Itsamoto,
Thanks for answering my questions.
So if a 3.2L will work - any chance of a 3.0T or 3.0TDI?
Its kind of a bummer that the best automatic for this car is the 4 speed.
I put a ton of research into this when I swapped my first every Eurovan 24V VR6 out.
The conclusion I came to was that you could use the 3.2L block with the 2.8L 24V head from the Eurovan using custom head studs (available). This would give you the ability to use all the stock intake components.
You would want to scale the size of the injectors up slightly for the added displacement. The computer will take care of the rest. (it will have no idea there is an extra 400cc of displacement).
The big issue I found at the time was simply the cost of the Touareg and Cayenne Engines. People seem to think they are made of unobtainium even though they are the least desirable in those platforms.
As for the 3.0T or 3.0TDI the answer is NO. The engines in the Eurovan are "VR6" engine not "V6" engines.
This illustration shows the fundamental difference. The VR6 is basically just an inline engine with a slight "v" offset. It uses one head. Where a V motor uses two. So the V6 engines take up substantially more space, which the Eurovan just doesn't have much of.
As you can see from the picture. An inline 4 cyl is typically as long as the VR6 but narrower. So engines like the 1.8T, 2.0T, 1.9TDI will fit in the Eurovan chassis. Just need to swap out the transmission for one that bolts up to those engines (if you have a VR6 van now)