Turbo lag on a 2011 X5 35d

[newmanium]

You're probably talking about the throttle lag - see if it goes away in DS mode. Been noticeable on my last two BMWs, assume it's a "feature" designed to improve MPG.

You can reset the transmission shift points by doing some procedure where you hold down the gas pedal for 30s with the ignition halfway on (something like that, it works in all BMWs, do a search).