I have my setup set to tuen on two 12 GPH injectors at around 8psi and I am still amazed at how fast the boost jumps up to 10-12psi, and thats just on a 20% meth mix. It really makes my truck spool up quickly and it keeps my egt temps down.
I thought the H2O was just used to lower EGT's enough to run that much more fuel, which it is in most tractor/truck pull cases. BUT
It does wonders for my truck, and that is just running washer fluid which is about 15% meth. I am running the snows stage 2 without any of the electronic controls, just on and off with 2 injectors.
As long as I am pushing over 7psi boost I can start the pump, without adding any more pedal I get and additional 8-10psi of boost and the truck takes off pretty good, when I let it off it goes back to normal. I love it and will be playing with it more.