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08-08-2003, 08:43 AM | #1 |
Scooby Specialist
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Join Date: Jan 2000
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Location: Southern Ohio USA
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How you know your getting "heat soak"
Sorry for the noob question, but this is my first turbo car and was wondering how you know you are getting heat soak.
It was really hot yesterday afternoon, with high humidity and I was running my AC at medium and felt that the car was "lagging" a little bit. Some slow traffic too made it difficult to get fresh air into the intercooler/ Of course the AC on didn't help but it seemed a little more than usual. I tried the IC water sprayer a little bit but couldn't tell an immediate difference; don't know if that would even help at all. Did I just answer my own question or is there a way to tell if you are experiencing heat soak. Cheers, Davis
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08-08-2003, 09:07 AM | #2 |
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Join Date: Jun 2003
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your slowness was primarily from the a/c being on. heatsoak will affect your car..but no where near the degree the a/c does. a/c on makes you feel like the n00biest driver. lol.
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08-08-2003, 09:19 AM | #3 | |
Scooby Specialist
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Join Date: Jan 2000
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Quote:
Davis |
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08-08-2003, 11:16 AM | #4 |
Scooby Specialist
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Join Date: Feb 2002
Chapter/Region:
MAIC
Location: Latrobe, PA
Vehicle:2004 WRX STi 1991 TSi |
With the conditions you described, heat soak will occur very rapidly since there is a lack of airflow to the intercooler. The way your car was running would definitely be a sign of heat soak. The AC robs a ton of power also. A combination of using the IC spray and moving faster will help dissipate the heat and regain some lost power. Personally, I don't like to run my car very hard when the IC is heat soaked.
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08-08-2003, 11:37 AM | #5 |
Scooby Newbie
Member#: 23341
Join Date: Aug 2002
Location: Overland Park, KS
Vehicle:04 Rex STi WRB/Gold |
I have to disagree on the A/C having the most effect comment. I have rarely driven without the A/C on since getting it and I notice extreme differences in power when coming from a standing start especially.
If it is a quick stop sign after driving at a decent speed (assuming this is a no heat soak situation), very little attention is needed to get a clean, no bog start. However, if the car is sitting still for longer than a minute or so with the engine running (assuming a heat soak situation), you have to really think about not killing the engine when taking off. If I don't think about it ahead of time, a 'normal' clutch-gas transition will bog the engine to the point where it would die if the clutch was not pulled back. I think this shows the effects of heat soak pretty substantially. Regarding the water spray, since that is a reactive action in this case, the results of the spray come after the time it's needed. If you are thinking about the heat soak while you are still sitting at the light, give the IC a good 3-4 second shot with the spray. It does make a difference when you take off. |
08-08-2003, 01:16 PM | #6 |
Scooby Specialist
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Good advice guys. Thanks
Davis |
08-08-2003, 06:25 PM | #7 |
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Member#: 28506
Join Date: Nov 2002
Vehicle:2005 STi White/Gold |
I've got a SECS unit & have page 5 set up with the (4)
data items: KC - Knock Correction (Haven't seen any yet) BP - Boost Pressure (15.8 psig max so far) IN - INtake temperature & can't remember the 4th right now. But I have observed the following: The I/C heat soaks pretty quickly once the air speed drops below about 20 mph & then cools off pretty quickly once you get up around 55-60 mph. I've also sat in traffic & watched the IN rise to above 118F & sat and sprayed the I/C for a good 6-7 seconds steady & saw no change in the IN. The TMIC is good for steady driving at speeds above 45 mph, but sucks in slow speed/stopped conditions. When I see how high the IN gets I'm hesitant to drive the car hard until it drops at least down in the 90's. What it needs is a couple of small fans mounted on the bottom side of the I/C that kick on above a certain temp like the rad or a FMIC. |
08-09-2003, 10:16 PM | #8 |
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[quote]Originally posted by mazdman
I've also sat in traffic & watched the IN rise to above 118F & sat and sprayed the I/C for a good 6-7 seconds steady & saw no change in the IN. Spraying the intercooler when sitting still will do next to nothing. If you're not moving, the evaporation will not occur quickly enough to cool it significantly. Bill |
08-10-2003, 11:48 AM | #9 | |
Scooby Newbie
Member#: 28506
Join Date: Nov 2002
Vehicle:2005 STi White/Gold |
[quote]Originally posted by '04 STi
Quote:
The I/C sprayer is or should be spraying a fine mist of H20 over the I/C. The heat transfer coefficient of evaporating H20 is much greater than that of liquid H20. Therefore, spraying the I/C while @ rest when the metal temperature is higher should cause greater evaporation & therefore a greater cooling effect not less if the mass & size of the droplets is properly sized. Since this is not occuring then the nozzle needs a greater atomization effect & mass flow so that the I/C spray is effective @ slow speeds or when stopped, when it is most needed. Also the heat transferred by such a small mass of H20 @ rest is negligible compared to the convective heat loss of a much larger mass of air once the car is moving. I'll try to get more data @ speed by maintaining a constant velocity & then spraying the I/C & monitoring the intake temps. |
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08-10-2003, 12:14 PM | #10 |
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Location: SoCal
Vehicle:2004 STi Aspen White |
i believe i read the manual on the psI^3 site that
the IN intake temperature is the temp of air going in the air box. not actualy intake charge temperature.. which means it shows the temp in the air box area, spraying the IC won't do anything to reduce this IN number. |
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