I responded to the other thread today about this, but since crazy2 isn't looking there any longer and asked for an update, I'll paste it here- Water/Alcohol Injection Results
When I first installed the system I was concerned about over injecting but it seems that my concerns were unfounded. To start I used two .008" nozzles and one .012". No difference in performance or mileage was noted. Next I went to two .012's and one .008 and noticed a very modest increase in power with fith gear roll-on's at 50 to 70mph. No ill effects of any manner were observed at this level. Now, I'm running three .015" nozzles @ 70psi on a 70% water 30% isopropyl (92%) mix. The system rarely gets used around town unless I'm taking the belt around to the other side or heading out to the property, because it's spraying enough at this point to start loading up the engine at idle. I don't hit the toggle unless I'm on the highway doing at least 45mph, at that point there is sufficient rpm to properly utilize the mix. Roll on power is unmistakably increased and hard accelerations (3,4 & 5) to get up to speed on an on-ramp no longer make sweaty palms. I still don't have a pyrometer, can't justify the expense at the moment, but the reduction of EGT's has already been verified in another thread here recently. Also, I picked up about 1mpg better mileage.
As an afterthought, with pump, hoses, clamps, brass bits & plumbing, nozzles, wire & switch, I have about $250 wrapped up in it. I'll try to get some pics by tomorrow evening.