i talked with a well reknown turbo guy and he did mention that the 66/71 HTT was having some trouble do to the extra drive pressure the smaller wheel(71MM)created so they(the guy i spoke to)enlarged it to a 74MM and took care of the problem! just some FYI i have gathered since i'm in the same boat,looking for a good comp turbo but also a DD without breaking the bank! the HTT 66/71 with a 14CM housing is def one that was at the top of the list for me!
I didnt knoiw that about the ss housing, I know the II 66/74 on Corries truck is way laggy compared to a 66/71 htt on my buddies truck.
Can a 13cm SS housing be had for a 80/74 turbine wheel?
I dont think D/P would be an issue with the stainless housing and the 71mm , the cast housing yes . the stainless housing has 4 times the gating as the cast .
cast = 2 - 5/8" wastegate ports
stainless housing = 2- 1" wastegate ports .
with the stainless housing i had to crank my gate waaaay tight just to tighten the exhaust flow enough to even out boost between the 2 turbo's , the exhaust flow between the two is not even comparable .
66 with standard ex-housing.. Love it!
OK guys:
There are 13cm and 16cm stainless housings for the 71mm turbine and for the 74mm turbine. I can get any of those 4 turbine housings for $600.
A 66/71/14 (standard cast housing) will run $1699.
A 66/71/13 or 16 Stainless housing will run $1999