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What is the difference between AMT and CVT auto transmission in maruti cars?

Published On : 2016-08-30 23:49:40.0 vivek
Category : Dealers
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To answer your question, I would like to highlight the differences between all the available 'automatic' transmissions in the market today - AMT , DSG , CVT and triptronic. Firstly the main difference between a conventional automatic and these newer automated manuals/DSG is the way the power is transmitted from the engine to the transmission/gearbox.

(A) In automated manuals, there is a clutch or rather 2 clutches ( in DSG there is one for even gears and another for odd gears). The way the power (torque actually) is transmitted is the same as it would in a manual gearbox with the one differnce being that the computer does the clutch/de-clutch and shifting action for you based on a algorithm. Pros and Cons: The advantage of this being the light weight ( at times 50 kgs lighter than dual clutch) but one does get the jerky shift which is why more and more companies are going over to the heavier and complicated but much smoother dual clutch.

(B) Now for CVT, it does not have gears at all ! (technically speaking, they have infinite gear ratio). The gear reduction in this case is with a set of belt drives. They may or may not have a torque converter to transfer torque. This in theory would be the most efficient transmission as they help keep the engine at the RPM in which produces the most FE or the most power, atleast that's the theory anyway! So that's the major differentiation between them all . It would in theory be just as efficient as a manual but smoothness and driveability depends a lot on the calibration performed by the company. While they work brilliant in a track and while driving fast , they are quite jerky in city bumper to bumper traffic !

CarDekho Helpdesk on 2016-08-31 10:25:58.0
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