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I was having issues with boost spikes and unstable boost throughout the RPM range on my turbo Honda build. After completely eliminating my electronic boost controller from the equation, I eventually realized my eBay wastegate actuator wasn't up to the task. In this video I swap in a Turbosmart IWG75 single port actuator, but not before tearing down both actuators for comparison.
My turbo is a TD04H 15G that was part of a Greddy kit and came with a 5 psi internal wastegate actuator.