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Originally Posted by tqtran
isn't that the rpm that VarioCam kicks in?
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I don't think it is
just the VarioCam. Since the VarioCam varies the timing of the intake camshafts to optimize performance at any engine speed or load. The camshaft angle is continuously varied by the twin rotary valve vane adjusters.
On the 987, at about 4500 RMP, the torque curve is at about optimum- 191 lb.ft. (Max being 199)
And for the 987S, at about 4500 RPM, the torque curve maxes out at 236 lb.ft.