Forum Discussion
bluwtr49
Jul 19, 2014Explorer II
Regarding the "lugging down", Cat recommends that a diesel be allowed to "lug" for the best efficiency. I think they define lugging as letting it the rpm drop to the peak torque speed and only downshift if that rpm can not be maintained. To do this with the Allison I just keep it in the Mode setting and the performance is amazing.
However, a caveat is on extended grades running at peak torque the engine RPM is too low for maximum cooling so a downshift is necessary if coolant temp becomes excessive.
In other words, don't worry about "lugging" it.
However, a caveat is on extended grades running at peak torque the engine RPM is too low for maximum cooling so a downshift is necessary if coolant temp becomes excessive.
In other words, don't worry about "lugging" it.
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