I was going down an on ramp onto Hwy 64. There was a jeep in front of me doing the same. It had snowed, and the road was very icy. In my Subaru, I am moving an appropriate speed down the ramp, but the jeep in front is "cutting up" and deliberately goosing his Jeep to make it go sideways...like when they are "drifting." I'm about the freak-out seeing all this and I immediately try to slow to a stop because I can PLAINLY see that there is a bridge crossing the highway at the bottom of the ramp and the road under the bridge is coal black and dry as a cob. That jeep hit that clear spot sideways and started rolling at the same rate had been sliding. And two lanes of oncoming traffic had to slam on brakes to make sure they could stop in time. I'm sweating bullets watching him, and the oncoming traffic, and the guys coming down the ramp towards me. Amazingly, the jeep was the only one to actually get any damage and no one else collided.
So can I safely say we have consensus on the OP's question that both are capable of putting the same torque to the ground, but the higher HP engine will be able to put the max torque to the ground or the PTO at a lower RPM without bogging the engine? That's probably what he is concerned with??
A good example of HP would be for those of you who drive your tractors on the road and tow things. We tow wood in the trailers behind the tractors. Up some decient grades in road gear. IT only requires so much torque for the given weight to crest over the hill. But the more HP you have under the hood, the faster you can crest it. I can maintain speed with my 34hp tractor. But if I were to pull the engine and drop in a 15HP motor, I would likely have to down shift a gear of two (to increase the torque at the rear wheels that the smaller motor lacks), and this will be a slower treck up the hill, but it would still do it.
Points taken. I would have to admit that the bulk of my experience with boosting HP has been in supercharging. In forced induction via roots based chargers the increased HP of the blower ALWAYs also increases torque at a lower RPM. It is a very linear torque curve and a lot of fun.
Since HP is a mathametical calculation using torque AND rpm, if you boost the HP at a given RPM, the torque increases as well.
I guess it could be said that you actually increased torque (since that is what they CAN measure) and as a result, it also increased your HP.
The only way to increase "peak" HP and NOT increase the torque is to gain the HP by increasing the RPM. Since HP is a function of torque (force) and speed (rpm in this case) to gain HP, you can either increase the force (torque) OR increase the speed. But you dont necessairly have to do both.
Well here is a dyno that is part of the basis of the opinions I have gathered over the years. This one is based on speed and not RMP but the car hits just under 60 mph in 2nd gear at redline.
You will see that at about that time it is making peak torque and stays linear even as HP increases. In addition there is a point where HP increases and Torque actually decreases. This is in a 1.4L Mazda engine.