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Old 07-02-2001, 09:08 PM   #1
Tkacik
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Location: Greensboro, Georgia
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'08 Forester LL Bean

Default Question about air temps.

Actually this is more of a question about the amount of moisture (humidity) in the air affecting the performance of my car. I have 1.8 AWD Impreza, and on the really hot and humid days here in Atlanta (we have been having a lot of those lately) I notice that the throttle response on my car tends to fluctuate constantly.....I mean it really feels bogged down sometimes. On cooler days the response is MUCH better, its really a big difference. I know that cooler air makes for a better mixture(obviously), but should there really be this big of a difference. The current mods that I have on my car are minimal as far the engine goes, all I have is a JC Sports Intake and a Supertrapp muffler. Would the installation of a S-AFC help out my case at all, so as to help the fuel air mixture?
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Old 07-02-2001, 09:32 PM   #2
imprezadan
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Cars just don't make as much power in humid conditions. The water in teh air takes up valuable space in the cylinder where there could be air instead. Turbo cars are effected even more-so.
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Old 07-03-2001, 04:36 AM   #3
mokeese
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He's right. not only, but I bet your intake isn't sheilded from the heat of the engine bay, which can also make you lose hp.
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Old 07-03-2001, 11:14 AM   #4
Tkacik
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Do you guys have any suggestions on how to solve this problem? Any good ways to shield the cone filter from the engines heat?
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Old 07-03-2001, 01:56 PM   #5
Peaty
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Old 07-03-2001, 08:46 PM   #6
STiTuner
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I always figured humidity was better... atleast when it was cold out. when its hot it sucks ass though. In my eyes the humidity was nothing more then water in the air.. water does not compress (which means you have higher compression of the air already inside). on a hot day the air molecules are spaced further apart so you would want less humidity to make up for the less dense air... HOWEVER! on a cold day when all the air molecules are crammed together it helps. atleast thats what I've noticed on my setup. I feel a little extra kick on those cool days right after it rains.

Brad
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Old 07-03-2001, 09:15 PM   #7
Peaty
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Hot air holds more moisture than cold though, psychrometricly speaking. Depending on the Dew point that is...
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Old 07-04-2001, 12:27 AM   #8
Kevin Thomas
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Default Simple!

Quote:
Originally posted by STiTkacik
Do you guys have any suggestions on how to solve this problem? Any good ways to shield the cone filter from the engines heat?
Cut up a cardboard box to make it fit the side of your intake closest to your engine bay. Wrap that cardboard box in plenty of aluminum foil. Duct tape the edges of the cardboard box if you like for a better seal. Make sure the top edge of the cardboard box is as close to the hood as possible. Heat will try to travel over the cardboard box to your intake. Do not remove your passenger side hood vent. It makes for a suction or vortex of sorts that'll draw the hot air over the edge of the cardboard box and into your intake, especially at idle.

The result will be 20-25F lower temp on the side of the cardboard box with your intake (the hotter the weather, the greater the difference and vice versa). You don't believe me? Get two cheap thermometers and place one on your intake side and one just outside the cardboard box closest to your engine. I did this and posted the results in a post called 'Heat Shield Experiment' a long while back. It wasn't pretty but hella affective. Free hp and all for probably less than $6.00 (Price of thermometers).

Also, add a vent hood scoop for added bonus. Makes for a cool air intake. Affect: 1-2mph gain in the 1/4 mile and .1-.2 drop in your E.T.'s. I tested and got these results.
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Old 07-04-2001, 05:42 PM   #9
Tkacik
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Kevin thanks for the suggestions...one problem. I have an L not an RS therefore I dont have any hood vents...will this mod still be benneficial, or will it just trap the hot air and give it no way to escape?
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Old 07-04-2001, 10:30 PM   #10
Kevin Thomas
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Default Beneficial

Quote:
Originally posted by STiTkacik
Kevin thanks for the suggestions...one problem. I have an L not an RS therefore I dont have any hood vents...will this mod still be benneficial, or will it just trap the hot air and give it no way to escape?
The mod will/should still work great. The vent hood scoop was just a bonus to it all. You should still see the temp difference I mentioned above. Actually, your intake should be trying to pull air from where it does when it's stock.
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Old 07-05-2001, 09:32 AM   #11
Tkacik
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Thanks kevin...I have found the perfect box to use Ill let you know how it goes
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