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In closed loop the BLM cells go up to 15. A given cell is chosen based on MAP and RPM. Then come cells 16,17,18. 16 is used at Idle, 17 occurs during decelleration, and 18 covers accelleration. Why the PCM uses 16,17,18 is still not fully understood.
Here is a Matrix of the Cells (taken from the LT1-Edit Mailing list)
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.