mannykiller

iTrader: (93)

Whats up guys!

Just wanted to share a video I made on my Water sprayer set up. Sprays the Radiator and Intercooler. All controlled by the ECU now..but when I made the Video I had it on a switch. Check it out!

arghx

iTrader: (3)

Cool, Evos and STI 's came with those from the factory

REnaissance_Sle7in

iTrader: (8)

The previous owner of my Cosmo set up a water sprayer for it. It's spraying the oil cooler and intercooler. Its all run through the windshield washer sprayer. Very effective.

I like that yours is controlled through the ECU. Do you have it set up to spray once it reaches a certain temp? Or rpm?

KNONFS

iTrader: (14)

What results are you guys seeing? How fast do temps drop? how significant is the temp drop?

BLUE TII

iTrader: (9)

One trick you can do is make your water reservoir metal and put it in the engine bay where the water will get hot.

It is the latent heat of evaporation that cools the heat exchangers, so the faster the water evaporates the more water you can spray on to evaporate.

The more evaporation you can get over a given length of time the more cooling.

I experimented with this at the local hillclimb. Pretty crazy that spraying hot water on a hot intercooler instantly results in cool to the touch intercooler.

BLUE TII

iTrader: (9)

I just use a garden sprayer, but the results are incredible.

I can't give you any numbers, but if the water is hot it cools the intercooler down after a run from way to hot to touch (running 26psi boost) to cold to the touch in about 10 seconds of spraying/waiting.

Normally I rob the coolers of ice water to refill my sprayer and it cools much slower with ice cold water, but it is nicer to cool myself off with.

REnaissance_Sle7in

iTrader: (8)

For me, I don't have a way to monitor AITs, but from what I see from oil temps, it helps. For example: I had the Cosmo down at the dragon, and at the end of a run where I was seeing high oil temps (high 190Fs), I would pull the washer sprayer under decel and by the time I made it to either killboy or the "gravel lot" my oil temps would be down in the low 170Fs. I also used it during the drive down and back to help keep temps in check on the highway through the mountains.

I'd say after pulling the sprayer, after about 6 seconds I see temps either level off of start to go down. I believe if it 'misted' better (like Blue is alluding to) those results would be much better/faster.

This thread has me curious now though, I'd like to do a pull under boost and see what happens with temps and boost pressure.

j9fd3s

iTrader: (3)

so you need two sprayers? one for the driver and one for the car?

mannykiller

iTrader: (93)

Good enough to recommend it for any track car. Street car or daily? honestly... I don't think it's worth the hassle. Unless you turn your nozzles into tiny jets and spray people to the left and right haha.

mannykiller

iTrader: (93)

I really didn't like the idea of anything else metal in the engine bay. As is it's already pretty cluttered. And I've got a pretty straight forward set up. You may be right regarding the cooling. But whats the adverse affect of putting more Heat soaking material in the engine bay? Yes maybe it's cooling a bit more...but then maybe it's also causing more heat soak and making heat harder to get rid of due to the clutter of area. Also, if you put a metal tank in the engine bay... it might be kind of difficult to open after a hot lap. Anywhere but the engine bay means, it won't be hot to the touch.

BLUE TII

iTrader: (9)

Anywhere along the exhaust gets pretty warm and its the lowest point in the car (bonus).

Put just the fill in the bay, bins, fender arch or wherever you can get to it easily.

primerGrey

iTrader: (13)

It is true that most heat transfer occurs during a phase change (in this case, evaporation), but the idea that spraying with hot water cools more rapidly than spraying with cold water sounds a little odd.

Spraying with cold water will only result in less evaporation if the surface of the intercooler is... colder?

BLUE TII

iTrader: (9)

If you spray a set volume of cold water on a hot surface and the same volume of hot water on a surface, the cold water will cool the surface to a lower temperature as the surface has to heat the cold water to the point of evaporation and then the same volume of water evaporates whether it started hot or cold.

However, what I am talking about is given the same length of time and unlimited water the hot water cools a surface in less time as more evaporation can take place in a given length of time (it is already near the point of evaporation).

In actual practice of cooling a hot intercooler with a garden sprayer this turns out to be very noticeable difference in time to cool with counter intuitive outcome.

You spray cold water on the hot IC and it instantly evaporates on the turbo side and more slowly evaporates on the engine side. You spray more cold water on the turbo side and the cold water sprayed on mixes with the warmed water on the cooler engine side and cools it more so it takes even longer to evaporate.

You spray hot water on the hot IC and it all evaporates very quickly and you spray more hot water on which evaporates very quickly lingering on the cooler engine side for much shorter time.

Also any hot water sprayed on that mixes with hotter water still on the IC about to evaporate does not cool the previous water about to evaporate back down nearly as much so it is able to evaporate sooner.

Well, it is a super easy experiment to try- I suggest just doing it for yourself. Very satisfying.

primerGrey

iTrader: (13)

Is the output of this experiment visual confirmation that hot water evaporates from the surface of the intercooler more quickly than cold, or is there an air temperature probe measuring the actual cooling affect on the air going through the intercooler?

I can certainly believe that hot water evaporates more quickly from the surface. And it would indeed be counter-intuitive if measured air temps dropped more with hot water than cold.

Moe Greene

iTrader: (2)

I have a setup similar to this for my RX7, It sprays the oil coolers and radiator. When I finish rebuilding my engine I'll set it up to spray the intercooler; I will then try the hot water vs cold water theory and post the data. Also the nozzles I purchased creates a very fine mist with a wide spray angle; I do have an external pump located in the engine bay and the windshield fluid as the water source.