Re: Power in 136bhp 2.4 JTD
Yes, its pretty normal.
It has very severe turbo lag off boost.
I had a loan of one for a few months, once on boost it was effective enough and not a problem to make progress on the open road.
In traffic I found it a bit of a pain though, until you knew *exactly* where the lag resided (about 1rpm below 1800 rpm I think!) - a particular pain when in second gear just in the lag zone and you want to do a quick burst into a faster lane, 1st gear is also very short so you have to learn to drive around the lack of flexability.
A remap would improve things I'm sure.
I'm not a doctor - but I really do recommend braking later