I have a smic sprayer setup on my M2 med with a fuel pump in the washer resevoir, and misting nozzles pointed at the IC and a Permacool fan to draw it through. It works great, but I am bad about forgetting to turn the switch off when I am done, so that means it empties out all the water after about 15 min and burns up the pump.

So I am having an EE friend on mine design a circuit the only lets the pump stay on in 1 min increments. Basically you hit the switch and the pump runs for 1 min and shuts down, if you want more you turn the switch off and back on. I find that 1 min is plenty of time for my setup to cool the ic down after heat soak and I really only use it when I think I might race someone, then I get excited when I win and forget to turn it off.

Anyways, the reason I am asking is if anyone else is interested we can pay to have a circuit board printed as opposed to wiring by hand.

 

Autospeed has an intercooler spray module that's kind of DIY and mighty cheap -

http://www.autospeed.com

I think it just kicks the sprayer on at a certain temp or the like.

Dale

 

a couple questions if you dont mind.

1) When do you use the fan/sprayer? Do you use it when you boost? or do you use it when its a IDLE?

2) if you look toward the last page of my notorious w/i thread (link in my sig), you will see a company that sells a module that is a "smart" IC misting module. It plugs in and connects to your dutycycle wire, has IC CORE heat relays, etc. Its around $150.

 

BTW, the site is: http://www.autospeed.com/cms/article.html?&A=0527

 

I mostly use the sprayer/fan when I switch to high boost (15lbs) to race someone or just play around. I have the fan on a seperate switch so I can leave it on while in traffic. I would rather have a manually controlled system so that I dont waste water. I dont need the system to come on when in traffic cause I usually run low boost setting of 10 lbs. I don't see how the automatic system would be good unless you had a large water supply. If I know I am about to race someone, I will turn it on and leave it on while racing. The system we will be designing will have a variable resistor on it to change shutoff time. Maybe from 30 sec to 1min of so.

 

have you thought of using a boost pressure switch? Just curious, they are like 25 bucks and you can set it to what ever psi you want, when you drop below that it turns off. you could do a number of things, for instance, get a boshe style relay with the 87 and 87A pins, you can set the pump to 87 and the fan to 87A, you can put a pressure switch to pin 85 and set it up so that when 85 gets power (from the pressure switch) the pump turns on, when 85 loses power the fan turns on. You can have an override that would allow you to run both at the same time.

Of course this doesn't answer your original question, just an idea.

 

This doesn't solve the heatsoak issue, wich is what I use it for. I want to cool the IC prior to a run, not during.

 

oh sorry, I mis read, I thought you would use the fan to solve the heatsoak and you used the water at 15 psi, nevermind

Im just glad I never get heatsoak anymore, no matter how long I have been idling .

 

Tell your EE friend to be a real engineer and etch his own board. It gets a little more dicey when you have a lot of traces on both sides, although its not impossible, and I really don't see your circuit being all that complex anyway, so it could probably be single-sided.

jds

 

um... why dont you just get a pressure switch to turn on the pump/sprayers when you get over 5psi boost?

 

um...read the thread.