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
RCMAN46 wrote:
Did a little research. It was difficult to find a torque curve for the Ford V10. I found some data and made a curve on Excel.
The V10 is anything but flat on its torque curve.
Also found some curves on Chevy engines. If you look at the never Chevy they have torque curves that are very flat. Some better than the V10.
Chevy Curves
Looking at the V 10 if the op was at or near 3400 rpm then the downshift may have put him on a lower hp portion of the curve when the engine went to 4400 rpm. Not knowing what transmission he has for sure or even what the gear change was this can not be determined for sure.
The V10 drops off very bad above 4000 rpm.
Thanks for the power graph. I guess I just expected too much out of the V10. So before the downshift, I was around 3000rpm, wanting a little more push, I downshifted and the RPM shot above 4000 to nearly 5000rpm. From the graph, the engine is not producing any more horsepower than before the downshift in that upper RPM range. Thus there was little or no increase in speed. Had I stayed in gear and gave it more throttle, I would have maximized the power. The downshift cause me to miss the optimal power point so to speak.
As everyone has pointed out, I should just give it more throttle and just let the box roll up as fast as it can on its own. :)
