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Old 07-10-2003, 10:37 PM   #1
STi-ll chillin'
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Question Auto i/c spray system?

I think I read somewhere that the EVO has an automatic intercooler water spray system. It automatically sprays water on the i/c when it senses a programed temp.
Is that you guys have heard/read?

Is any aftermarket company making a system like this for our STi's?
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Old 07-10-2003, 10:47 PM   #2
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Default Re: Auto i/c spray system?

Quote:
Originally posted by STi-ll chillin'
I think I read somewhere that the EVO has an automatic intercooler water spray system. It automatically sprays water on the i/c when it senses a programed temp.
Is that you guys have heard/read?

Is any aftermarket company making a system like this for our STi's?
Automatic Spray on the Evo sprays.. Every 5 seconds for 3 seconds i belive!!!

I'm sure there is a system like this for the STi!!! Or for any intercooler as a mater of fact...
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Old 07-11-2003, 02:55 AM   #3
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I just purchased one from Autospeed in Australia, works of the temperasture diffedrential of the intercooler & ambiant air temperture and duty cycle of the injectors.

Should have it installed in a week.

http://www.autospeed.com/cms/article.html?&A=0527

regards, NIgel
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Old 07-11-2003, 03:12 AM   #4
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I have mine hooked up to SECS unit, it goes on at a preset boost so I only use water when driving with some throttle, if it were by temp I'd be afraid that whenever it was hot the tank would drain even if I'm just cruising across town or something. Mine is set for ~3psi
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Old 07-11-2003, 04:43 AM   #5
WRX 2002
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Quote:
Originally posted by StealthWagon
I have mine hooked up to SECS unit, it goes on at a preset boost so I only use water when driving with some throttle, if it were by temp I'd be afraid that whenever it was hot the tank would drain even if I'm just cruising across town or something. Mine is set for ~3psi
Which wire did you use to trigger the spray pump...?.

N.
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Old 07-11-2003, 06:21 AM   #6
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a little off topic, but when should we be spraying the intercooler? hence, our current setup is for us to manually spray the intercooler, when should this been done? thanks.
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Old 07-11-2003, 10:21 AM   #7
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Default WRX 2002

How much does it cost? I did no see any price on the web site.
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Old 07-11-2003, 11:44 AM   #8
WRX 2002
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Its $A220 or approx USD145. Shipping is free to an Australian address or around US35 to the US.

I had it shipped to a friends home and picked up in Japan. Its a well build system, I just hope it works as well as it looks.

N
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Old 07-11-2003, 01:38 PM   #9
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Quote:
Originally posted by STI 2 NV
a little off topic, but when should we be spraying the intercooler? hence, our current setup is for us to manually spray the intercooler, when should this been done? thanks.
An old thread addressed this issue. Since intercoolers are effectively heat sinks, you want to use the spray before you begin to accelerate, if you are moving. If you are in stop and go traffic, you should use it as much as possible, since little airflow is passing the IC. The problem with temperature based controllers is that they spray after the WOT run that causes heating of the IC. The best concept I have heard so far would be to link it to the electronic throttle, so anytime the pedal is pushed past 2/3 or 3/4 throttle it automatically sprays.

I am a mechanical engineer, so I am incompetent when it comes to electronics and controls. Could an electrical figure this out for us?
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Old 07-11-2003, 01:54 PM   #10
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I think the best option would be a thumb or finger switch on the steering wheel. I'm sure it wouldn't be difficult to set something up, but it would be nice to have something cleanly installed, and mostly out of sight. Now that we're in the middle of a heat wave in Colorado, I have been using it mostly in stop and go traffic and a few times just before I know when I'll get out on the open road. I'm not sure there is an automatic system out there that would be better than one that is easily enabled by the driver from the steering wheel without moving their hands.

TRS

Last edited by ToddStratton; 07-11-2003 at 02:02 PM.
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Old 07-11-2003, 02:27 PM   #11
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Default Electrical

I am an electrical engineer and could give it a go. But I would need to get a hold of an electrical schematic of the throttle control system.
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Old 07-11-2003, 10:05 PM   #12
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Thumbs up HEY Burke and WRX2002

Hey WRX 2002, thanks for the info on the auto i/c system! I think I'll purchase one.

And Burke, dude if you can figure a way to wire it into the trottle at a preset trottle position(80%, 85% ???) that would be awesome. I agree with you that would be the perfect way to get the spray to come on automatically. Do you think if it came on at 80% trottle it would be too late to take full advantage of the cooling effect?
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Old 07-12-2003, 10:56 AM   #13
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Pressure switch, tap into boost gauge line to detect. Set at 8-10 psi. Tap wiring from switch into sprayer motor. Turbo boosts over your settings, motor will spray water on intercooler. Switch cost, approx. $30.

RN
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Old 07-12-2003, 11:26 AM   #14
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Default Changed my mind

After reading all the info on that Aussie speedshop's website(see above link) I think that just tapping into the trottle or boost pressure to actuate an auto spray system is NOT the way to go.
Read their tech articles
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Old 07-12-2003, 11:38 AM   #15
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Default Re: Changed my mind

Quote:
Originally posted by STi-ll chillin'
After reading all the info on that Aussie speedshop's website(see above link) I think that just tapping into the trottle or boost pressure to actuate an auto spray system is NOT the way to go.
Read their tech articles
That all depends on how you intend to drive and use it and on how you set it up. The person who told me how to do that has found it QUITE hepful on his and for my application, it is looking to be the best, cheap option, especially given I'd add a small, secondary water tank.

RN
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Old 07-12-2003, 03:34 PM   #16
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Tapping boost pressure is supposed to be a really simple addition if you have a PSI3 SECS unit, since it has a user-programmable trigger based on boost. I'm not convinced that boost pressure alone is the right answer though -- do we really want water spraying continuously on a long straight in a road course? In 40F degree weather? I suppose since the injection control is programmable I could just use my brain to turn it off in completely inappropriate conditions (e.g. winter), but that still leaves the track.

I still haven't gotten any answer about how legal this is for autocross classes. I can read the stock rules (using 13.10.I) as allowing it, but I doubt that would stand. Arguably SP, SM, and even in Prepared it is illegal to even have the system, but that also doesn't really make sense (especially given other rules which would say it is illegal to remove it, but also illegal to have it). The problem is that the rules say that you can't do anything which isn't listed, but water sprayers are not allowed (explicitly disallowed in fact), so of course no class rules say anything about them at all. Most competitors either hate the sheer audacity of having one (and complain about the Evo and STi being cheater cars), or think having a sprayer is really cool and so could care less about the rules -- they just want to press the button! Maybe I should email Howard Duncan.
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Old 07-12-2003, 03:56 PM   #17
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Quote:
Originally posted by WRX_Mundi
Tapping boost pressure is supposed to be a really simple addition if you have a PSI3 SECS unit, since it has a user-programmable trigger based on boost. I'm not convinced that boost pressure alone is the right answer though -- do we really want water spraying continuously on a long straight in a road course? In 40F degree weather? I suppose since the injection control is programmable I could just use my brain to turn it off in completely inappropriate conditions (e.g. winter), but that still leaves the track.

I still haven't gotten any answer about how legal this is for autocross classes. I can read the stock rules (using 13.10.I) as allowing it, but I doubt that would stand. Arguably SP, SM, and even in Prepared it is illegal to even have the system, but that also doesn't really make sense (especially given other rules which would say it is illegal to remove it, but also illegal to have it). The problem is that the rules say that you can't do anything which isn't listed, but water sprayers are not allowed (explicitly disallowed in fact), so of course no class rules say anything about them at all. Most competitors either hate the sheer audacity of having one (and complain about the Evo and STi being cheater cars), or think having a sprayer is really cool and so could care less about the rules -- they just want to press the button! Maybe I should email Howard Duncan.
Most people think to include an on/off arming switch for the automated system. I know I will.

RN
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Old 07-12-2003, 11:38 PM   #18
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Default EVO

The EVO is a timed interval spray that you can turn on and off. The interval is controlled by the brain. Personnally when I found that out I thought that was the best option. You need the water to evaporate before it starts to cool so spraying at the boost time could just be wasting water if you are boosting all the time. The system I am thinking of making would be a timed system contolled by the user (potentiometer) that you could adjust on and off. That way you could set it to spray only after the last spray has mostly evaporated. Ideally there would be a temperature sensor on the intercooler and a relative humidity sensor as well to determine the proper evaporation rate but hey lets start simple.
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Old 07-24-2003, 10:47 PM   #19
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MRT-rally sells a very good unit, I have one on my RS-T
Its a couple hundred bucks.
It triggers the pump, from engine temp, boost pressure, and intake temperature, all 3 triggers have to be activated.

You can adjust the thresholds manually, and use the unit as a digital boost display, or an intake-temperature display.

Its fun watching the intake temperature go up when the boost comes on, then go down again, after the spray kicks in.
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Old 07-25-2003, 11:23 AM   #20
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I developed my own ambient vs. core temp controller a while back. I have a post over on imprezawrxsti.com somewhere with pictures and functional details.

I ended up being hospitalized during the development and I've never really picked it back up. I'll play with the prototype and see how well it works. If it does alright and people are interested, I could see having a functional unit for less than $50.

EDIT: Here's the link. Obviously a development part would look much better than this one!

http://www.imprezawrxsti.com/postnuk...b6e4d15d0102fe
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Old 07-25-2003, 06:17 PM   #21
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Why not get the sti tank with the motor, pump, and level monitor and mount it in the trunk. Then monitor the input side metal mass temperature of the TMIC with an LCD thermometer from Walmart (it also records maximum and minimum temps) and gives the in-car temperature.

I have seen the inside temperature a lot higher than the IC temperature when the greenhouse effect is strong. When the IC temp is low (ambient or body temperature, or 111 deg F, etc) it's all OK, if it heads to 130 to 160 F with many heat Kcal stored, then I hit the sti manual switch which looks stock. At least thats the way is in my modified 2002 Wrx.

I run through more than a gallon of distilled water a week (50 cents at Walmart). I get about 52 10 second bursts out of 6 quarts of water. I find it useful for getting rid of heat soak after running the car hard and then having parked it in the sun for about 20 minutes. I have a set up to monitor IC temp with the engine off since the T monitor has internal batteries, and I can spray with the engine off as long as I hold the switch in. The circuit is just a 30 amp protected 12 guage wire to the sti switch and from the switch to the hot side of the sti pump motor. The motor is grounded to the trunk through attachment bolts next to the jack compartment. Double stick tape also secures the bottom of the tank to the metal trunk floor. Wires and hoses are taped down to prevent movement. From there they go under the rear seat and under the inner plastic sill to go through the rubber plug between the clutch and brake pedals. They are siliconed in place in the center of the firewall plug.

The switch location is to the right of the cruise control button. It's a bare bones approach that goes well with a lightened trunk, light weight exhaust and a discarded stock splitter assembly.

Since I have the TXS TMIC which is twice the volume of the stock wrx IC, I made an inexpensive "duct" out off closed cell PE foam insulation. A single Sti nozzle is mounted in the middle (I have 3 more, but I don't see the need for more nozzles right now). I also run the silicone water hose through it to keep the line cool and to hide it.

This is a bare-bones lightweight Sti system. Almost all of the weight is kept in the trunk.

I don't even have to look at the temperature data files on the UTEC. I also see no need to use the capabilitiy of the UTEC to control the spay. I see everything I need in real-time and use the Sti manual switch as I see fit, which includes preparation for an intense WOT run from a stop. Or to speed cool down after a massive heat soaking with the the engine off in a sun-baked parking lot. You can also see what air alone does to cool the IC at idle, or at speed when you lay off the boost.

I plan on adding another temp monitor to the cool side output, which relates directly to intake temp, which should respond faster to spray effects than the hot side (turbo output/thermal mass/conduction) readings. Of course, to be meaningful the cool side sensor has to be isolated from the incoming air and spray.

I can also get data via the UTEC, but it's cumbersome in real-time driving.
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