I just got done doing a few mods to my friends ecodiesel he just picked up a few weeks ago. It does NOT have a td pump, its pretty much stock except for the custom 2.5" exhaust. tweeking the pump and adding a bit more fuel and about 12psi boost, She's a bit smokey off the line but clears right up as soon as you hit 2,000 rpm and well it blows the doors off my 96 passat tdi with a chip, untill he hits about 90mph then i walk by him. (he has the crappy tranny, so he can only geo 100mph or so) so from my experience eco;s can be moded, but not as fast as my TRUE 86 jetta td. thats just a rocket. (24psi and a gills pump, now thatst a honda smokin combo
) so the ecodiesels have there place too, and they can be made pretty quick.
good luck
ps: i have not posted on the board much lately because i was in the hospital, i was hit by a drunk driver while riding my bmw r66/6, just got home a few days ago so if anyone was looking for me thats where i was.
hopefully be working bye dec or early jan, i am stuck in a wheelchair for now. (at least i dont get my hands dirty, i just watch and give orders what to do, let my friends do the manual grunt work. but at least they might learn something working on there own cars.
chris