03-30-2016, 09:19 AM
Join Date: May 2006
Location: Charleston SC
Total Cats: 723
Originally Posted by Corky Bell
Thanks so much 18.
In theory our dnpipe won't fit. The taco thing was designed by me 26 years ago and copied by ........?? It used an IHI turbo then. Old jig is gone forever.
With the design we made with FM, the turbo moved a bit. New dnpippe needed.
Then the A/O and it moved again.
I do have a fixture that can mount any manifold/turbo combo and build a dnpipe from there.
The proper spec is:
material selection: user choice
turbine exit and dnpipe entry of the same ID
Expansion in diameter as the dnpipe progress aft
putting the wastegate vent back into main pipe (if at all) 18+ inches later
Exit diameter varies according to customer need
Do not weld fully around the outside of the flange/tube joint
Grind flanges flat after welding
debur and buff or paint, matl dependent
adequate clearance to all other items
I remain absolutely certain we built one that was perfect about ten years ago.
Do you happen to have any of the standard downpipes you used on your older manifolds laying around that hook to a stock exhaust on a 1.8 NA? If I would be willing to give fitment a try on my car. Would pay shipping both way. I will give you a call a bit later today.