My understanding is that 1st gear does not have a mechanical lock from the engine to the transmission where as gears 2 thru 7 do. It's probably to keep the car from smoking the tires and to minimize damage from people flooring it at every stop light! In my '09 370Z 7AT the shift from 1st to 2nd is a kick in the rear and is usually when I really feel the acceleration kick in.
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