Is AEF an IDI or TDI? Post some pics.
AEF water pump housing connecting bolts are in different location than 1,6. AEF has alternator, water pump and power steering pump with one serpentine belt, which I liked. Engine mount bolts are M10 instead of M8 that every other block has. The one in front of block, under timing belt. Timing belt is narrower than other diesel engines. Crank gear and belt are AEF only stuff. AAZ or TDI timing belt and TDI crank gear will fit.I have AEF in my Audi quattro, several minor differences to other diesel engines.
For now I am leaving it non turbo, and using my freshly rebuilt 1.6 IDI pump and injectors on it. I may turbo it down the road, but Im not looking for power. I want milage, and if I have a turbo Im just going to use more fuel.
I DO understand that many mods to gain power DO help fuel economy.
With more efficiency comes more power and more economy. Without changing the engines displacement or fuel needed for a given RPM, making that fuel burn more efficiently (boost) will in turn give you more power and more economy.