Quick question? I'm getting my parts together for my DIY IC Sprayer and was wondering if a timed relay was needed. I have a USDM IC sprayer button on they way and I wasn't sure if the switch was already set up so that upon pressing it it will give an electrical signal for x seconds or if I needed a timed relay to accomplish this. I was leaning towards getting a timed relay but wanted someones input before I did so. Also if I do need a timed relay what type are you guys using? Thanks in advance for any replies

No one? Maybe this has been answered already. I did alot of searching but didn't see anything addressing this specifically. I'm not the best a wiring...

I have no experience with it, but I'd venture to guess it's a momentary switch. You could also look into a boost activated switch. In the long run, I'm sure it'd piss away ALOT of fluid, but for race type scenarios....it may prove somewhat beneficial. Just another route. I was thinking of doing it for my Escort, but that car took to the sidelines once I got the wrx. Here's a link tot he one I know of
http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=tp&Product_Code=ATP-BCS-003

chris

The USDM IC switch does have a delay. I don't remember how may seconds it runs the pump as I hardly use it.

cool thats what i needed to know...appreciate it

The USDM IC switch does have a delay. I don't remember how may seconds it runs the pump as I hardly use it.

i know i might be thread jacking,
but, webfoot, are you thinking of selling the wire harness for your spray kit?

What kit? I'm OEM.

The stock STi intercooler spray switch doesn't have a delay built in... You need to order the spray timer assembly (part#88017FE040) from Subaru to get the 3 second spray. If you install the switch without the timer assembly, it will only spray while you hold the button down.. Hope this helps!

Thanks, I just picked up a regular relay w/o a timer. Couldn't find a timed one at Lowes/Home Depot so I guess I'm just gonna have to leave my finger on for that 3 seconds!

A boost pressure switch(like from coolingmist) would work better IMHO than a time delay relay. You can parallel a momentary switch with the boost switch to activate the sprayer when you want to(like during stop & go driving to cool off heatsoak) but allow the pressure switch to control the pump based on boost pressure. I'd also series in a maintained switch to prevent the system from working when you don't want it to work.

Screw the Subaru part, get an DEI 528T adjustable timed relay. It will wire in exactly as a regular relay does...not to mention it will be cheaper.

I still have a schematic for a previous setup I had. I had a manual USDM IC Spray switch, and an JDM Auto IC Spray switch wired through a boost pressure switch. It was just a bit much, and took up too many spaces on the dash.

The problem is, you actually overspray with a boost switch unless you set it near your peak boost. Evaporation will cool better than a layer of water. Something containing alcohol will cool even better, since it will evaporate faster.

Here is stock STI with a JDM button and pressure switch added:

http://i134.photobucket.com/albums/q90/aboothman/Car/togglejdm.jpg

Here is my setup with a relay:

http://i134.photobucket.com/albums/q90/aboothman/Car/ICSprayerSetup.jpg

The problem is, you actually overspray with a boost switch unless you set it near your peak boost. Evaporation will cool better than a layer of water. Something containing alcohol will cool even better, since it will evaporate faster.

You are right & wrong. The water will actually remove more heat than alcohol per unit, but the alcohol will evaporate faster.

Using a better mister nozzle, more like for meth injection style you'll get better atomization of the water = better evaporation = better cooling, however that make require a different pump.

Many of the turbos need to taper boost to redline anyways, set the pressure switch above 'redline' boost & you'll have enough water on the IC to by the end of the run not to worry about over spraying.

HAHA ok...well I can't even get it to work with just a regular relay, maybe you can help me. Heres what i got for a relay

http://i25.photobucket.com/albums/c69/RWSchober/DSC01049.jpg

Right now I have 1 and 2 going to the positive and ground directly to the battery. (Which one is positive and ground shouldn't matter correct?) I have 4 wired to the switched power out of my IC switch from the dash and I have 5 going to the positive on my pump. ( I checked the pump and it works when connecting directly to battery.) This is a no go. I have the switch grounded directly to the battery and I have tapped into the violet and orange/white wires off the fog lamps to get the switch power. The only other thing I tried was grounding the switch to the relay on 4 and having the positive wire from the pump on the relay at 5. Sorry if this is confusing but any help anyone could provide would be great. Maybe once I get this going I can wire in a boost switch as well in series with another switch.

Oh yeah and the light on the switch lights up when i turn the key on so I know thats working OK

http://i25.photobucket.com/albums/c69/RWSchober/DSC01049.jpg

Right now I have 1 and 2 going to the positive and ground directly to the battery. (Which one is positive and ground shouldn't matter correct?)

Negative goes on 1, you've got a diode before the coil on the diagram. Positive on 2.

Ok i'll try that...thanks

Ok...i'm really kinda frustrated now but maybe one more person can chime in before i go insane. Do i need positive power directly from the battery going to the coil on the relay (1 and two) to keep the coil constantly energized? I would have the switch running its positive power to 4 to trigger the relay and the positive on the pump going to either 3 or 5? The other way I tried it was having the switch energize 1 and 2 and having the pump run off 3 and 5? I'm really confused at this point. Also is it a possibility that I got a faulty switch. I put a multimeter across 3 and 5 with the switch illuminated so I know it has power and when I pushed it I didn't get any current. Any more help would be appreciated, I know i'm asking dumb question and being a pain in the butt but I'm stumped at this point.

The coil of the relay (1 & 2) needs the IC sprayer switch wired to it. The contacts (3 & 4) need the 'fused' direct battery voltage to it & the pump.

3 is your common, 4 is Normally Open(open when de-energized), 5 is Normally Closed(closed when de-energized).

switched +12v(like the clock or radio) thru the 'IC Sprayer switch' to the #2 contact of the relay, #1 is grounded.

#3 has +12v fused direct battery power. #4 has one of the wire on the pump hooked up to it, the other wire on the pump needs to be grounded.

sweet thanks soo much thats exactly what i needed. I'll let you know tomorrow when I get it working

Couldn't get it to work. Relay works fine as I hooked it up directly to power and would hear it click. The switch was getting power from the wires I spliced into on the fog lamp harness b/c it would light up when I flipped on my lights. The pump works fine as well. I'm not sure if I got a faulty switch or not b/c when i tested the two connectors with a multimeter when I pushed the button I didn't get any voltage. I'm stumped for now. I undid most of the wires and I'm gonna start from scratch with a fresh mind next weekend. Kinda pissed off right now b/c what should have been a simple job took too long with no results. Thanks for all the help though.

Just ordered a DEI timed relay too. Figured that if I was gonna wait until next weekend I mine as well take my time and get the better relay. Other one is back to Autozone

Just wanted to thank you guys that helped me out. Got it wired up today and everything works great. No problems this time. Guess sitting for a week helped me out. Thanks again.
http://i25.photobucket.com/albums/c69/RWSchober/DSC01064.jpg
http://i25.photobucket.com/albums/c69/RWSchober/DSC01062.jpg
http://i25.photobucket.com/albums/c69/RWSchober/DSC01063.jpg
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