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Originally Posted by TDIwyse
Thanks. I had help with the welding because ... I'm a hack when it comes to that. Should really take a class sometime.
The Turbosmart unit came with 35 psi springs (35 is the "cracking" pressure) and it's what's in there now. Road tested for ~6 hrs of driving yesterday and the mounting seems secure and functional. The dump pipe is routed to atmosphere at this point so I can get an audible feedback on when the gate opens up. It appears the gate is just starting to crack open under drive pressure at peak boost numbers.
Thinking when I get to playing with it I'll try T'ing off the vacuum line for the big turbo's wastegate and route that to the top of the external wastegate (top ports under vacuum helps open the spring) and that way the external wastegate would actually be in the control loop of the DDE ...
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If the external WG is cracking at peak boost it may very well be right where you need it. I would imagine it won't take much release to keep the boost at bay....but testing will certainly tell. Very interesting!