Jason,
The flash point on alcohol is way lower than that of water. Simply.. laymans test is you pour some alcohol on your hands.. blow on it.. it disappears rather quickly. Same experiment with water.. takes a lot of hot air to get to disappear.
Look at the jets used with a water injection kit. They are very very small and produce a very fine mist.. reason so it can be consumed with the air traveling past the nozzle. On the other hand, alcohol can be run with a much larger nozzle.. and due to a lower flash point 80 degrees vs 180 on water.. its flashes with a little heat.. and saturates the air thoroughly.
Now the temps leaving your turbo are 10 degrees per PSI. At 30 PSI its 300+ambient= 380 degrees. Your IC brings those temps down.. the bigger the IC.. the more the reduction. But still your looking at 130-140 degrees at best with the largest IC. Much higher than 80(flash) so your covered.
Guys that run into this problem were using the NOS style nozzles for shooting alcohol into the motor. The fix was point the nozzle against the airflow.. Problem was more prevalent on cold winter mornings, with a cold IC, and a cold engine. As far as distribution..
You dont want liquid shot into the motor, but a mist that totally saturates the air charge(atomization). Thats what fuel injectors do. Not squirt. hence why temperature plays a role, as does the nozzle used.
That plenum window would be sooo cool. The chicks would be all over me with one of those.. Mount a camera to it with a in cab TV.. the possibilities are endless.

Voyeur Plenum.. Then some neon to go around it.
Vacuum is way over-rated
