There is little reserve torque available, because the torque required and the torque available are almost equal.The error in the mathematics that led to the curve is I believe, when you multiply RPM * f(RPM)^2 and get RPM ^2.7. f(RPM) is the tipoff that it is a FUNCTION of RPM, which in this case is a function that looks like a steep climb followed by a shallow step, then gradual climb after t