Smooth shifting in the Z requires getting used to the car.
How you shift from 1st to 2nd varies depending on your rate of acceleration & RPMs , once you get used to it you'll see the difference.
When I first got my Z it was driving me crazy, had me thinking about clutch mods. It was me that needed the mod LOL.
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2014 370z with Sport Package Brilliant Sliver
2006 Brilliant Silver G35 6MT Coupe Sport / The infamous Oil Consumption defect ended our love affair