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I know the Synapse 50mm WG pretty well and how to set it up.
What is the A/R rating on your gt42? What is your peak boost goal, at what psi do you want the wg to open to maximize responsiveness and is it dumped to atmosphere or recirc'd? Also do you have the 60 lbs preload spring and 60 lbs main spring installed? The wastegate by itself is pretty controllable, the boost controller just provides an additional level of response, duty cycle will have to obviously fine tuned.
Adam
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