my disco is a 200tdi, i have been upping the boost bit by bit, recently flushed out the intercooler and cleaned it so air actually flows through it now, all turbo pipes replaced, inlet manifold flushed out and new gasket, uprated fuel pump, some more boost, still doesnt smoke with pump maxed out, now revs upto 5.5k with just a touch of power loss at just over 5k, boost is at 1.3 bar (not advised as i have a spare engine on low milage i could replace it with) and it goes like fooooooking stink, real low down power and pulls like fook once its on boost, would put it upto a v8 anyday.
allisport not fitted yet as i only found out about a one on the cheap earlier today when i had all this done along with a new cambelt, water pump, idler, tensioner, gaskets etc etc etc
the drivability is amazing, i prefer to change up quick and have the tourque accelerate me instead of revving the balls off it, can drive round at good pace at no more than 1500 revs now not a problem.