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Old 04-05-2005, 10:16 PM   #1
scooterforever
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Default Data points: impact of IC water spray on IC temps

Well, I finally put my 100 psi over-the-top water sprayer back on after 4 months of winter storage. One change from when I ran this setup last summer/fall, is that now I have a dual probe IC temperature gauge (reads temps from the turbo, reads temps leaving the IC, and tells me the difference in degrees F between the two).

I have only had time for one 20 minute run on and off the highway this evening, but I will edit this post to include additional data as I collect it. Here are my findings, which, for the lack of data logs, are somewhat subjective:

1. blasting water on the IC at 70 mph in 53 degree weather... does not lower temps in an already cool intercooler. I tried short bursts, I tried long bursts... the IC output temps didn't appreciably change. This is very useful information to me, because in my prior setup, I had a boost switch wired to fire the IC sprayer. In the course of a WOT run, I would exhaust 20% of my water supply. I now know that as long as my IC was cool from the start, spraying at boost probably doesn't help that much, at least for that particular WOT run. This may change as the temp rises towards summer.
2. sprayinig water on the IC after a WOT run, does cool the IC down faster than without the water spray. This is as expected.
3. a wet IC (either already wet, or spraying it when stopped) results in the IC heating up more slowly when at idle than a dry IC. Again, I lack the data logs to prove this, but 1. the theory makes sense, and 2. from how fast I have seen the IC warm up when idling, I feel confident it took more time with the sprayer than without.

For those interested, I'm using the Davtron dual probe gauge (purchased from Lindsey racing) on the stock intercooler with an '02 STi hood scoop and modified splitter.
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Old 04-05-2005, 11:14 PM   #2
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Nice. Where are you located? Keep us informed when summer rolls around.
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Old 04-05-2005, 11:34 PM   #3
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Quote:
Originally Posted by mantra1
Nice. Where are you located? Keep us informed when summer rolls around.
Mass -- so it'll get relatively hot in the summer, though certainly not tropical.
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Old 04-06-2005, 01:11 AM   #4
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how much did that IC temp gauge cost you? I went to their website but couldn't find it.
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Old 04-06-2005, 08:31 AM   #5
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I found it at Lindsey Racing -- but if you call Davtron I think they'll hook you up even though you may not find the product on their site. If memory serves, it was $250, which struck me as a bargain for a dual probe gauge that also reads the difference between the two probes. It's actually manufactured as an aircraft component. The only catch is you need to use a 32 threads per inch (? think that was it) tap, which I was able to find at McMaster after some searching.
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Old 04-11-2005, 10:22 AM   #6
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What would be really helpful is if you could get some numbers showing the cooling in every day commute situations. Heat soak occurs most often when sitting in rush hour traffic. Consequently, I find most of my sprayer tank getting used at stop lights and such.

For those without any way to test the temp, heres a little less scientific test. Sit in traffic in the sun for an hour with no sprayer. Pull into a gas station, pop the hood and put your hand on the IC fins. Then, in the same typ weather, do a good 70mph drive down the freeway. Again, pull off and put your hand on the IC fins. you will notice a substantial difference in he temp. In low to zero aoriflow situations, the TMIC is not the best thing. Thats when a sprayer becomes most effective.

And while your info above is good, is it possible you could put up some actual numbers? I am installing thermocouples before and after the IC in my wagon and would be interested in comparing.
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Old 04-11-2005, 10:53 AM   #7
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Quote:
Originally Posted by Calebz
What would be really helpful is if you could get some numbers showing the cooling in every day commute situations. Heat soak occurs most often when sitting in rush hour traffic. Consequently, I find most of my sprayer tank getting used at stop lights and such.

For those without any way to test the temp, heres a little less scientific test. Sit in traffic in the sun for an hour with no sprayer. Pull into a gas station, pop the hood and put your hand on the IC fins. Then, in the same typ weather, do a good 70mph drive down the freeway. Again, pull off and put your hand on the IC fins. you will notice a substantial difference in he temp. In low to zero aoriflow situations, the TMIC is not the best thing. Thats when a sprayer becomes most effective.

And while your info above is good, is it possible you could put up some actual numbers? I am installing thermocouples before and after the IC in my wagon and would be interested in comparing.
I'll see what I can do. What I lack is actual data-logging capacity (from a laptop or other automated approach). Stay tuned.
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Old 04-11-2005, 11:23 AM   #8
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Quote:
Originally Posted by scooterforever
I'll see what I can do. What I lack is actual data-logging capacity (from a laptop or other automated approach). Stay tuned.

While automated datalogging is nice, its not really necessary. If you have the probes, just spot checking under various circumstances will give you a good idea of whats going on.
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Old 04-11-2005, 11:28 AM   #9
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Interesting... Does the I/C thermometer take its readings from the center of the I/C? The side?
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Old 04-11-2005, 11:53 AM   #10
Calebz
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What I am looking at is a pair of probes, one looking at the air temp before the IC and one after. They will be embedded in the IC pipe.
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Old 04-11-2005, 12:40 PM   #11
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On my setup, one probe is right next to where the metal fitting for the Y hose is. The other (going into the throttle body) is in the opposite side, in the airflow leaving the IC and going into the throttle body silicone hose.
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Old 04-11-2005, 02:23 PM   #12
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Would be nice if There was a way to measure the result of modding by bypasing the TB heater, I was wondering how much the air temperature would drop after that.
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Old 04-11-2005, 02:43 PM   #13
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This is expected. I/C sprays are supposed to be for combating heat soak (like sitting in line for the strip). Water wont remove any more heat if the I/C is already operating at a nominalized temp.
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