Holley EFI Turbocharger Electronic Boost Controller 557-200

The boost control functionality in the Holley ECU gives you the ability to tweak the boost level of your engine/turbo system electronically within a certain range. It does not have absolute authority over boost: it operates “on top of” a core mechanical control system. All of the system configurations on which the Holley system will work can function without the Holley system being present. The best time to use the Holley boost control functionality is after you have a mechanical system that is proven and stable. Once things are working “on the spring” then it is relatively easy to add on the electronic controls to be able to control your boost to a higher level.