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Old 07-19-2012, 05:31 AM   #1
02CWRX
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Default JDM Auto Intercooler Sprayer Questions

Ok, so I would like to install an auto intercooler sprayer in my car. I am wondering who is familiar with how the system operates in a JDM car. It seems the JDM cars have two switches possibly, one that is the same as the USDM cars, then a second that is the auto function switch - at least, that's what I'm getting based on the importers who sell the switches and tanks as a set. Is this correct, or is it just the one switch? A wiring diagram would answer this question too I would think.

EDIT - Wiring diagrams confirm two switches in JDM cars. One for manual mode which activates the spray timer, and one for auto mode which re-activates the spray timer when the ECU parameters are met.

That in mind, does anyone know the ECU pinouts for the system interface? I know the JDM ECU has mapping for the system to activate it, I assume it just uses the sensors the engine already has and not extra sensors somewhere, correct? Looking at the ROM, there are thresholds for the auto system to activate when placed into auto mode based on manifold relative pressure, engine coolant temperature, engine speed, vehicle speed, and intake air temp. When I do my system, I would like to use this capability in auto mode.

EDIT - Wiring diagrams indicate it is true the ECU controls the spray by basically re-activating the manual circuit, and shows an interface with the ECU.

Third. Does anyone know if ALL the STi clusters have the low water level light? If so, does anyone know the pinouts for the cluster to incorporate that into the mix? I noticed that looking at the tanks that are supposedly from V7 cars they have low level sensors. I assume this would connect to a light on the dash like new cars, and since I have a V7 cluster, I would think it might have it - I just have never seen it during the lamp check during key on self test or any other time.

EDIT - Looked through the documentation for the V7 STi cluster and found that the "I/C Spray" light uses pin B5 in the center plug (i11) of the cluster. Grounding this pin does in fact illuminate the light. This is the same wire used as the A/T temp light in non-STi cars (autos), and as such, the pin is missing from my harness plug since I have a 5 speed. The light is ONLY activated when the system is low on water, not during the lamp test or any other time. This means that if an STi cluster was put into an automatic WRX, the I/C Spray light would illuminate instead of the AT temperature light.

Basically, what I am getting at is that I would like to replicate the factory system as much as possible. My car has a V8 EJ207 with a JDM ECU, a V7 gauge cluster, and a V7 intercooler splitter and scoop for the sprayer nozzle, so I don't see why I can't make it all work with a little effort like I did with my ambient temp sensor circuit.

Thanks in advance!

~T.J.
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Last edited by 02CWRX; 08-01-2012 at 02:19 PM.
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Old 07-21-2012, 12:42 AM   #2
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I was under the impression the auto button just continuously sprays water until the switch is released...
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Old 07-22-2012, 03:46 AM   #3
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Well, that wouldn't be very auto, now would it? Haha

Seeing as the ECU has all the parameters, my impression is that if you hit the manual button it would work on a timer or something maybe, then if you hit the second auto button it would go into auto mode and spray based on meeting the parameters in the ECU I listed earlier from the ROM. The interesting thing is the "JDM" wiring diagram I have doesn't show an "auto" switch, just the standard US STi on/off style switch with a timer (no interface to the ECU at all). It shows the interface for the cluster, the pump, level sensor, etc. It's definitely documentation for a 2002 STi, but it's not what I expected it to be. I wonder if it was ONLY the JDM cars that had the auto spray and maybe what I found is EDM manuals (they're in English afterall).

On a similar note, the manuals also explain where and what all the warning lights on the STi cluster are and it does show that I should have an indicator light on my cluster. I will pull the cluster and look into it further later, but at least I know where to look now.

~T.J.

Last edited by 02CWRX; 07-22-2012 at 04:56 AM.
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Old 07-22-2012, 12:07 PM   #4
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I just took my auto sprayer out. I used the JDM button (its basically just an on / off switch) to activate a pressure switch. Then when the boost reached a certain pressure it would activate the sprayer). If you are interested in the switch and pressure switch let me know. They are just sitting in my glovebox at the moment.
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Old 07-22-2012, 04:10 PM   #5
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Here is a wiring diagram for a ver.3 intercooler auto spray system.. Hope it helps
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Old 07-22-2012, 04:33 PM   #6
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I think what overthecrux was getting at was if you use the auto spray switch in a USDM STI it continuously sprays until you release the switch due to the fact our cars are not wired to have the auto spray. Most people wire a boost pressure switch or a switch that triggers the sprayer at wide open throttle and just use the auto spray switch to arm the system..
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Old 07-22-2012, 07:40 PM   #7
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Quote:
Originally Posted by italy wrx View Post
Here is a wiring diagram for a ver.3 intercooler auto spray system.. Hope it helps
Where did the image go?
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Old 07-22-2012, 11:59 PM   #8
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Quote:
Originally Posted by klarowe View Post
I just took my auto sprayer out. I used the JDM button (its basically just an on / off switch) to activate a pressure switch. Then when the boost reached a certain pressure it would activate the sprayer). If you are interested in the switch and pressure switch let me know. They are just sitting in my glovebox at the moment.
Interested. I will send you a PM.
Quote:
Originally Posted by italy wrx View Post
Here is a wiring diagram for a ver.3 intercooler auto spray system.. Hope it helps
Thank you VERY much! I will look into how similar this is to anything else I can find. If not, I at least have the concept for the relays, etc.
Quote:
Originally Posted by italy wrx View Post
I think what overthecrux was getting at was if you use the auto spray switch in a USDM STI it continuously sprays until you release the switch due to the fact our cars are not wired to have the auto spray. Most people wire a boost pressure switch or a switch that triggers the sprayer at wide open throttle and just use the auto spray switch to arm the system..
Oh, right. Got it. I was assuming he was answering my question about how it works from the factory in the JDM cars. I found a picture of a front clip of a V7 car, and they definitely have BOTH switches in their cars, as the diagram shows. One activates it manually, the other auto (note the interface with the computer in the diagram).
Quote:
Originally Posted by hybrid gti 2 View Post
Where did the image go?
It didn't work for me at first either, but it's there now.

If anyone knows where to find a REAL JDM diagram for an 02 STi (not the EDM I have) with the auto spray, that would be AWESOME. For now, I'm super excited to have at least the above diagram to get me going. Again, thanks a lot!

~T.J.
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Old 07-23-2012, 12:16 AM   #9
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Anyone have any part numbers for these required parts?
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Old 07-24-2012, 02:19 PM   #10
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To the top in hopes of finding the correct JDM wiring diagrams... I have now located two diagrams, the one posted in this thread as well as another, but neither are correct for the V7/V8 cars.

On an off chance, I have also emailed Subaru of America to see if they can assist in getting me the page from Subaru of Japan.

~T.J.
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Old 07-24-2012, 03:49 PM   #11
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Maybe you should post something in the international forum and see if someone can give you more info..
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Old 07-24-2012, 04:54 PM   #12
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Good idea, thanks. I posted a thread there, and I also went ahead and just called Subaru of America. The rep was surprisingly willing to see if he could get a hold of Subaru of Japan for me, he said they have a couple contacts over there that might be able to help.

~T.J.
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Old 07-25-2012, 08:20 AM   #13
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Quote:
Originally Posted by 02CWRX View Post
Good idea, thanks. I posted a thread there, and I also went ahead and just called Subaru of America. The rep was surprisingly willing to see if he could get a hold of Subaru of Japan for me, he said they have a couple contacts over there that might be able to help.

~T.J.
Interested in this as well. Let us know what you find. Just curious. Your JDM ecu still have odb2 for emission purposes?
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Old 07-25-2012, 12:56 PM   #14
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When Brian at iWire did my wiring merge for my swap, I got him to wire in the Auto Spray. According to him, its a pain in the ass to wire in.

It works for me and is triggered using five parameters measured by the ECU. The parameters I've found for the later versions of the STI to spray on auto are:

Coolant Temp
Engine RPM
Boost Pressure
Vehicle Speed
Air Inlet Temp

Apparently you can change these somewhere in the ECU but I have no idea where.

I had it running from my 12L Spec C tank and it went through that water really fast. The nozzle they use is so inefficient that it wastes the water.
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Old 07-25-2012, 03:46 PM   #15
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Quote:
Originally Posted by talvai View Post
Interested in this as well. Let us know what you find. Just curious. Your JDM ecu still have odb2 for emission purposes?
Yes, no problems passing emissions, both OBDII and tail pipe sniffer while stationary.

Quote:
Originally Posted by Zaider View Post
When Brian at iWire did my wiring merge for my swap, I got him to wire in the Auto Spray. According to him, its a pain in the ass to wire in.

It works for me and is triggered using five parameters measured by the ECU. The parameters I've found for the later versions of the STI to spray on auto are:

Coolant Temp
Engine RPM
Boost Pressure
Vehicle Speed
Air Inlet Temp

Apparently you can change these somewhere in the ECU but I have no idea where.

I had it running from my 12L Spec C tank and it went through that water really fast. The nozzle they use is so inefficient that it wastes the water.
Thanks for confirming what I had already posted. As I previously posted, I have already looked through the ROMs and it's all there. Plenty easy to change like anything else you are tuning.

I don't think it's going to be a "pain in the ass" per say, but that's a relative term, haha. The biggest problem I see with it is that the US chassis doesn't have the wires run for the system (like adding AVCS wires), that's about it. Other than that, its a couple switches, a couple relays, a diode, and a timer. My plan is to use the USDM switch as my main switch (same as JDM main), the USDM timer (Im sure it's the same also), get the JDM auto switch for the second switch, pick an STi tank to use (with pump and level sensor) then just use standard Bosch relays and a diode wired to match the diagrams I have seen and interface with the cluster. I have already wired AVCS, DCCD, outside air temp sensor, etc. I don't think this should be too much more difficult.

The big hold up right now is figuring out which wires of the ECU control the system which is why I need the diagram.

~T.J.
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Old 07-25-2012, 03:50 PM   #16
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Quote:
Originally Posted by 02CWRX View Post
Thanks for confirming what I had already posted. As I previously posted, I have already looked through the ROMs and it's all there. Plenty easy to change like anything else you are tuning.

I don't think it's going to be a "pain in the ass" per say, but that's a relative term, haha. The biggest problem I see with it is that the US chassis doesn't have the wires run for the system (like adding AVCS wires), that's about it. Other than that, its a couple switches, a couple relays, a diode, and a timer. My plan is to use the USDM switch as my main switch (same as JDM main), the USDM timer (Im sure it's the same also), get the JDM auto switch for the second switch, pick an STi tank to use (with pump and level sensor) then just use standard Bosch relays and a diode wired to match the diagrams I have seen and interface with the cluster. I have already wired AVCS, DCCD, outside air temp sensor, etc. I don't think this should be too much more difficult.

The big hold up right now is figuring out which wires of the ECU control the system which is why I need the diagram.

~T.J.
Ugh. Reading owned me. Sorry about that.

You could send Brian an email and ask him about the wiring since he's done it and it works. Since its his business, Im not sure what his response would be but he's a really helpful guy and its worth a shot.
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Old 07-25-2012, 04:10 PM   #17
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Haha, no problem, I'm glad to hear that someone confirmed it works. It sounds like your setup is what I am thinking about doing, with the 12L Spec-C tank and all.

I did in fact call him after you posted his name (hadn't heard of him before that), but as I suspected, he was not in a hurry to let go of anything he has on the subject. Completely understandable, that's part of how he makes money, he can't just give stuff like that away for free. Super nice guy though, and I will definitely keep him in mind if I ever need a service like his.

I will just continue my search and see where it leads me

~T.J.
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Old 07-25-2012, 04:41 PM   #18
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Yeah, I kind of figured that's what would happen. I definitely vouch for Brian for any wiring needs though. He was great for my swap/merge. Really knows his stuff. He charged me $50 to add on the IC Auto Spray and afterward he said he would never do it as cheap as that again because it was a pain in the ass. That's where I got that from.

That's the system I ran with last summer. This summer that tank is getting switched over to Meth and I am not sure what I am going to use for water spray (if anything).

Good luck with your search!
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Old 07-25-2012, 07:04 PM   #19
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I just confirmed that grounding pin B5 on the i11 plug causes the "I/C Spray" light to illuminate on the cluster. This is on par with what I am seeing in the diagram for both the auto and manual spray systems where in the case of low water level, a ground signal is sent to the cluster. The diagrams specify that this is the same wire used by the A/T Oil Temp light for non-STi cars (automatics). This is interesting because if anyone were to put an STi cluster into an auto WRX for instance, it seems to me the I/C Spray light would come on instead of the A/T Oil Temp Light if there was ever a problem (and or possibly light up with the key-on self test function). I don't recall seeing this listed anywhere in the STi cluster swap FAQ, but on the other hand, I didn't really read it that close.

~T.J.

Last edited by 02CWRX; 07-25-2012 at 09:25 PM.
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Old 07-30-2012, 04:28 PM   #20
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Interesting thought I had the other day about this. I was thinking it would be neat to be able to have an easy to see visual indicator when the spray system is activated since it should be automatic. I was thinking like an indicator light of some kind, and then it occurred to me that it should be easy enough to add a third relay to the circuit which would trigger when the pump gets a signal to run. That relay could then pass a ground signal to the stock I/C Spray light on the cluster. That way, the light would come on whenever the pump is running, OR, it would come on and stay on solid when the tank is empty. I think I will experiment with that once I have the rest of the circuit working.

The other issue I will be facing is that JDM cars don't have cruise control. At least, none I have ever seen (no switches on the steering wheels and no switches in the dash). That means I only have one empty switch spot (I have cruise control and fog lights), and I need two switch spots. I am trying to figure out a way to possibly relocate a switch, but the type of switches they are limit where they can go. Once I have things working, I may see if I can simplify the diagram to eliminate the manual switch, use JUST the auto switch (and relays as needed) to make the system work. Thus, you would have one switch, turn it on, and it's already in auto mode ready to go.

~T.J.

Last edited by 02CWRX; 08-01-2012 at 02:30 PM.
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Old 07-31-2012, 12:45 AM   #21
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Progress! I found a ECU diagram which I think is exactly what I needed. I should be able to take the information in the ECU diagram and combine it with the other diagrams (one posted here), and make the system work. Now I need to do some parts collection, testing, and if it works, I will do a how-to.

~T.J.
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Old 08-01-2012, 11:17 AM   #22
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i wired in a boost pressure switch when i put on a JDM auto switch. I like it. Someone over at IWSTI did a writeup for this exact mod
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Old 08-01-2012, 12:05 PM   #23
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Good job with the boost switch. Are you saying someone did a write up for the boost switch, or the ECU controlled auto spray like I am doing? I'd like to see it if it was the ECU controlled auto spray.

~T.J.
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Old 08-01-2012, 01:56 PM   #24
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I like ECU idea better than just by boost. By boost just means when your on boost it floods your intercooler with water. That is not very effective. Idea is to spray a mist so it evaporates quick and therefore cooler air. If the intercooler is just getting soaked with water its not doing anything. If anything want to say it makes it worse.

Just think about it. Your on a track with boost control. Majority of the time that thing is going to be spraying non stop. In beginning sure it will be great but after its just going to be wet and nothing more. Least with ECU it checks not only boost but other wide range of variables. Wish their was a temp sensor you could put on intercooler as that would be very helpfully.

On sidenote with ECU little curious to see how it functions with modded car. Cause if stock boost limit lets say is 9psi and now your tuned with mods doing 20psi wonder if that affects when it sprays anymore or less. Or if you can change that variable on the ECU itself
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Old 08-01-2012, 02:14 PM   #25
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I too believe the ECU controlled is the better way to go, which is why I am looking into this. I am fortunate enough to have a JDM ECU because of my engine swap that has the capability, so I figure, why not use it?

As for your question, yes the settings can be changed in the ECU. You do it the same way you would tune your car open source with the Tactrix cable. So for your example, yes, you could raise the pressure at which is sprays.

~T.J.
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