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Old 08-07-2007, 07:51 AM   #1
Sausage
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Default STi people, when do you use the IC spary button?

I want to rig up an IC spray system on a wrx, but rather then just having a button, I want the spray to come on automatically.

but when is it supposed to spray? When you shift into first, when WOT it? Or just whenever the hell you feel like pressing the button?

thanks
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Old 08-07-2007, 07:53 AM   #2
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PS: sorry for the early morning dyslexia in the title, any bored mods, fix it for me?
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Old 08-07-2007, 08:40 AM   #3
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I have not done this, but my early morning two cents. You might be able to rig up system using a methanol injection controller. You could set this to the boost level you want the spary to start. More than likely you will have to by-pass the OEM pump and use the one that came with the injection kit by splicing into the spray line, preferably at the source.
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Old 08-07-2007, 08:46 AM   #4
Sausage
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^ it doesn't sound like a bad idea, but I first need to know when STI drivers usually press the IC spray button, or is theirs automatic?

The switch seems out of the way and looks like it's meant to be used casually.
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Old 08-07-2007, 08:50 AM   #5
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It's not automatic
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Old 08-07-2007, 08:50 AM   #6
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there are a few ways to go.
since heat soak is most likely to occur while you are not moving
(no air moving through scoop & intercooler)
lots of people spray while at traffic lights, in between track runs, etc.

there is also a great pressure switch set-up that is boost triggered.
it uses the JDM style switch as a master on/off for the boost pressure spray system.
you can keep your USDM switch as a momentary spray.

because I am swell, here is the link.
http://www.iwsti.com/forums/showthread.php?t=39827
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Old 08-07-2007, 08:54 AM   #7
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^ nice thanks!
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Old 08-07-2007, 08:58 AM   #8
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I wasn't sure if the spray system was meant to help with heat soak at lights and traffic or if it sprayed during a hard run to keep the IC cool and intake temps down
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Old 08-07-2007, 09:01 AM   #9
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i start spraying when i wake up in the morning... and stop spraying when i go to sleep. hahahaha... but no really. since we're in texas, and if ur lookin' for speed or that lil bit extra, just hit the button constantly until u start driving. the good thing about our intercoolers are that they are VERY efficient at cooling down. yes... they're not very big, but they do a great job.

--J
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Old 08-07-2007, 09:01 AM   #10
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glad to help.
you can source the switch through ebay.
or an electronic parts supply house like mouser.com

I have all the parts to do mine, but I bought a house, so all of my projects are indoors for a while.
at least until I get the mountain of boxes out of the garage!
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Old 08-07-2007, 09:02 AM   #11
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after sitting in traffic, I spray
before nailing it onto the highway, I spray
the short straights between the corners on my back roads, I spray
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Old 08-07-2007, 09:19 AM   #12
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Quote:
Originally Posted by ekw View Post
there are a few ways to go.
since heat soak is most likely to occur while you are not moving
(no air moving through scoop & intercooler)
lots of people spray while at traffic lights, in between track runs, etc.

there is also a great pressure switch set-up that is boost triggered.
it uses the JDM style switch as a master on/off for the boost pressure spray system.
you can keep your USDM switch as a momentary spray.

because I am swell, here is the link.
http://www.iwsti.com/forums/showthread.php?t=39827
Very cool - beats the crap out of my my idea.
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Old 08-07-2007, 09:25 AM   #13
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I have mine setup to spray when i am at 5psi or above. I can also spray it on demand, like when i am sitting in traffic and staging for a lap.

At 5psi I use about 1 gallon of water in a 20 minute track session.
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Old 08-07-2007, 09:43 AM   #14
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I have a sprayer? j/k
No need in the winter, mostly just before I pass someone (which is often ) and when I'm on the backroads after 70+. I think I should use it more, but I always forget about it. The new STi needs an automatic setting for summer driving. When it gets to a high rpm it should spray by itself.
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Old 08-07-2007, 10:06 AM   #15
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Cool, now another question

Where is your water reservoir located? I'm trying to find a way to fit it in the engine bay and not use the windshield reservoir. I don't want to put it in the trunk since I have a wagon. Is yours in the fender or under the front bumper or something?
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Old 08-07-2007, 10:40 AM   #16
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Quote:
Originally Posted by stickygerbils View Post
I have a sprayer? j/k
No need in the winter, mostly just before I pass someone (which is often ) and when I'm on the backroads after 70+. I think I should use it more, but I always forget about it. The new STi needs an automatic setting for summer driving. When it gets to a high rpm it should spray by itself.


There's no reason you can't do that yourself. Costs around $40 to do the boost referenced one, can't be too much more for an RPM referenced one.
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Old 08-07-2007, 02:10 PM   #17
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mine sprays at 50% throttle, or when i manually spray it.
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Old 08-07-2007, 03:42 PM   #18
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alright, I got an EE to help me out and we're gonna come up with a temperature activated system. So...any guesses at what temps the spray should be activated?
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Old 08-07-2007, 03:51 PM   #19
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I think you need to figure that our for yourself. Set it at a point that controls heat, but does not spray too much water.

Trial an error.





Problem with your idea is that it will need to spray intermittently, otherwise it will just cover the IC with water when you are stopped at a light and soaked. That is when it is very inefficient to be spraying constantly. That can actually add to heat soak. Boost or RPM referenced is the best bet.
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Old 08-07-2007, 03:59 PM   #20
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i did the pressure activated setup, it works.


I usually spray it when sitting at a light before it turns green, and when merging or passing but the auto mode take care of that for me now
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Old 08-07-2007, 04:02 PM   #21
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@12psi
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Old 08-07-2007, 04:25 PM   #22
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imho by that point its too late
you need to be able to spray it before you boost for its gains to be truely effective, other wise your not changing the heatsoak condition at all
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Old 08-07-2007, 04:26 PM   #23
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imho by that point its too late
you need to be able to spray it before you boost for its gains to be truely effective, other wise you're not changing the heatsoak condition at all
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Old 08-07-2007, 04:33 PM   #24
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My understanding is as such: It should spray when the IC is hot. If you are already moving more than 20-30 mph, it's already gonna be about as cool as it is gonna get though. Aluminum transfers heat quite efficiently. I use mine after sitting at a light for a while, just prior to accelerating.
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Old 08-07-2007, 04:40 PM   #25
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Quote:
Originally Posted by STiShawn View Post
imho by that point its too late
you need to be able to spray it before you boost for its gains to be truely effective, other wise you're not changing the heatsoak condition at all
If you are heat soked and you need to, you do it manually. ie at a stop light. I have it at 12 psi so that it's not constatly spraying and so that it only does when I'm driving aggressively.
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