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04-05-2005, 10:16 PM | #1 |
Scooby Specialist
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:1999 Legacy Outback |
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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04-05-2005, 11:14 PM | #2 |
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Join Date: Aug 2002
Location: Tampa
Vehicle:'08 Forester STi Shaggin' Wagon Thrice |
Nice. Where are you located? Keep us informed when summer rolls around.
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04-05-2005, 11:34 PM | #3 | |
Scooby Specialist
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:1999 Legacy Outback |
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04-06-2005, 01:11 AM | #4 |
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Join Date: Oct 2004
Location: Central,CA
Vehicle:03 WRX 4EAT WRB |
how much did that IC temp gauge cost you? I went to their website but couldn't find it.
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04-06-2005, 08:31 AM | #5 |
Scooby Specialist
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:1999 Legacy Outback |
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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04-11-2005, 10:22 AM | #6 |
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Member#: 54398
Join Date: Feb 2004
Chapter/Region:
NWIC
Location: Souf Central France
Vehicle:1980 CB400 Hawk 1996 GrandCherokeeLimited |
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. |
04-11-2005, 10:53 AM | #7 | |
Scooby Specialist
Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:1999 Legacy Outback |
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04-11-2005, 11:23 AM | #8 | |
Scooby Specialist
Member#: 54398
Join Date: Feb 2004
Chapter/Region:
NWIC
Location: Souf Central France
Vehicle:1980 CB400 Hawk 1996 GrandCherokeeLimited |
Quote:
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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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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04-11-2005, 11:53 AM | #10 |
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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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04-11-2005, 12:40 PM | #11 |
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Join Date: Feb 2004
Location: New England
Vehicle:1999 Legacy Outback |
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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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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04-11-2005, 02:43 PM | #13 |
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Vehicle:2002 PSM WRX (Sold) 2017 BMW X5 |
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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