looking at fitting this to my hawkeye wrx and looking for some pics or diagrams to see how they wired it up

cheers tom

 

I used this on my bugeye but it should be the same,where it says timer i use a relay.
http://forums.nasioc.com/forums/show....php?t=1976585

 

The manual spray as per uk is just a gimmick really as it needs you to know when it is required whereas the jdm auto spray does all this for you. Gets through water quickly as well.

 

And the ECU doesnt support auto i/c on anything but a JDM STI

Tony

 

cheers lads,

im only wanting to install it so if i do have a hard drive it will allow the temps to come down a bit quicker thats all,

bugeye john would any type of relay do it

 

Yeh just a standard 4 pin

 

As mentioned the manual IC spray is a bit of a gimmick but you can always rig up a timer to fire the intercooler spray at set intervals, I am in the process of fitting this to mine. Fires once every 15sec ( although timing is variable ) and armed via a simple switch.

You can then concentrate on driving hard and not worry about pressing a button.

I'm using this circuit for the timer
http://www.rapidonline.com/Education...73837/kw/mk111

 

Every 15 seconds & it'l be empty in 10mins!! lol

 

Yeah with the standard inefficient water jet which is nothing more than a windscreen washer jet.

Switching to a misting jet setup improves water use considerably and gives much better cooling capacity.

Spray interval can be adjusted from constant to every 60s so a balance between water use and cooling capacity can be found, all via the dash mounted control.

 

I would not bother with a timer personnally, I have a boost pressure switch from RS components, adjustable to switch between 3-15 psi. You can have it pull the reylay in as soon as you make, say 10 psi boost.
Alternativly i could use my ecu to pull the reylay in above a certain air temp and/or boost pressure (configurable outputs)

 

The standard system is run by boost pressure and activated by the STI ECU as mentioned. You can get after market boost activated systems.

http://cgi.ebay.co.uk/ws/eBayISAPI.d...84.m1423.l2649

 

Is that what you have?

 

nope, the rs components switch is much smaller and only £15 odd

 

I would rather have a boost activated system like the standard system personally. You can just buy a boost switch and a few relays and make a system yourself, but the correct boost pressure switch is very hard to find. Almost works out cheaper and easier to buy the ebay kit.

 

Boost trigger wont help with heat soak when off boost though. A timer based system will still spray the intercooler when off boost helping to keep temps down as the boost builds.

Yes the standard system is operated by boost but doesnt automatically mean its the best or most effective way.

 

The standard set up has a manual override as well as the boost switch but unless the air is moving through the intercooler spraying water on it won't do a lot.

An intercooler spray is something i'd like to do sometime so i'm finding this thread very useful.

Has anyone fitted a fan to an intercooler? After all it is just another radiator of sorts?

 

I had my a JDM auto spray switch wired in with a hobbs pressure switch attached which would start spraying at a preset boost level. Standard manual switch was left in so I could get a squirt anytime I wanted.

Now I just let my SimTek do it.

 

Yes a regular spray isnt going to do much without lots of air flow through the intercooler but a fine mist spray will help as the surface area of the mist is so much bigger.

A fan is a good idea, I've calibrated a similar system on some Ford diesels and it seems to work reasonably well. Would be an interesting experiment on the Impreza. A mist spray and fan would be good.

 

A bike fan or two would do the job nicely I reckon.

Mounted underneath and sucking air in.

Just found this.

https://www.scoobynet.com/projects-4...oler-fans.html

 

Its not just boost that it triggers on, its also inlet temps etc, hence why the ecu controls it though some of the aftermarket systems may be able to do similar.
The best example is in cold conditions you use virtually nothing, in warm ambient temps ive used an entire tank (12ltrs) in 400ish miles

Tony

 

Heres a thread on running of boost if anybody needs it.
http://www.iwsti.com/forums/how-inst...eferenced.html

 

I agree. Ideally boost switch and temperature switch would be ideal. Can certainly rig 2 switches up in parallel to trigger on either boost or temp and fit a timer relay to control the time. Shouldn’t be too difficult. Will need to fit a boost temp sensor in one of the boost hoses as well.

Also fitting a manual override switch should be easy enough.

 

I can get the RS part number of an adjustable pressure switch (3psi to 15 psi) if anyone is interested?
Im strongly considering intercooler water spray, either with my pressure switch as control or controlled with my ecu using air temp as a trigger

 

Might be interested in that and the cost. But am running 1.4bar so 21 ish PSI, so would need a larger range switch.

Thanks. Andy

 

would you not want it to switch on at a lower boost than 15psi? i am gong to set mine at around 10, im running 21 psi boost.

 

I would indeed. Probably at 15 PSI for me. But I would always want to specify a switch that had a working range in excess of your selected boost. You don’t want to be driving a 15 PSI switch with 21 PSI and causing problems or damage.

Ideally I would want one with a range somewhere near 0.3 bar – 2 bar.

 

I dont quite see your point, it is the switching point you can adjust not the maximum operating pressure.
For example you could switch it at 3 psi and it will remain on all the way upto the maximum boost you are running, 30 psi or whatever.
In the same instance you could adjust it and have it switch at 15 psi (not really wise tbh) and have it remain on up until 30 psi (if you had supporting mods)
I personnally will switch it lower in the boost, as when accelerating, at peak torque, the point at which peak boost is first made, there will allready be water being sprayed on the cooler, due to it being switched on at a lower boost level.

 

Do what you like mate, your car. Only trying to help.

 

Im not dissagreeing with you i was trying to educate you as it appeared that you were a little lost with how an adjustable pressure switch works, it doesnt explode after switching on if the boost continues to rise lol, mate

 

Hahaha. Right mate! As an electrical engineer who designs safety systems and sensors every day I appreciate your help very much!