuel economy.


The Disadvantages of a CVT Transmission is in fact user acceptance. because a CVT allows the engine to rev at any speeds, the noises coming from under the hood sounds rather unusual compared to an Automatic transmission and/or Manual transmission. The changes in engine speed sounds like a slipping transmission which is perfectly normal in a CVT but it is signs out trouble in an Automatic transmission. When pushing the accelerator all the way in an Automatic transmission there's a sudden power burst but in a CVT Transmission it provides smooth rapid power increase when pushing the accelerator all the way through, the driver usually thinks a CVT Transmission is slower but it usually out-accelerates an Automatic transmission. 


Some Automakers of CVT transmission have tried making it feel like an Automatic Transmission while driving they've done that by setting up the CVT to creep when taking your foot off the brake this provides the same feel with an Automatic transmission. Some Automakers have made a CVT Transmission that offer manual mode that changes gears like a manual but without the clutch just like an "tiptronic transmission" 


Early CVT Transmission were limited on how much horsepower they could handle, there's been concern with long-term reliability. Advanced technology has let Nissan create a CVT for their Nissan maxima, which can handle 290 horsepower. 



3 comments:

  1. Low mechanical efficiency is another problem with CVT, this should not go unnoticed. CVT has a substantially higher internal friction loss compared to manual and automated manual transmissions. To illustrate this, my 2015 K13 Micra with 1.2 L/80 HP engine can do 161 km/h at peak power RPM. The manual version can do 170 km/h at a lower than peak power RPM. Difference is due to the higher friction loss. It is true that, regardless of instantaneous speed, a CVT can operate the engine at the most efficient RPM (either for fuel economy or for rapid acceleration, depending on the demand from the throttle). However, for most of the cases, this effect is canceled by the low mechanical efficiency, making the transmission inferior to twin clutch automated manuals, in terms of performance and fuel economy.

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  2. what would be better transmission for a ATV ?

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    Replies
    1. according to my research and using ATV with cvt,i think if you want to buy ATV for commercial purpose cvt is the better option.

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