Speed didn't increase with downshift
My RV on 2010 Ford E350 V10 chassis has 30K miles. Every time I downshifted to 3rd to get the speed up on an incline, the rpm would shoot up but the speed hardly climbed with it. I would just take i...
Forum Discussion
" You did not get more power simply by downshifting because the V10 has a such a flat toque-curve"
This is not correct. If there is a flat torque curve then the downshift should make more horsepower. Assume the torque was the same before and after the shift. Then when in the lower gear more rpm with the same torque before the shift will be more horsepower to the rear wheels.
But due to the size and weight of the unit the extra horsepower is not going to accelerate very fast but it should accelerate until he reaches the point that the horsepower demand is equal to what the engine can produce.
A flat torque curve will give about a 45 degree horsepower curve. The older Cummins had very flat torque curves thus with the horsepower increasing at the rate it did with rpm is why they made very good towing engines.
It is horsepower that moves things up the mountain.
This is not correct. If there is a flat torque curve then the downshift should make more horsepower. Assume the torque was the same before and after the shift. Then when in the lower gear more rpm with the same torque before the shift will be more horsepower to the rear wheels.
But due to the size and weight of the unit the extra horsepower is not going to accelerate very fast but it should accelerate until he reaches the point that the horsepower demand is equal to what the engine can produce.
A flat torque curve will give about a 45 degree horsepower curve. The older Cummins had very flat torque curves thus with the horsepower increasing at the rate it did with rpm is why they made very good towing engines.
It is horsepower that moves things up the mountain.
