rhagfo wrote:
When I am turning about 1,200 to 1,300 rpm, going up hill and give my 5.9 throttle, and it picks up speed it isn't HP at that RPM, it is almost all torque!
And age old argument (torque vs hp). Here's a geeky lesson from an engineer:
Torque and horsepower is like space and time, one CANNOT exist without the other. RPM is what couples them together.
In physics, power is what gives force (acceleration) at a given speed. Torque is a method of PRODUCING horsepower, which in turn powers you up a hill, or launches you from a stoplight.
A Cummins, especially a big ISX on a semi, makes massive torque at 1300 rpm, therefore generates much more hp than an 3.5 EB at the same rpm. RPM for RPM, Cummins blows EB out of the water.
However, EB has something a Cummins doesn't have - rpm. EB can generate horsepower by another mean: revving.
I can bored everything with 100 calculations, but simply put, in an ideal world (8 speed ZF is pretty close),
two engines of the same horsepower pulls you up a hill equally as fast, just via two different means (one lugs and makes massive torque, one revs and makes up for low toque).