A cool feature on Borg Warner EFR turbos is that the blow off valve is integrated into the compressor housing. Another EFR feature that we love is an integrated boost control solenoid. All you need is to hook this bad boy up to your engine management system and you get boost control in a simple clean package. These features simplify and clean things up in the engine compartment improving reliability and saving weight. Having all of this in one package also cuts down your fabrication time for building a turbo system and eliminates failure points. With a high flowing internal wastegate, a boost control solenoid and an integrated BOV you are actually saving money as well by not having to by these parts individually.
We replaced the standard Borg Warner wastegate actuator with this high performance IWG-75 actuator from Turbosmart. The Turbosmart actuator has more diaphragm area for quicker response. The diaphragm is also made of very heat resistant silicone/nomex, a much higher rated material than stock. The Turbosmart actuator is also highly adjustable with springs from 3 to 26 psi available. By using a spring pressure close to the intended boost pressure, you have much more positive wastegate control which often equates to a faster build up of boost and better boost response than you can get with just signal control.
The top of the Turbosmart wastegate actuator quickly spins off so the springs can be easily changed or the actuator quickly serviced if needed.
We replaced the OEM Borg Warner plastic BOV with this cool Turbosmart Kompact shortie BOV. The Turbosmart BOV has an aluminum body that is not prone to cracking and has a fast acting O-ring sealed piston valve that replaces the leak prone diaphragm of the stock valve. The Turbosmart BOV can handle 30 psi of boost without leaking.
The Turbosmart Kompact BOV is a direct bolt on replacement as you can see here. The Turbosmart part is more responsive due to its piston design and its larger valve and radial exhaust port areas compared to the OEM Borg Warner part.