That make me feel a lot better Greyhare. Mine is much simpler than that. The MAF variable controller is the trick.

I epoxied the tank and sealed the leaks. Temporarily hooked up the pump using plain water. With the nozzle removed and redirected into a cooking pot and the pressure gauge in line, I checked the flow and set the pressure to 150 psi. The pump produces pulsations so the gauge needle quivers +/- 10 psi.
A nice fine mist.
A low buzzing noise from the pump but I'm sure it won't be heard over the sound of the engine.
The only thing I did observe that I'm not sure I like is where the nozzle inserts into the adapter, it is recessed a 1/4" because of the thickness of the adapter. When it sprays, droplets of water form where the spray hits the inside of the threaded adapter nozzle hole. If the air flow is high, and it will be when it activates, it shouldn't be a problem.
What do you think Bill?

I'm anxious to reinstall the throttle body and permanently mount the nozzle/plate so I can drive the car while I complete the wiring.
It'* been garaged for 2 months now waiting for the road salt and rain to disappear.

I think Greyhare will agree, you need to counterbore deeper into your TB adapter so the nozzle is flush to the inner surface of the air stream. You're not getting efficient spray any other way.

Or do without the spacer and drill/tap the TB just behind the Throttle Plate. That'* what I'm doing.

Ya, I thought you would say that. Sure am glad I tested it first before sealing it in place.
I will have to use an oversize drill larger than the 11/32" std for a 1/8" NPT tap. That way the tap will be able to go deeper into the hole.

Trial 2 up and coming....

Ideally, the nozzle should be angled somewhat in the direction of airflow, but that'* not always possible.

Make sure you do it in a way that you can actually still tighten the nozzle down in the counterbore. How much deeper do you have to go to get flush with the inside of the adapter?

I will have to go 1/8" deeper to be flush. Angling is not possible but I don't think that will make much difference because the spray is so fine.
It sure doesn't take long to empty the reservoir at 375 ml/min. Even as fine as it looks there is a lot of volume.

You running distilled water? I've actually been running filtered tap water through mine with an inline filter after the tank. Haven't plugged a nozzle yet, but distilled is best.

We have pure mountain water here. Very soft and clean. The nozzle has a screen filter built into it.
Thanks for the tip though.

Do you think Woodburn will be fussy about using this set-up? Some tracks will not allow any fuel additive unless the delivery lines are metal.....no plastic allowed. :?

I don't think they'll ever see it. Put some plastic loom over it so it looks like wires.

The only beef I think they'd have is if you leaked water on the track. And WI isn't considered fuel.

Pot Spray

Looks like a pot of horse power stew you got there
If the output is varialbe based on boost pressure, then how are you able to test the sprayer? Is there a default on amount even if the car isnt running?