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Old 06-25-2005, 11:11 PM   #1
Iceman12321
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Default Air Box

I've done some research on CAI, and i have a question. There are intakes that work with the stock air box, whereas there are others that do not. Are there any advantages or disadvantages with having the intake work with the stock airbox? Are there more power gains when using the stock airbox or without it?
thanks in advance
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Old 06-25-2005, 11:26 PM   #2
Handsdown
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you tend to retain more mid-range torque with it, but lose some peak HP high in the revs.

it's generally not worth getting rid of on the 99+ newer 2.5L's.
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Old 06-26-2005, 07:29 AM   #3
X4 SRT
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^^^ none of that has been proven anywhere. It's just speculation. Show me a dyno that proves an intake that uses the stock box makes more mid range torque than one that doesn't. If you're looking for an intake I would recomend either Injen or Cobb. People have good things to say about both.
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Old 06-26-2005, 06:24 PM   #4
HondaH8er
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I had a GanzFlow CAI that retained the stock airbox, and it didn't really do much. My A/F ratios didn't change, so it wasn't really pulling much more air into the engine. I recently purchased a short-ram Weapon R Secret Weapon, and when that went on, my A/F leaned out, indicating an increase in the amount of air entering the engine. I have not noticed any loss of torque anywhere in the rev range, abut the power difference is definitely noticable. Also, I have run some tests on air temps under the hood and in the fender, and have found that the only time a fender-fed CAI will help is in stop and go traffic, when underhood temps build up. Once you get moving, though, temps drop quickly. Parked, there was a 20F+ degree difference between underhood and in fender temps, but during normal driving, the difference was marginal, at best, and about 8f degrees. And I'm just talking about cruising around town. Also, once I removed the vent backing plate on the side with the intake, the temps tend to build a little slower, and drop back off faster. In other words, there really isn't much of a gain to be had with a CAI over a short-ram.

If you want the numbers:
http://www.rs25.com/forums/showthread.php?t=31368
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Old 06-26-2005, 06:28 PM   #5
hendo2.5
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is a short ram just the first half of the CAI? (ie no filter and the air does'n come from the fender?)
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Old 06-26-2005, 11:40 PM   #6
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Old 06-27-2005, 04:37 PM   #7
HondaH8er
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Quote:
Originally Posted by hendo2.5
is a short ram just the first half of the CAI? (ie no filter and the air does'n come from the fender?)

Kind of. A short-ram would be an intake that doesn't reach to the fender, so it will look like half of the Cobb, but it will have a filter on the end.

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Old 06-27-2005, 05:07 PM   #8
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short ram means that the intake piping is as short as possible so that air doesn't have too much surface area slowing it down on the way to the engine.

it really isn't a ram air intake unless you place the filter at a point that will cause positive pressure at speed... which is hard to do and is measured with a vacuum gauge. a ram air intake doesn't work too well for enclosed engine bays, so if you do that make sure you have lots of vents in your hood.
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Old 06-27-2005, 07:40 PM   #9
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so a car without any vents/scoops wouldnt work well with a ram intake?
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Old 06-27-2005, 09:22 PM   #10
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it's not a true ram intake if there are no vents leading to a positive pressure intake.

but in general short ram intakes don't make as much power, no.
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