[CSG Mike]

Originally Posted by mike the snake

Thanks, that helps.

What about something a little more in-depth? Like when does one or the other turn on, or off? When are both on?

I'm getting my car tuned in a week or 2, and was hoping I could have a better understanding of just how my tuner is going to figure out which type of FI is used and when.

For FI (I'm getting a FB kit installed) at WOT, dose the tuner run the DI at say, 90% and then just ramp the PI up as needed?

What about partial throttle? Does the ECU switch between PI and DI or use both together instantly?

You just asked enough to write a few textbooks on. If you can do that, you'd be doing it for a living