When does the boost kick in on an fi engine?

Is it only at wot?

If its not only @ wot than how is it tunned @ part throttle?

 

Magic!




J/K

The amount of fuel delivered is always relative to the amount of air flowing into the engine no matter what throttle position.

This is either done by tricking the ECU into telling the fuel system to deliver more fuel (GReddy) or with a rising rate fuel pressure regulator (Vortech).