Dan,
"Why the 3 nozzles?"
I am using 3 (as opposed to 1) to more evenly distribute the flow of alcohol across the boost range. This prevents bogging or knocking at various part throttle conditions, and allows a small amount of alcohol to come on early to prevent "transitional" knock as some call it.
"What boost "on" points do you set them at?"
I am still experimenting with this (as always), but I typically have the 2 smaller Aquamist nozzles come on at 5 and 9psi, then the bigger NOS type nozzle at about 12psi.
"What kind of solenoids do you use Fuel or NOS type solenoids?"
The solenoids are not fuel or nos specific, but are for any fluid, and are chemical resistant because they are made of plastic (polypropylene I believe). I am still testing them for longevity, but they are almost a year old now and I've run quite a bit of methanol through them.
"Isn't there a delay from the time the pump spins up to the time all nozzles are on? "
I activate the pump at about 2psi to "precharge" the system. There is some pressure loss if the pump is in the trunk, so I will be installing a 125psi pump back there soon to see if that helps. Right now I have fuel injection pump up front to reduce pressure loss.
"When you're at WOT are all 3 nozzles on or do you progressively or sequentially turn them off? "
All 3 nozzles are on at WOT. I have never had a need to reduce flow as the car accelerates, especially when you get to the load of 3rd gear.
"How do you tune it to keep the system from flooding the chambers with alky? "
I'm not certain I understand the question. I am using the nos nozzle as the "main" nozzle and it has changable jets that regulate the flow. If I needed more or less total flow of alcohol, that is the jet I would change. I use the Aquamist nozzles for the lower boost levels because they can flow a smaller amount and still have good spray pattern.
"Can you use something other than boost pressure as a trigger? Such as Injector Pulse Width...ESC Knock...RPM? "
I am sure there are many ways one could trigger the alcy. The controller on my system was designed as a pressure switch only. This seemed like the most logical way to do this, as its mainly the higher boost pressure that causes knock (and high timing, but I stay away from that). Aquamist does make a system that steals a signal from one of your injectors to pulse a solenoid. But what happens if your using a lean spool chip? If you control from ESC knock, the knock would have already happened, but it would be a good safety device.
I would recommend doing a search for Bob Avellar and Steve Hill. They (among others) have done extensive experimentation with water/alcohol injection, and both use multistage systems. I have learned a lot from their writings.
Eric
