By keeping the wastegate in a closed position more often, a boost controller causes more of the exhaust gas to be routed through the turbocharger, thus reducing [[Turbocharger#Turbocharger_lag|turbo lag]] and lowering the [[Boost (automotive engineering)#Boost threshold|boost threshold]].{{citation needed}} A boost controller also reduces the need for a stiffer spring to be used in the wastegate.{{citation needed|reason=References are needed to show what benefits this results in.}}
=== Limitations and disadvantagesDisadvantages ===
EvenRegardless withof anthe electroniceffectiveness of the boost controller, wastegate actuator springs that are too soft can cause the wastegate to open before desired. ExhaustThis due to the exhaust gas [[backpressure]] is still pushing against the wastegate valve itself., This backpressure can overcomecausing the springvalve pressureto without the aidopen of the actuator at all. ElectronicTherefore, controlthere mayis stillan enableupper controllimit to the effectiveness of a boost tocontroller overfor doublea [[gaugegiven pressure]]spring ofstiffness in the spring'swastegate rated pressureactuator.
TheTo solenoidprevent andexcessive stepperboost motorspressures alsoin needthe toevent beof installeda infailure, suchthe aboost waycontroller needs to maximizebe thedesigned advantagessuch ofthat [[failure mode]]s.Fordo instance,not ifresult ain solenoidany ispressure installedbeing tobled controloff. boostFor electronicallyinstance, ita shouldsolenoid-type beboost installedcontroller suchshould thatdirect ifall theair solenoidto failsthe inwastegate thewhen mostit commonis failurein mode (probablythe non-energized position) (the boostcommon controlfailure fallsmode backfor toa simplesolenoid). wastegateOtherwise, actuatorthe boost levels. It is possible a solenoid or stepper motorcontroller could get stuck in a position that lets no boost pressure reach the wastegate, causing boost to quickly rise out of control.
Also, the electronic systems, extra hoses, solenoids and control systems add cost and complexity. Nonetheless, in recent times most automobile manufacturers use boost controllers on their turbocharged engines.{{citation needed}}
The electronic systems, extra hoses, solenoids and soforth add complexity to the turbocharger system. This runs counter to the [[KISS principle|"keep it simple" principle]] as there are more things that can go wrong. It is worth noting that virtually all modern factory turbocharged cars, the same cars with long warranty periods, implement electronic boost control. Manufacturers such as [[Subaru]], [[Mitsubishi Motors|Mitsubishi]] and [[Saab automobile|Saab]] integrate electronic boost control in all turbo model cars.
