water injection installation questions

[Thealastair34]

hi all,

im wanting to run water injection in my engine to help lower inlet temps, as you can see i am very limited to space and have the largest intercooler i could sort of fit within the bodywork.

i am new to this and have won a snow performace stage 2 kit from eBay that i am waiting to arrive.

it has no nozzles with it so i need to get some but need to know how you spec them for the engine?

also im not sure if its a single or dual nozzle kit are there benifits to running say two nozzles?

any help would be great as like i say ive not dabbled with water injection before

pic of my current engine setup and of car attached

http://i64.photobucket.com/albums/h161/wideka/vw%20stuff/ec95d65ccda1c8fed25e24ffd1877442.jpg

http://i64.photobucket.com/albums/h161/wideka/vw%20stuff/4c633ebbede026671e1a77f3311f2678.jpg

thanks alastair

[Richard L]

1cc/min per hp is a good starting point.

Does the system spray in relationship to fuel flow or boost?

[Thealastair34]

Hi

By boost pressure, will check when it arrives though

[Richard L]

I believe the snow system is pump speed system, ie the flow is weighed at the lower half of the flow range. You may need to starting point quite late on your boost range or risk over spraying at low load and RPM.

Please update.

[stevieturbo]

The IC itself certainly isnt small. What are intake temps at present ?

[Thealastair34]

Hi,

Recived the kit, it has a controller which you set for when it starts to spray at minimum boost level you want and it does 10% at that psi, you also set for peak boost which the nozzle then is at 100%

Regards inlet temps, thre allways a known problem on kit cars, it not been on the road just had a couple of runs on be dyno, had 10 degrees ambient, inlet temps rose to 25 during one power run with no bodywork fitted and fan pushed up against intercooler.

Speaking to the guys on the rollers they said that they have fitted to the hot side of the inercoolers the nozzle, what are your thoughts on this?

Steve, saves me posting on passion ford if your on here too, thanks for your help

Alastair

[stevieturbo]

Intake charge temps of 25degC on boost with 20psi are nothing to be even remotely concerned about.
In fact, many would be pleased with that.

If you're injecting water, I would not be injecting it before the intercooler.

[Howerton Engineering]

Yes, your inlet temps do not seem excessive at this point. If using straight water, you can inject a small amount either on the outlet of the IC, or a small amount into the turbo.

The issue with the controller you have and a smaller jet is the system will probably not work as advertised. The pumps are so oversize compared to the jets, the unit will probably come on at 50% or more and ramp up very quickly. If using a smaller jet, say M5 or smaller, it will act similar to an on/off system.

I'm not trying to put down the system, just be ready for it when you begin to tune with it.

[stevieturbo]

The big pump systems are more intended for high HP usage really, where large volumes of water/meth are required and desired.

You can set the controller to come on at say 10psi and not reach max until say 30-40psi. At least then the pump itself will never run flat out when using only 20psi, which will mean reduced flow.

[Howerton Engineering]

Yes, you can cheat the system that way to make it work a bit more linear.

[Thealastair34]

Intake charge temps of 25degC on boost with 20psi are nothing to be even remotely concerned about.
In fact, many would be pleased with that.

If you're injecting water, I would not be injecting it before the intercooler.

My concern is that this is based on one power run on the rollers with good cold air feed, not on the road with the bodywork on. I doubt it will be that low on the road

Why is the hot side of the intercooler considered bad in terms of injection?

[stevieturbo]

A large part of the theory behind water injection is that some of the water will get evenly distributed into the cylinders to cool the chamber and suppress detonation.

Spraying before the IC means that is unlikely to happen. If charge temps are cool, you'll just fill the IC core with water.
If they are hot...the water may boil off....then possibly re condense inside the IC core.

Neither are ideal scenarios.

You really need to establish actual charge temps first before worrying too much. And also find out exactly what your CR is.