[Matt D.]

A boost controller limits when the wastegate actuator sees boost. The wastegate is what vents exhaust gases from the exhaust before the turbo to prevent the turbo from spooling up more and creating more boost. Manual boost controllers are simply a ball and spring, the more tension on that ball the more boost pressure it will take to bypass that ball to get to the wastegate actuator to stop making boost. Electronic boost controllers use a pressure sensor and a solenoid controlled by a small computer.

Turbo timers are nothing more than a stopwatch to keep your car running after driving it. It allows you to park your car, lock the doors and walk away while letting your car run a few minutes longer to allow to turbo to cool. If you run your car hard and shut the engine off without letting it cool down the oil will literally bake inside the turbo, in turn ruining the bushings/bearings much more quickly than if it were treated properly.