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You can sign in to vote the answer. Almost everyone argues as if they are separate, unrelated values. The fact of the matter is that horsepower is the product of torque and another value — RPMs divided by Torque can exist without motion. It is a capacity to do work. Horsepower can exist only in motion. It is rate of doing work. To refer an engine running at constant load, Power reference is used to extract maximum power.
To refer an engine running at variable loads shift of gears,for eg , Torque is more appropriate. Curves: Torque curve:Torque produced by engine vs engine rpm, at various load on engine. Power curve:Power produced by engine vs engine rpm, at various load on engine. This will be obtained by multiplying torque curve by speed. Refer Power torque curve example Fuel economy curve will be overlapped on above curves for better understanding. Given a power curve, we can obtain torque curve and vice-versa.
Fuel economy curve must be provided explicitly as an overlapping graph. Now it must be obvious when to use what. To get best mileage,follow mileage curve. To get max power, refer power curve. Torque curve will be generally used as a reference for transmission control systems,to know which is next best gear to shift.
Still not clear? Check a real-world example. Note: The curves are specified only at certain load conditions. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. What is the difference between torque and horsepower? Ask Question. Asked 5 years, 9 months ago. Active 5 years, 9 months ago. Viewed 4k times. I'll tell you my confusion: Torque is an indication of acceleration, right?
Improve this question. Zaid Soumya Sen Soumya Sen 1, 2 2 gold badges 17 17 silver badges 39 39 bronze badges.
If either of the great answers below answer your question, please select one as the answer! Add a comment. Active Oldest Votes. This diagram shows a few curves of five theoretical motors: Each motor has a torque of Nm at RPM and so the same peak power at that RPM , and each motor has a peak torque of Nm. In a race where the motor runs at very high RPM, you'd better chose 5.
Why does the power still increase though the torque already decreases with RPM at some point? What happens in the gear box es? So compare different cars by power or torque?
Fuel economy Torque is also a measure of the work the motor does during a single rev. Conclusion In general, power and torque are two measures of the same thing: The strength of the motor. Power determines the racing capability and max speed of the car, but also acceleration capability once the motor has reached a higher RPM Torque shows much clearer what acceleration capability the motor has at low RPM, but the torque at the wheel depends on gear ratios and wheel dimension, so it's not that easy to compare.
And please note that I made several assumptions and simplifications here. About my data I got the motor curves from BMWs press site. Improve this answer. This is a great answer. Great answer. Is "getting to speed" not important in "racing"? I'm really confused by the terms you are using, when is high top end power and when is high low end torque important? I think to a certain extent it's mostly force of habit. Both are important for that - the car with more torque will get off the line quicker, but the one with more HP will go faster before it 'runs out of steam' and has to change gear This kind of clears a bit of dust: The ability to accelerate i.
However, top speed is determined by power, which is maximal in both petrol and diesel vehicles at a higher engine speed than the max torque.
So, what I can make out is torque is needed when referred to city driving and horsepower when referred to highway driving. For highway gear shift, we should use power curve. Read: in. Well it had to start somewhere. And it can't be about torque only, otherwise all racing would be done in diesels. Show 6 more comments. Torque is work, horsepower is work rate In the context of engines: Torque indicates how much load an engine can carry for a certain distance in a certain amount of time.
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