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Old 12-01-2012, 02:15 PM   #224
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Join Date: Oct 2010
Chapter/Region: NESIC
Location: S central CT, New England
2008 STI hatch


Originally Posted by reid-o View Post
if you use vbands in ever joint the fitment needs to be spot on. Whereas you can thread a normal flange ome bolt at a time and slowly tighten each bolt, the vband clamp will not fit without the mating surfaces being flush. It can make it harder to install with even a small amount of tension.
How much misalignment can you get away with?
I am not doubting you, or that there are limits, but Vibrant Performance says of their product: V-band flange assemblies feature a unique "Male/Female" design to ensure proper alignment of the flanges inside the clamp. There is also this type, where the tubing provides the alignment.
While that would not eliminate stresses due to misalignment, it would allow you to first fit it together loosely then attach header nuts to the heads and then progressively tighten the assembly. It would probably mean pulling the engine to weld the v-band flanges on in the first place or you would have to have jigged things up on an existing motor, on a stand, with turbo in place.
I want to do it, but I don't look forward to it.
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