While flange design is interesting, I wouldn't get too caught up on it - as long as the port sizes are relatively close you can get flange adapters made up to fit no matter what the shape.
RE Variable vane turbos, from what I've read you're likely to pay the cost of one of our cars for a single turbo... Yes the idea's fantastic but while the technology is still relatively new (been around for about a decade, but the new Porsche is the first production petrol engined car with one stock) they are gonna be insanely expensive.
Oh and I wouldn't go taking one from a diesel if I were you, unless you already have a replacement engine lying around
well based on the info on them....the pair is rated to 900 crank HP which makes one of them rated to about 450 per.
might try to get a friend of mine to try it out
The turbulence caused by the shape of that rear housing is actually likely to be beneficial. I would have thought that a separate waste gate pipe integrated ~ 1' after the turbo and dump being stepped off the back of the turbine flange would have been better....but packaging always wins.
It's well & good to say these turbos will bolt up to the manifolds with an adaption plate but these turbos are insanely massive and would require major redesign to the engine bay to even get them to fit. Even TD04L's require the firewall to be beaten back & a slim thermo fan installed. Valmes spent massive amounts of time & $$$ fitting his TD05's.
IMO too much trouble unless you've got $30,000 hiding in a mattress.
Dave from RPW said after he finishes his development of the miniceptor & dump pipe setup that he might look into modifying the original turbos so nothing has to get moved or modified due to lack of space. A great move!
from my research I think getting the existing ones high flowed would be best. You dont have to worry about flanges, dont have to worry about size, and dont have to worry about cops or transport as noone will know. Only problems are the limitations to BIG horsepower (should be enough unless you want big ponies high 400's or so I'd say) And the second is waiting for them to get high flowed while your car is off the road, about a week.
I've been thinking and tempted to buy a motor and take off the turbos get them high flowed ready to put in and then put the old ones back on that motor. Like the one for sale on eBay for $850 with the mines computer. Anyone interested in going for a group buy?
While I haven't looked in depth myself, everything I've read so far about those turbos suggests there's very little you can get out of "high flowing" them. Being such a physically tiny turbo, it would not surprise me at all if the stock wheels are as big as you can fit in those housings.