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Old 04-10-2004, 08:41 PM   #1
jmcomp124
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Question Turbo Hood Scoop- How does it function? Any special care during car wash

This is my "very first Turbo car" with a hood scoop, so I have a newbie concern.

I used to take my Jeep to a touch-free car wash (with wax and the works) and I am thinking of taking the FXT to the same place too.
If the water and wax gets inside the hood scoop, will that cause any problems in the long term? They usually require that the engine be left running (in neutral) during the wash. I was almost thinking of stuffing some cloth (silly thought) into the hood scoop to prevent the water/wax from getting in, but with the engine running I thought it may not be a good idea. Before I take it to the car wash, please educate me on how the "functional hood scoop" actually works.
Thanks,
-Jai
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Old 04-10-2004, 11:12 PM   #2
irmiger
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The hood scoop requires no "special" care at all and automatic car washes are just fine. The high-pressure water jets usually aren't angled enough to get inside the scoop and bend the intercooler fins. If wax buildup is a concern, then a periodic cleaning with an aluminum- and rubber-safe degreaser should periodically clean that out.

The scoop is a pretty simple thing so it's easy to understand. It directs air into the turbo's intercooler which, in turn, cools the air going into the engine itself. The reason for cooling the air is that as the turbo compresses the air, the air heats up. The cooler you can get that air, the more power you develop.

Simple huh?
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Old 04-10-2004, 11:29 PM   #3
jmcomp124
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Quote:
Originally posted by irmiger
The scoop is a pretty simple thing so it's easy to understand. It directs air into the turbo's intercooler which, in turn, cools the air going into the engine itself. The reason for cooling the air is that as the turbo compresses the air, the air heats up. The cooler you can get that air, the more power you develop.
Simple huh?
Thanks for the explanation. Makes sense, the cooler you can get the air, the more air molecules you can fit in (Ideal gas law PV=nRT..thanks to Avagadro, Charles and Boyle's law) and hence better combustion resulting in more power and a faster Forester
What happens to the water that get's into the intercooler?
Rain, snow etc?
-Jai
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Old 04-14-2004, 03:46 PM   #4
DriftZero
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No problem with wate getting in the IC. If you like the look of the hood scoop but find its a bit small for your taste, the Japanese 02-03 Sti hood scoops can fit your forester.



SOD
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Old 04-14-2004, 03:53 PM   #5
Chromer
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It doesn't "get into" it, it gets "onto" it and drips off the bottom. Same thing as getting water sprayed on your radiator.
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Old 04-14-2004, 05:35 PM   #6
looney
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Quote:
Originally posted by jmcomp124
Ideal gas law PV=nRT..thanks to Avagadro, Charles and Boyle's law) and hence better combustion resulting in more power and a faster Forester
nice to know we have a mad scientist among us...
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Old 04-15-2004, 09:53 AM   #7
Peaty
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Old 04-16-2004, 12:59 AM   #8
Ghostrider600
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FWIW, if you're really concerned about the efficiency of your intercooler, you'd have to take it off the top of the engine and swap to a Front-Mount intercooler (heat rises, etc, and even when you're moving, there's still some minimal residual heat-soak into the IC just from radiant heat from the engine itself--though the airflow counters this, moving the IC far away from the heatsource, and into maximum airflow is the best--it just sucks when you get backed into...)
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Old 04-16-2004, 01:40 AM   #9
Blugin
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Don't be woried about pressure wash bending fins eiher...I've pressue washed many an intercooler with no ill-effects... Don't even worry about the hood scoop. Just pretend you don't have one.
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Old 04-16-2004, 07:56 AM   #10
DriftZero
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Yea good point Blugin.


SOD
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