A torque based cam timing control method and system

A torque based cam timing system and method for an engine having dual independent camshafts is disclosed that includes a two sets of ROM based calibration tables containing values for intake valve closing and valve overlap, a first set for best fuel economy and emissions and a second set for optimal power over the operating range of engine speed. A power index value indicating a driver desire for fuel economy or power is used to interpolate between the first and second set of tables to calculate values of intake valve closing and valve overlap that are optimal for all altitudes.