Cat vs Powerstroke torque curves
I drew out what I expect the Powerstroke torque curve would look like relative to a Cat C11. I think it is very interesting how these curves reveal the different pulling characteristics of ...
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Ductape wrote:hone eagle wrote:4x4ord wrote:hone eagle wrote:
Mine peaks about the same , at around 1650 ftlbs . it has never come out of overdrive.
EGR climbs a bit, boost climbs a lot and if the dash is displaying instant fuel mileage I get chest pain.
I take it you have a 485HP C13? You don't have to be much over 1300 rpm to be making 400 hp.
Volvo D12 set at 465 -500 on cruise.
Flat land running -1200rpm @65 mph - bit over 9mpg
And note the revs. Large trucks are not cruising at high revs, they are near peak torque for best fuel economy. So the torque rise theorized as the revs drop is not available in the way you mean it. There will have to be a downshift to raise the revs above peak torque before that works.
They don't cruise at high rpm but as soon as they start pulling up a hill they drop gears and engine pulls down in each gear to try to deliver the necessary torque. Many industrial type engines such as this C11 are used in applications where a constant rpm is necessary. The high torque rise allows the engine to maintain a more constant rpm.
The Powerstroke has a tremendous capability of delivering rear wheel torque but it uses high rpm and gears to do it. It really is very well designed to meet the needs of an RV tow vehicle.
