3.0d Turbo lag issue..

[Ohsoslow]

Hey guys, have been searching for last few months, have replaced and checked all I've come up with off google etc, but still no solution. Perhaps my problem is normal.. I didn't notice it on other x5s I have driven though, but then didn't drive them all the time!

Basically it feels like I have next to no power under ~2500rpm, then it goes really well. Is this amount of lag normal? I can hold car in 6th, and put foot down and boost will slowly climb from ~2200rpm, but if I hit a slight incline and I'm below 2200rpm, car will slow down.

basically, is this normal? If not, any ideas on what might be wrong?

Have changed maf twice, checked vacuum canister and lines, solenoid for turbo, all seems good. Removed intake manifold, removed egr, cleaned that all out best I could. No fault codes relating to engine. (Frustratingly a tcm fault has appeared today..)