Power V Torque

[becks]

How much torque is to much for our cars?

[antigravity]

  craiginmackay said:

Can you use this simple formula to explain why some XR6Ts which make 300KW only make 700NM of torque while others with 300KW make over 900NM?

If power and torque are related I cant see how.

Because the peak torque, and peak power are at different RPM's.

[Kimberley Scott]

Power is what Men do and Torque is what Woman do.

I am confused.

Scotty

[turbotom]

  Kimberley Scott said:

Power is what Men do and Torque is what Woman do.

Good one Scotty...

I like that quote a lot.

  craiginmackay said:

Can you use this simple formula to explain why some XR6Ts which make 300KW only make 700NM of torque while others with 300KW make over 900NM?

If power and torque are related I cant see how.

Craig...

Have a look at a few dyno charts.... you'll see that the shape of the torque curve can be very different even if the same peak power is achieved.

When people quote 300 rwkw and 900nM, they are refering to the peak values achieved.

as an example, lets say two XR6T's A and B, both produce 300 rwkw at 5700 rpm.

The following equation is close enough to calculate torque (Nm)

Torque (Nm) = (Power (kW) * 9549) / rpm

so with both cars ( A and B) torque produced when peak power was achieved at 5700 rpm is 502 Nm.

Lets now say that car A has 205 rwkw at 2800 rpm..... torque is 699 Nm

Car B, on the other hand, produces 265 rwkw at 2800 rpm..... torque is 903Nm

Both cars produce the same 300 rwkw peak power, but Car B will whoop car A's backside because of the increased accelleration rate due to greater torque availability (if it keeps itself together and can get the traction)

I don't know if any XR6T's have 265 rwkw at 2800 rpm (900Nm) which are using the stock Ford BA transmission: and running reliably.

I certainly know my BA 4 speed auto can NOT handle it, even with mods.

Edited 07/09/08 12:50 AM by turbotom