- Feb 7, 2010
If that's true, all torque curves would follow the horsepower curve at exactly the same distance. Horsepower tends to rise steeply, equalling and then surpassing the torque curve at 5252. Are you saying the torque curve cannot continue to rise as the horsepower curve begins to flatten out? I'm not talking about redline or just before when power falls off the table, I'm talking about the slope of the horsepower curve as opposed to the slope of the torque curve. Possibly that was not clear. I guess I should have said rate of increase instead of increase.Not so, Danno. The relaltionship is a direct proportion, as rob ss said. By definition, horsepower equals torque (in pound-ft) times rpm divided by 5252. That's why they are equal at 5252 rpm. In other units the constant will be different, but the linear relationship is the same. You can't have a situation as rpm increases where horsepower is decreasing while torque is increasing. When you hit the point in rpm where horsepower has peaked and started to drop, torque must also be decreasing.