Thread: Battle of hp & torque

That's actually very interesting. What PSI where you running? Supporting mods?

RRRIIIIIIIIIIGHT

At 4k rpm tq peaked at 255 18psi on a t-25, fmic, 50lb top feeds, 255lph walbro, greddy e-manage. I think my boy is just a tuning genius. His sr20 also t-25 powered with pretty much the same mods as me makes more tq than hp as well. 246whp with 265tq something like that. I guess you guys are missing something in the tuning area. I added BC2's and I have yet to dyno again but I'm sure I gained some hp and a **** ton of tq.

You are wrong.

You have left out important information. You say both cars have the same HP. Do you mean peak HP? And at the same rpm?
Then you say they have different torque outputs. Do you mean peak torque? And at what rpm?

Add in all that info and you may have something we can talk about.


Fixed that for yah.

Incorrect. You don't need much torque at all to move a heavy truck. What ever power you're producing with that 1,000 ft. lbs. of torque I can produce with 100 ft. lbs. and more rpms. They will both move the truck the same.

Oh, there is. Countless arguments about power this, but torque that. You're doing it yourself. You say you need tons of torque to move a truck. You don't.


You don't need that torque from the engine. If you have the power, you can create the torque you need with gearing. So, yah, technically you're right. You need some torque to move the truck. A lot of it. But the torque doesn't have to be created at the flywheel. It doesn't have to come from the engine. All the engine needs to do is produce the same amount of power (torque output can me minuscule) and you can gear it down to accelerate the truck.


*sigh*
I'd love to untangle that one but I'd rather not right now.

I like to relate the HP/TQ to electrical power and voltage. Power and voltage are related, yes. But the same? No.

Power is VoltageXAmps=Watts (or horsepower). Think of Voltage as your rpm, and Amps as your torque.

You can have 8000volts from a static discharge, but it won't power the smallest of light bulbs. You can have 1000amps of energy, but without the electrical pressure from voltage, it won't happen without extremes in wire size lol.

So, for the record. HORSEPOWER IS WHAT MATTERS

IT is the direct relation of how much POWER the engine is producing. Whoever has the highest average hp over the curve, with the right gearing, will win. Every time.

A diesel truck can have 2000lb of torque, and weigh 2000lbs. But if it only has 1hp, it isn't going anywhere fast.

Rally cars have huge torque at the bottom end. And push a ton of boost. But they do this to generate a nice flat hp curve. HP is the direct relation of how much power the engine is making, and having a nice high avg hp curve will make for a fast car. The torque number is just generated to relate the power to rpm. That's it. As far as the speed of the car, it can be totally irrelevant.

If we are going by the power that the engine produces at the crank it is one thing. Yes Ben, using gearing as long as you do the math you should technically be able to find enough Tq. to move anything.
My truck example was merely to say if a truck weighs 2,000lbs I doubt if you hook up a sentra to that load it is going anywhere. Maybe if you changed the gearing to the lowest gearing possible then maybe it would work.

TQ isn't a movement. But a force causing movement. Once it starts moving, then work is being done. HP is a pure calculation of work being accomplished. True, gearing will allow for torque multiplication, but again this is a steady-state force on the wheels of the vehicle. Turns out gearing helps get the engine into its "powerband".

TQ cause of the movement. The movement is kinetic and can be expressed by work being completed. 550lbs moved 1 ft per second is 1hp. 10,000,000lbs moved 0 ft per second is still... 0hp. Regardless of how much force is applied to it.

basically, kinetic energy is measured as work being accomplished (in hp). Potential energy would be the torque applied.

Im a mechanical engineering major so I know the formulas. I was attempting to relate the concepts to what normal people could easily relate these forces too. My words didn't describe it well...fail

Thats like my buddies 97 Powerstroke. it makes 4XX ft lb torque.....but only 180-200hp to move that heavy truck across a distance.