What is a boost controller? What is boost spike?
external wastegate or internal wastegate actuator has a base spring setting. For the sake of description lets say it has a 5 psi spring. That means that when 5 psi boost hits the diaphragm the wastegate opens. The boost controller is installed inline with the hose that leads to the pressure side of the wastegate and the other side of the boost controller is a vent. When the boost controller is in the closed ( You cannot blow through it ) position, all the boost pressure goes to the wastegate and you have a stock boost level. As you open the boost controller, boost pressure that would have gone to the wastegate now diverts through the boost controller. What this does is fool the wastegate. If you bleed off 5 psi on a 5 psi system it will take 10 psi to open the wastegate resulting in a 5 psi boost increase on your boost gauge and a lot more power from the engine. This is the simple version and results vary with the system, the size of the hose being used, the sensitivity of the wastegat
