Except that doesn't take into account
A; Tire type/size
B; Suspension type
C; Shocks
D; Weight distribution
E; Trans type stick/auto
F; Converter/clutch
G; Starting line RPM
H; trans brake/foot brake

It's no secret that just like anything else in racing there are different levels of tuning. The fast guys put as much power to the starting line as possible. That is power x SLR x torque stall ratio. Others run huge tires and less gear for consistency. That being said as power goes up you will reach a limit of how much SLR the track can take. Some guys can go both quick and consistent with SLR that others say won't work. Depends on how hard you want to work at it.
Doug