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Vic41


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Vehicle Automatic vs Constant Variable Transmission....
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I have read a bit on the web about the difference between these two and opinions seem to be divided as to which is best.

Just wondered what the GN members (especially the "Spanners") think about the two mentioned.   confuse

Daughter is looking at buying a car at the moment....Thanks.



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Yuglamron


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I used to run a Toyota Prius which had CVT and never had a problem with it over the four years I had the car.

I believe even some of the modern semis run CVT tranny's now. The technology is proven but as everything if you get a "Lemon" the costs are bigger.

The torque going through the transmission on a truck is huge and they seem to be accepted these days.

Like I said the Prius was good, very smooth and with the petrol engine and electric running together the torque figures are impressive.

Remember as well that an electric motor has a much higher torque that most petrol engines of the same KW figures. The CVT managed very well.



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Vic41


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Thanks Yug, I did have an Outlander with CVT also but didn't have it long enough to give an opinion on it, except the good fuel consumption and smooth changes with no jerk etc....Forms of CVT has been widely used on other vehicles, scooters, snowmobiles etc for some time.

 



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Plendo


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I had a lancer with CVT for a few years, could not fault it, however I never towed with it.

The system was initially developed by DAF back in the 60s, initially in a small car (bit like a 2CV), then it was fitted to DAF trucks where it remained for many years. I believe the initial versions used a large Vbelt which used to wear.

It reappeared in cars about ten years ago, but the new versions use a steel belt. 

The principle is very straight forward, where the drive belt is used to transfer power from one wheel to the other, with both wheels able to change diameter, thus gear ratio. The initial ones used two Vbelt pulleys, teh one supplying the drive was squeezed narrower by a system of centrifugal weights, the other was sping loaded, and just followed the first.

I believe the new systems are more two cones set opposite each other with the position of the belt controlled by the computer. 

It is a brilliant system, and very easy to drive.



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Vic41


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Thanks Plendo, appreciated. smile



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Aus-Kiwi


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In a heavy vehicle I would go the auto.. Mind you they are special pieces these days..
With there multiple gears..

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Vic41


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Only for a car AK, technology has gone in leaps and bounds in both types with refinements etc. smile



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Tim thetruckie


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Yuglamron wrote:

I used to run a Toyota Prius which had CVT and never had a problem with it over the four years I had the car.

I believe even some of the modern semis run CVT tranny's now. The technology is proven but as everything if you get a "Lemon" the costs are bigger.

The torque going through the transmission on a truck is huge and they seem to be accepted these days.

 

 I would be very interested to know what makes of heavy vehicles are running CVT's.



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Cloak


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I think you're right Tim the CVT seems to be only available on low output light cars.

The little lady is looking at buying herself a Chery J3 which has a Jatco (Nissan) CVT.



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Vic41


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Well the daughter has settled on a Mitsubishi ASX with CVT, so hope she will be happy with it, time will tell.smile



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Aus-Kiwi


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Ideal for females .. Lol

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Vic41


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She is happy with her choice too AK smile



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Plendo


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Vic, I believe that is far more important than the technical merits of either type of box.



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Aus-Kiwi


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Plendo wrote:

Vic, I believe that is far more important than the technical merits of either type of box.

Who are we to argue ?? Ahaha 



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Vic41


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Thanks Plendo and AK, but and appreciated the advice and opinions given here beforehand as well, thanks one and all. smile



-- Edited by Vic41 on Thursday 19th of June 2014 09:49:18 PM

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