HP vs Torque

burningman wrote:

wilber1 wrote:

RCMAN46 wrote:

4x4ord wrote:
Torque and horsepower ratings together help to explain the power curve of an engine They are both valuable numbers.

If a gasoline engine with 440 hp at 5800 rpm and a peak torque of 465 lb ft at 3400 rpm was stuck in a f350 with a rear end gear ratio of 7.1:1 it could be expected to pull identical to a 440 hp Powerstroke diesel installed a similar truck with 3.55 gears.

I would agree only if the gasoline engine was turbo charged or if they are only operated at sea level.

440 HP at the flywheel is 440 HP at the flywheel. If the gearing allows an engine to make that much, it doesn't matter. HP is a measure of work being done.

I think what he was getting at was the non-turbo engine’s performance is measured at sea level and will decrease at altitude, giving it a disadvantage out in the real world.

Both lose power at altitude, the turbo just loses less but that is a turbo vs non turbo thing, not a diesel vs gas thing. 440 hp is 440 hp regardless of the altitude.