CVT transmission discussion.


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Canew

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Jul 26, 2005
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Hello everyone.

It has been mentioned that one will feel the the acceleration (pick-up, in normal lingo) for cars fitted with CVT transmission is not good. I am wondering why is this so, since the ratio of the gears as constantly changing to suit the car's speed at that time. I would think that the gear ratio would be optimised. Please comment and/or correct me if I am wrong.

Thanks.
 

Big Kahuna

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Dec 15, 2004
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My own experience....I tried my bro Honda Jazz 6 or 7 speed CVT, although the pickup is not as fast as manual gear, it certainly faster and smoother than any other auto mode that I have driven so far including Friend's and relative's Accord, BMW 5 series and Merz C200 :lovegrin: My own Kia auto gear pick up is even more misserable :sweatsm:
 

clicknick

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Apr 13, 2005
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Low end torque also plays apart.

My toyota S-CVT have rubberband effect, something well known on CVT transmissions. Step accelerator, RPM goes up 1st, then speedo goes up shortly after.

But CVT really smooth and comfortable.

http://www.autozine.org/technical_school/gearbox/tech_gear_cvt.htm#Rubber-band-effect
Rubber band effect: when the accelerator pedal was pressed, conventional CVT immediately brings the rpm up to a high level. The engine put out its maximum performance with the corresponding level of noise but the car slowly catches up in acceleration. This gives one the feeling of a slipping clutch.
 

Canew

Senior Member
Jul 26, 2005
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My own experience....I tried my bro Honda Jazz 6 or 7 speed CVT, although the pickup is not as fast as manual gear, it certainly faster and smoother than any other auto mode that I have driven so far including Friend's and relative's Accord, BMW 5 series and Merz C200 :lovegrin: My own Kia auto gear pick up is even more misserable :sweatsm:
Oh I see. Thanks Big Kahuna. That was an insightful comment. (all based on personal experience!)
 

Canew

Senior Member
Jul 26, 2005
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Tampines
hjgoh.spaces.live.com
Low end torque also plays apart.

My toyota S-CVT have rubberband effect, something well known on CVT transmissions. Step accelerator, RPM goes up 1st, then speedo goes up shortly after.

But CVT really smooth and comfortable.

http://www.autozine.org/technical_school/gearbox/tech_gear_cvt.htm#Rubber-band-effect
Rubber band effect: when the accelerator pedal was pressed, conventional CVT immediately brings the rpm up to a high level. The engine put out its maximum performance with the corresponding level of noise but the car slowly catches up in acceleration. This gives one the feeling of a slipping clutch.
clicknick, thanks for your personal insight too! :)
 

Scaglietti

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Jan 14, 2005
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One of the better CVT is found on the Fiat Punto 1.2A (Mk2b). It does an amazing job transmitting from power from the engines to the wheel. Pretty responsive too.

Someone on the mycarforum was so impress by it and thought it was a 1.6L car instead of 1.2L.
http://www.mycarforum.com/forum/gforum.cgi?post=1718363
BC
 

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