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
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.
