Wastegate upper banjo??
#2
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you should have a hose from the cold side before the throttle body going to the bottom side of the wg and a hose going from the cold side before the throttle body to a boost controller then to the top of the wg. By adjusting the boost controller you are varying the pressure on top of the diaphram of the wg and increasing or decreasing the boost pressure.
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yep! And just pick up a cheap manual controller. This is the one I have. Its cheap and gets the job done. Boost Controllers, Manual Boost Controller kit, RPS-BOOSTMAN | RacePartSolutions.com
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#9
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You only do that if you want to run about double the boost of what the spring is rated at ie 7psi spring will make 14psi of boost. The bottom port should be boost referenced. The blow off valve should be vac/boost referenced to the intake manifold after the throttle body.