okay, so if I decide against the VNT-17/VNT-20 (20 is difficult to fit, 17'll still do 25psi, no?) what would be my other options to net 25psi. I'm just trying to compare costs at the moment. New exhaust manifold/turbo VNT-17 is $950 from KermaTDI. How much would getting new parts (manifold turbo wastegate if not internally gated) get me? I figured I'd be looking at over $950 already, so in and of itself it seems the VNT-17 is better money wise, for me atleast. I'm going to try just outright running it on an Apex'i AVC-R, which allows for RPM and gear based boost control.
turbopressure is not evrithing, there is also flow.
a VNT17 will need more boost than a VNT20 to give the same air.
VAG got a GT1749v and a GT1749VB, the last one is for the 150hp models, wich will give more air (correct me if i'm wrong).
You can find T2 flanges (a T2,T25,T28, GT20, ... and even some T3 i tought will fit) on some vw TD's wich use a T2. than buy a gt20v will be much cheaper than this 950UD/CAD.
I got a good VNT20 for sale.
Like you can see, a VNT20 even on a 1.6 give no lag when you got the right fuel adjustment.
On the 1.9TDI's (150hp stock) they go with stock turbo to a good 200hp, so i think its good enough though
Greetz, Benjamin