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Originally Posted by catback
Manually shifting a factory spec automatic is usually a waste in my opinion. It'll make you feel fast but you won't be that much faster.
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Yep. My last car (Lincoln Mark VIII) felt quicker when I manually upshifted it, because the shifts were faster than normal and it'd squawk the tires on the 1-2 shift. But others with the same car who have run them at the track universally report getting better times by just leaving it in Drive and letting the tranny do its thing.
I suspect the same would hold true for any modern electronically-controlled automatic--the computer should have a pretty good idea of when to prepare for and command an upshift to best match the engine's power curve.