Torque vs. HP Revisted

[ERA Chas]

Originally Posted by AL427SBF

My spin on that would be Cobras tolerate maximum torque better if you have a live axle and slicks - and that's for strip performance only. I don't think I would want a live axle on a road course

Yes, you've figured that out.
Since you now define road course use, build for HP. You only leave from rest once there. If you build 600+HP, you'll have more than abundant torque to get off corners provided you can put that power down.
Cobras= 90" WB, IRS and poor aerodynamics; not good for high torque applications.

[AL427SBF]

Originally Posted by ERA Chas

Yes, you've figured that out.
Since you now define road course use, build for HP. You only leave from rest once there. If you build 600+HP, you'll have more than abundant torque to get off corners provided you can put that power down.
Cobras= 90" WB, IRS and poor aerodynamics; not good for high torque applications.

Sort of gets back to the original proposition, maybe were talking past each other. Don't need to build for 600+ HP, need to build for the broadest torque curve the motor will support, HP will fall in-place as a derived result.

Since you now define road course use, build for HP. You only leave from rest once there.

Actually, anytime I want to accelerate I will be calling on torque, all gears over a broad RPM range. Ohm's law analogy ...

V=RI
Torque = Current (I)
HP = Volts (V)
Motor Efficiency = Resistance (R)

High Voltage without Current, will power nothing
High Resistance without Current, will power nothing
High Current, regardless of Voltage or Resistance, will kill your ass

[olddog]

Originally Posted by AL427SBF

Sort of gets back to the original proposition, maybe were talking past each other. Don't need to build for 600+ HP, need to build for the broadest torque curve the motor will support, HP will fall in-place as a derived result.

Since you now define road course use, build for HP. You only leave from rest once there.

Actually, anytime I want to accelerate I will be calling on torque, all gears over a broad RPM range. Ohm's law analogy ...

V=RI
Torque = Current (I)
HP = Volts (V)
Motor Efficiency = Resistance (R)

High Voltage without Current, will power nothing
High Resistance without Current, will power nothing
High Current, regardless of Voltage or Resistance, will kill your ass

In electricity:
Watts is the measurement of work where 746 Watts = 1 Hp
Watts = Voltage * Current

Voltage can be thought of as the pressure that pushes current through a resistance. It takes 1 volt to push 1 ampere of current through 1 ohm of resistance -- Ohms law.

Resistance should not be thought of as being equivalent to efficiency.

The above is true for Direct Current (DC). AC gets more complicated as power factor comes into play.

[patrickt]

Originally Posted by olddog

In electricity:
Watts is the measurement of work where 746 Watts = 1 Hp
Watts = Voltage * Current

Voltage can be thought of as the pressure that pushes current through a resistance. It takes 1 volt to push 1 ampere of current through 1 ohm of resistance -- Ohms law.

Resistance should not be thought of as being equivalent to efficiency.

The above is true for Direct Current (DC). AC gets more complicated as power factor comes into play.

I tried to bait ol' Chas down this path last month. But that fox was just too sly (see my post below). Now, with Al, I'm not so sure....