CVT- Continuously Variable Transmission

CVT vs MT calculator

This on-line performance calculator computes the advantage of using a CVT, compated to the MT (manual transmission). You input the car's specifications and click on «Calculate». It will estimate how much time [seconds] is necessary to accelerate a car from rest to 100 km/h using a CVT and using a Manual Transmission (MT).

-To simplify "departure" calculations, we will consider the IVT case (instead of CVT), because it allows continuous ratio variation from rest.
-In both cases, all energy losses such as cluch transitions, aerodynamics, etc, are neglected, and we consider the road is horizontal.
-Torque/RPM curve is considered as horizontal line. The torque value used corresponds to the value at the maximum power RPM.

-These calculations are described on the section "How much doesCVT benefit?".


1-Input data: Vehicle Specifications:
mass: [kg] power: [cV] @ [rpm] Tyre Diameter[m]
Note: 'mass' value must include passengers and luggage

The manual transmission ratios correspond to "output speed (wheels)" / "input speed (engine)". Thus the differential ratio and tyre diameter are considered:

1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear
Note: Common ratio values increase, from about 0.05 up to 0.035.
2-Execute the computation:
.     ,orinput data.

3-Output data: Acceleration Time to attain 100km/h:

Manual Transmission [s] Continuously Variable Transmission [s]

Was at 100km/h on the gear #.

Note: you must add 2 to 3 seconds due to gear shifting.



The CVT takes only% of the time to accelerate to 100km/h, compared to the MT, (with same car and engine).
Thus, the Continuously Variable Transmission (CVT) is% more performant than the Manual Transmission (MT).


[ this site is under contruction]  [created: 12 Jul 2002, updated: 19 Set 2008 ]  [ designed by ]