hansrobert Posted December 14, 2011 Share Posted December 14, 2011 I have a 2011 450h and it has a continously variable transmission. I was curious if anyone knows at what speed it achieves its most efficent ratio? Thanks! Quote Link to comment Share on other sites More sharing options...
lemon Posted December 15, 2011 Share Posted December 15, 2011 Isn't the idea behind a CVT is it always being in the most efficient ratio based on speed/load etc.? Quote Link to comment Share on other sites More sharing options...
hansrobert Posted December 15, 2011 Author Share Posted December 15, 2011 Isn't the idea behind a CVT is it always being in the most efficient ratio based on speed/load etc.? Yes it is but perhaps my question is not specific enough. What I would like to know is the speed at which my 450h will achieve the most efficient ratio. Thanks again! Quote Link to comment Share on other sites More sharing options...
katzjamr Posted December 15, 2011 Share Posted December 15, 2011 coasting at any speed would be the most efficient i would think. Quote Link to comment Share on other sites More sharing options...
jaswood Posted December 18, 2011 Share Posted December 18, 2011 Isn't the idea behind a CVT is it always being in the most efficient ratio based on speed/load etc.? Yes it is but perhaps my question is not specific enough. What I would like to know is the speed at which my 450h will achieve the most efficient ratio. Thanks again! Modern day gasoline engines have two high efficiency ranges, low, cruise, RPM wherein pumping losses are high but frictional losses are low. WOT with pumping losses zip and frictional losses high. The HSD control computer is constantly adjusting the CVT to minimize FE based on overall conditions. So there no good, exacting, answer to your question. Overall FE optimization, "cruise" optimization,...likely ~55MPH. 55MPH. Quote Link to comment Share on other sites More sharing options...
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