Changing from 3.73 to 4.10 gears
Hello all, After towing our new Reflection 320MKS from Eastern Iowa to Estes Park Colorado and back, I need more power for the hills. I have a 2015 F-250 with the 6.2 Liter engine. I have 3.73 years...
Forum Discussion
wnjj wrote:Huntindog wrote:4x4ord wrote:A flat power curve makes it even more impossible.garyp4951 wrote:
Yes your torque will be the same, but a higher number gearing will always give more torque.
I was at a 4x4 truck pull where they see who can pull the other one backwards, and a old 1980 GMC 2500 with 4:56 gears, and small tires was pulling new Fords, Rams, backwards while they were smoking their tires.lol
Like I said I can downshift, which provides a higher number gear ratio resulting in the engine speeding up. This yields the same torque on the rear axle because the Cummins ISX 15 liter engine has a flat power curve over a three gear range of the transmission.
Show your math
A flat power curve (i.e. same HP at the different engine RPM’s in each of the 3 gears) means the same wheel torque in all 3 gears since the road speed is the same. Same power equals same wheel torque applied at the same rate (road speed).
In order to have a truly flat power curve, the torque curve is decling inversely proportional to engine RPM. This means a downshift results in higher RPM (lower torque) which is then multiplied back up for the same wheel torque.
Yup,
Here is the power and torque curves for our Cat C15. You can see from the graph that the power is flat from about 1400-2100 rpm.
