So then gents

I'm considering adding a small injector into the intake of my charger to get some cooling of the charger but mainly to improve the atomization of fuel to air which I would hope should improve power and economy

Surely you bunch of turbo nutters have already tried this ? Not with water / meth but gasoline in small amounts ?

biggest issue I know of for a turbo pre injector is you must target the injector so it sprays at the compressor nut,. this means the fuel doesn't smash into the blades at 100K rpm it hits the hot nut and evaporates to small enough droplets to not cause damage ( or at least rapid damage)

Not an issue with a roots charger as the blades are running so much slower and are much more substantial

surely this must have been done?

 

I'm doing it (water/meth) on my electric supercharger ...into the volute. Works well

 

Cool ( no pun intended) what sort of flow rate and pressure are you using ?

 

Don't remember the exact size I have there but I used this table as a guide (allowing for rotary flow/hp) : nozzle_selection_guide.jpg (2183×1721)

Pressure is around 250psi