All turbos use mechanical wastegates. The electronic part is just the ECU using solenoids to be able to control the wastegate. For example, the 3000GT VR-4 uses 2 boost control solenoids. One for lower rpms and the other for higher rpms. Most of those guys bypass them anyways. A manual boost controller has it's own spring, which is adjustable, that controls the wastegate. An aftermarket electronic controller, like my AEM TruBoost, uses a solenoid the same way, but you tell it when you want it to open. You input the wastegate spring pressure, then you can tell it how much percentage you want it to go
about stock. All of this is the same for internal and external wastegates. Wastegates are just controlled by manifold pressure by a vacuum line.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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