Equation to determine PP, roughly

[gamerdog6482]

I wish i took more notice in math class, it is way over my head!

I'll dumb it down a little bit:

Where p is power, t is torque, w is weight, F sub d is front downforce, R sub d is rear downforce, M sub F sub d is front minimum downforce, and M sub R sub d is rear minimum downforce.

 

[trackripper123]

I recently came across an equation that, when use correctly, gives you a number close to your car's PP.

PP = 259*(power*torque/weight)^(0.15) + (Fd+Rd)/2 - (MFd+MRd)/2

where Fd and Rd are the current front and rear downforce, and MFd and MRd are the minimum front and rear downforce.

Let's try it out with a fully tuned Jaguar E-Type.

Plug in the numbers and you get 259*(440*240/1038)^.015+([{0+0}/2]-[{0+0}/2])
That simplifies to 259(440*240/1038)^0.15
That simplifies to 259(157.26)^0.15
That simplifies to 259(2.13)
Which ends up being, low and behold, ~553.
Actual PP for the car is 513.

Keep in mind that the equation does not factor in weight distribution, which is most likely the reason for the higher result.

EDIT: Here is a better looking version:

I noticed root 2 in the working, where in the formula it's just dividing by 2, so which one is wrong?

 

[gamerdog6482]

I noticed root 2 in the working, where in the formula it's just dividing by 2, so which one is wrong?

It's divided by two.

 

[trackripper123]

It's divided by two.

I've just seen it on the computer, my bad, it looked like a root sign on my phone.