The RAM air flappers are normally open without vacuum. So when driving around or at idle there is vacuum generated so the flappers are closed. When you hit the gas, vacuum drops and so the flappers open.
I did the same. Great idea to control it on your own. I open the flappers driving in the highway and I can see drops of up to 15 degrees in the incoming air - when hot out. I have EFI so I can see that measurement live.