Quote:
Originally Posted by Old Mechanic
CanadianDriver » Technology » Auto Tech: Nissan’s CVT transaxle
According to this article the CVT Nissan uses in my Altima approaches 97% efficiency, virtually identical to a manual transmission. The 97% figure is at the bottom of the first page.
I feels like a direct mechanical connection, and the torque converter locks up at 18 KPH, when you accelerate gently.
regards
Mech
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Theoretically.
"Under optimal force conditions the pulleys of the variator should exceed 97%
efficiency, although additional losses exist associated with events within the belt itself.."
But not in practice
.
Source:
CVT Efficiency Thesis
In reality multi-gear Manual transmissions tend to be 85-90% efficient while Automatics with torque converters tend to be around 75-80%.
I've noticed more and more CVTs getting torque converters to improve low speed performance but that reduces efficiency. Torque converter Lockup doesn't eliminate the efficiency loss completely though, I think?