Yeah if your nozzle is lower then the tank the water will just drain out. Also you would be surprised how much extra water is used even just between coming on at 3 psi and coming on at 8 psi.

 

You could however use just a solenoid and get rid of the boost pressure switch. But only to substitute it with a full throttle switch (like on a nitrous set-up). You would save fluid by not injecting unless you did a full throttle run.

This way has its obvious downfalls though. But could be great if your an on/off driver like myself. I ether baby the car, or go full out. Not much in between driving...

 

I'd say the biggest concern is still finding a nozzle that works and isn't a pain in the *** otherwise.

 

I read through this whole thread 3 times, and I don't quite understand what the problem is with the nozzle.

The SUE25B or SUE28B will both flow an adequate amount if you want to run 20psi... if you want to run less boost, maybe not the best option.

SUE18 looks to flow a bit less, unless it's modified with a drill like Dudemaan recommends.

The real problem is navigating the Spray Systems website IMO.

 

I am running a nozzle that is slated to flow 380cc @ 20psi (sue18)...I tested it, and it will flow 300cc TOPS if you're lucky. Drilling it is a whole different ball game given the circumstances, I'd hate to get a bit broke off inside a $70 piece.

The SUE25B and SUE28B look fine, but they need some decent pressure to perform, and if it's set to come on at say 8psi the atomization may not be where it needs to be to keep the compressor wheel happy.

Ill be calling them again soon.

 

After Spending lots of time reading this thread and the Spray website, and doing lots of conversions, I am going to be going with a SU23 nozzle.

at 12 PSI this nozzle has an advertised flow rate of 445 CC/Min
at 20 PSI 725 CC/Min.

Of course, when I get the system put together and Bench test it, we will know if those numbers are accurate.

 

Keep us updated, if it works out for you and it still atomizes well at 12psi I will probably go that route..

At what amount of water will it be too much? Just wanna make sure 725cc isn't going to be over kill

 

Well I tested my SUE18 and spraying it into my face the droplets do not feel as small as I expected. They look small but don't feel it.

 

so according to your facometer how many microns do you think each drop let is ?

 

If you look at some of the pinned posts by Howard Coleman and BDC, there has been a lot of calculation and proven testing that the greatest benefit in cooling and knock/detonation prevention is found with 500-1200 CC/min in a high boost(1 bar or greater) application. I think that the SU23, if it flows as advertised, should be the best fit to put me right in the proverbial "sweet spot" at roughly 725 CC/min at 20 PSI boost. Keep in mind most of these tests were conducted using straight Meth or a 50/50 mix.

Keep in mind I do plan on using a 50/50 mix water/methanol.

BTW, have not seen any updates on your build progress lately, anxious to see some numbers and curious as to what RPM you are seeing 1 bar of boost at with the 62.

 

hahahahaha oh ****, ahhh I love a good laugh in the morning

 

We're figuring 300 to 500cc/min for most street cars (that can fire it) and upwards of 700 and slightly higher for mega high power stuff like rx72c's setup.

B

 

The only thing stopping me right now from any progress is the nozzle itself, I have an sue18 (380cc @20psi) nozzle and it's not flowing anywhere near what I need it to (300cc @ 20psi) and I'd rather find another option then try drilling it that's for sure. The sue23 nozzle seems like it should flow enough, but again I'm worried about the droplet size of a nozzle it's size and low boost.

 

I hear that. Like I said in a previous post, the SU23 is advertised at 445 CC/min at 12 PSI.
With that output at a relatively "low" operating pressure I can only guesstimate that the atomization is gonna be good if not excellent.
My plans are to hook my solenoid up to an output of my Haltech and have the EMS trigger the solenoid at 10 PSI

 

Ill probably call in and see if i can get this changed out.

 

Thanks for the heads up Brian! Just got the time to read your modes of action and efficacy thread and I have a burning question:

Do you feel that approximately 700 CC/min @ 20 PSI with a 50/50 mix would be excessive ?

 

Two answers, Woogie:

1) I honestly don't know. I've little practical experience with water... for now.

2) A 50/50 mix can't be done with a "single stage" (or static) setup where the AI system just sprays a flat amount since the 50% of alcohol in that affects wideband readings. A 50/50 or all alcohol setup would need to be really done w/ a progressive system.

B

 

Or a mechanical system which is progressive due to the nature of the design. Another option would be to tune for the 50/50 mix. I don't think 700cc is excessive for 50/50. Injection systems are pretty flexible on the amount you can inject. Atomizing plays a role in the maximum amount you can inject, as well as a good ignition system.

 

And what in your eyes is a 'good' ignition system for a projected 725cc/min of water?

 

Any update? Do you have the nozzle yet. Hopefully it's like all the other nozzles and flows less than advertised, then it'd be perfect.

 

One that will fire the mixture without ignition breakup. I'm running an HKS twin power, iridium race plugs, stock coils and 10mm wires. There are much better systems out there, but mine works for me.

 

That's pretty much identical to mine, given your setup do you think it'll be able to fire ~750cc @ 20psi?

 

Provided everything is in good condition and you don't run excessively rich I think it should fire it. Others have had trouble getting the twin power to fire water injection mixtures, but I have no idea their plugs or tuning. Preturbo also has better atomizing effects over post turbo, this makes it easier to ignite.

 

Also keep in mind that injecting pre-turbo will exhaust some of the atomizing (liquid) water that would have to be fired in the chamber in the first place since some of it is being used to pull heat out of the compressor. (Ergo, this may be a reason for doing a higher volumetric injection amount in front of the turbo when using only that spot on the engine to inject water).

B

 

Update:

Prior to water injection I was seeing 10.9-11.0 AFRs @15psi... WITH water injection I am seeing 10.4-10.5 AFRs. Now I was under the impression the WI shouldnt change AFRs, at least not to that extent.

I went out and did back to back pulls with and without WI and the results were the same in terms of change in AFRs.

I tapped the hotside intercooler pipe for the 'pressure source' that T's and feeds the nozzle and the water tank. The pressure solenoid has it's own line going straight to the intake manifold.

Does anyone have any clue what is going on here?