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Old April 19th, 2012, 11:19 PM   #1
Catnip 0_o
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Default Cold Air Intake Suggestions? TJ 4.0L

Year: 2002
Make: Jeep
Model: Wrangler/4.0: I6


So I've decided to go with purchasing my next jeep upgrade by going with a cold air intake. Ive been looking through some different brands and Im trying to find the best bang for my buck. I'm not looking for the most expensive Intake but not the cheapest either. I'm overall looking for an aftermarket intake that will provide a little extra horsepower, extra fuel economy and torque.

Any suggestions and feedback are greatly appreciated :)

So far I've taken an interest in in Airaid 310-158 system and the K&N 57-1514-1 Fuel Injection Per Kit but am unsure which would be better.
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Old April 20th, 2012, 07:47 AM   #2
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How about this Click image for larger version

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Macscoldairintake.com
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Old April 21st, 2012, 06:14 AM   #3
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One thing to always keep in mind is the use you expect to see in your vehicle; the stock intake take "cold" air and water intrusion into account and is rigorously tested to be the best compromise between cost and function.

Now - I have not looked at recent cold air intakes for a TJ, well actually, I've never looked - but the biggest mistake I've seen on the cheaper units has been little-to-no shielding around a poorly placed air filter. Sure, it's capable of taking in more air - but when you're moving slow - especially wheeling, you end up taking in hotter air and losing power.

Another thing is how some folks like big metal sewer pipe - but they don't think about heat transfer and how much higher the thermal conductivity of any metal is higher than any plastic.

One thing I suggest is to actually measure the temperatures you're seeing now. Two easy (yet somewhat expensive, if you don't have the equipment to do it) ways are through the OBDII ALDL connector using a scan tool OR using a thermocouple and an associated instrument that lets you measure the output.

Also: You may be able to come very close to the performance of an aftermarket system just by using a free-flow filter element and cleverly routing more outside air to your stock airbox.
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Old April 21st, 2012, 06:34 AM   #4
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The tj air box and plumbing is considered an upgrade for yj's, and flows pretty well. I'd probably just add a k&n and remove the air horn on the box since it reduces size and i think is tuned that way to eliminate induction noise.
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Old April 21st, 2012, 06:38 AM   #5
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Quote:
Originally Posted by Rob the plumber View Post
The tj air box and plumbing is considered an upgrade for yj's, and flows pretty well. I'd probably just add a k&n and remove the air horn on the box since it reduces size and i think is tuned that way to eliminate induction noise.
When you are talking about the air horn, do you mean the cover only or the entire box?
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Old April 21st, 2012, 07:27 AM   #6
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The horn is on the front of the air box here. Notice the reduction in size.
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Old April 21st, 2012, 07:41 AM   #7
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ah yes, so when removing it, are you placing some filter media over the front of it to stop sand from getting to the main filter???
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Old April 21st, 2012, 07:58 AM   #8
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I never did.
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Old April 22nd, 2012, 08:23 AM   #9
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The horn is on the front of the air box here. Notice the reduction in size.
That horn *may* only represent a restriction based on a free-er flowing air filter. You'd be surprised how well the bell mouthed opening is for gathering air..
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Old April 22nd, 2012, 08:35 AM   #10
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That horn *may* only represent a restriction based on a free-er flowing air filter. You'd be surprised how well the bell mouthed opening is for gathering air..
X2. Engineers get paid good money to design the bell mouth shape to increase air flow over the blunt opening in the box. I should know, I used to be one of them.
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Old April 22nd, 2012, 08:54 AM   #11
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I'm obviously no engineer, but the flare at the end might be good for smoothing out the incoming air, increasing velocity, but i bet the 90 degree bend kicks it right in the knee. I think the air horns primary job is to reduce induction noise, and the design of the horn helps get a little flow back. I would remove the horn and enlarge the opening in the box.
In the real world there would probably be zero seat of the pants gain with any aftermarket intake for a Jeep. Probably a gain of a pony or two. Mods like this shine when the entire engine is upgraded and the engine really needs more air.
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