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11 months ago
My 2018 Subaru Legacy 3.6R has a CVT, and I have wondered why it is programmed to change ratios in discrete steps (like a conventional automatic transmission would) rather than varying continuously.
I see a couple possibilities in the comments and answers to this prior question:
CVT on 6 cylinder cars
If the ratio varies continuously, it feels and sounds odd to a driver used to conventional transmissions ("like a car with a slipping clutch").
There's greater wear on the transmission during ratio changes, so limiting the frequency of changes improves reliability.
Is it likely one of these, or something else?
Jun 15, 2022 at 15:56
I suspect it's due to how they have designed the actuator that controls the ratio between the input and output drives. While a truly continuous CVT is certainly possible, and I believe there are examples of this in the "wild", Subaru may have decided that it made more sense from a reliability/cost-effectiveness or other factor to use an actuator that moves in discrete steps.
Without knowing what their design criteria were it's unlikely we'll know for sure.
Jun 15, 2022 at 16:49
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