| Wastegates each have springs rated for certain amounts of boost. When the pre-set amount of boost pressure is applied to the spring, it opens the wastegate. The stiffer the spring the more pressure it can sustain before opening. Now there are two ways to run more boost on the same turbo. You can get a stiffer spring in the wastegate which will stay shut longer, or you can alter the amount of boost pressure the wastegate spring sees. The latter is what a boost controller does. It uses an electric solenoid to minimize the amount of pressure the wastegate sees. When the boost controller senses the desired boost level is achieved, it opens the solenoid exposing the wastegate spring to the full pressure, which then opens the wastegate and maintains the boost level.
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