I have recently tweaked my 200 tdi. went the whole hog as mine was sloooow.
used this link http://www.stonefisk...uning_Rev.2.pdf
Very informative. Print it out, stand over the engine and understand what is what BEFORE tampering.I took notes as suggested and test the mods out as i went.
As i have an auto 200 the smoke screw was turn 1.5 turns as the engine is never laboured off boost due to the box. Little puff on start up, MUCH better take off from a junction etc due to having upped the off boost fueling.
Turned the diaphram approx 180 deg to the max fuelling, easy to work out once you have read and understood what is what in the pump. Nice haze on full boost now but again never fully loaded up untill it locks into top gear.
And finally i turned up the boost, approx 5-6 turns of the actuator, making it longer, to hold the boost higher. Much improved performance, will get to lock up speed, 45 ish, much easier now and will carry on accelerating over the legal limit.
I have no EGT guage but have seen no ill effect and no massive rise in water temp etc. Again being an auto you don't drive it as hard as a manual. I had to retighten the boost hoses as they were singing...passing boost a little due to around 1- 1.1 bar of boost now. INtercooler upgrades on the cards next.
If you are sensible this is the best mod i believe can be done on a 200 tdi for no cost what so ever.
All the usual disclaimers apply but i like it