I have 2007 z4 3.0si coupe. Shifting from 1st into 2nd feels pretty notchy, no grinding at all, just not very smooth. All other gears are smooth as butta... I've been driving manuals for over 30 years, so it's not the driver. It doesn't matter how long the clutch has been engaged, it's still not smooth going into 2nd gear. Is this normal or do I have a problem? The car has less than 1k miles on it, so maybe it still needs some break-in, I'm still being very gentle on it till I break it in properly.
Just make sure to leave plenty of room between you and the car in front of you if in traffic before doing that cause you'll be doing 45mph before you know it and end up slamming on your brakes for the guy ahead of you who's accellerating at 3-5mph/sec where you will be closer to accellerating at 9-10mph/sec. The other technique that I do is to shift around 2500 rpm's. This one is tricky, but with some practice you can get the gas/clutch mixture down pat and it'll be as smooth as a baby's bottom.