I've never seen a single instance where closing the throttle is going to increase available torque at a given RPM - or even keep it the same. I've always requested more torque by opening the throttle farther. Now I understand what Cobb is saying above but there are some key phrases that, after reading other threads here, I believe people are missing. (e.g. "in just" and "in and of itself.")
I guarantee you that if you keep the boost from tapering off and the throttle blade open, the stock bell-shaped torque curve will turn into more of a decreasing plateau and that there will be a significant increase in horsepower all the way to redline. Keeping the manifold pressure up is easy, just takes a boost controller. Getting control of that throttle so that you get "unrestricted" flow to the manifold is not so simple.
