First thing was to get hold of some parts.
Most important part is the pump. Many sites (US based) talk about the SHURflo pumps like this one:
http://www.northerntool.com/shop/tools/ ... 081_357081
Australian sources for that pump seem to be around $250
The important part for the pump is that it's components can handle some alcohol (if you want to do water/alcohol mix).
Look for Viton valves and Santoprene diaphragm.
I found this Seaflo pump (Part# SFDP1-015-080-31) for $90 on ebay.
And f me if it doesn't look identical except for colour. Coincidence?
I should note that if you're not boosting, you don't need a pump with this kind of pressure (although you need a bit of pressure to atomise the fluid).
The next important part is the spray nozzles. You can buy nozzles from the kit sellers for $60 each.
Or you can get nozzles from McMaster Carr in the US for US$9 each. I bought two of part #3178K77 because I wasn't sure how much I would need to inject. I don't know the postage cost yet either, but it's safe to say that these two nozzles will be much less than $60.
The snow performance ($60) nozzles look like this:
The McMaster Carr nozzles look like this:
These are a full cone shape nozzle.
We need a method to activate the pump. I could do it via the Megasquirt, but aside from not knowing if I have any outputs left to use, I did not want to do more wiring from engine bay to the ECU in the car, so I decided to use a hobbs switch. The one I'm using is honeywell part #76056.
It's adjustable from 1.1psi to 3psi. It's set to 2psi out of the box, so I will leave it at that to start with. So I should get some spray pretty much when it comes on boost.
This switch cost me $50 on ebay, but you should be able to get them from somewhere like RS Components also.
For safety, I'm also going to hook up a solenoid to power on with the pump. This will stop any fluid siphoning into the engine when the pump is off and potentially causing a hydro lock. This is a $20 12v 1/8" NPT ebay solenoid.
So far, the running total is:
Pump: $90
Switch: $50
Nozzle: $25 (estimated)
Solenoid: $20
$185
That is most of the big costs done. All that's left is some brass fittings and hose to make it all work.
You can use your existing washer bottle to feed this install as well. Just add a new fitting to connect the pump to the washer bottle.
I will probably make a custom bottle because mine still has the original bag in it.
