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Old 07-24-2013, 09:05 PM   #1
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Tj air intake

I was watching my 4.0 run, just admiring how good it looks, and I noticed a huge amount of suction coming from the air intake. It seems like the narrow intake tube outside the filter box is a crippling choke point, and it pains me to know my jeep is gasping for air. Anyway, how much would a cool air intake benefit my engine, and which kind is the best?

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Old 07-24-2013, 09:08 PM   #2
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Old 07-24-2013, 09:14 PM   #3
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Old 07-24-2013, 09:14 PM   #4
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What?
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Old 07-24-2013, 09:18 PM   #5
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Old 07-24-2013, 09:20 PM   #6
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Old 07-24-2013, 09:25 PM   #7
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What's going on?
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Old 07-24-2013, 09:31 PM   #8
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Old 07-24-2013, 09:31 PM   #9
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Come on guys, go easy, he's new. They are bustin yer chops. It's a questions that's been asked a lot. Use the search feature, click advanced, click TJ forum and then search for intake, cold air, etc. you'll f'ing it's a beaten dead horse subject. These folks are a world of knowledge and good people, just make as much use of he search feature as u can. Welcome aboard!

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Old 07-24-2013, 09:33 PM   #10
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Anyway, the stock box is pretty damn good. Cold air intakes are for sports cars. Wanna cool it off? Vent the hood with some louvers to let heat escape
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Old 07-24-2013, 09:36 PM   #11
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Will do, thanks much
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Old 07-24-2013, 09:36 PM   #12
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Old 07-24-2013, 09:39 PM   #13
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Personally, I think it would be a great benefit. But anytime you have something good coming in you should have something good going out (exhaust). Basically if you do one you should do the other. Take it to a local, reputable mechanic or exhaust professional and see what they say. You might even try a few different shops and get some opinions. I have had AEM in the past and really liked it. Currently I have Airaid intake and a full Borla exhaust on a '99 i6. Runs great for me! Hope this helps
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Old 07-24-2013, 10:51 PM   #14
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Personally, I think it would be a great benefit. But anytime you have something good coming in you should have something good going out (exhaust). Basically if you do one you should do the other. Take it to a local, reputable mechanic or exhaust professional and see what they say. You might even try a few different shops and get some opinions. I have had AEM in the past and really liked it. Currently I have Airaid intake and a full Borla exhaust on a '99 i6. Runs great for me! Hope this helps
Im not going to debate with you, but the air you're sucking in, is the same temp as the air you would be sucking in through the stock intake.

2nd, the jeep is a pump. it can only pump so much air into it then out of it at a time. The stock box doesn't restrict the jeeps air movement enough to make much of a difference.
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Old 07-24-2013, 10:55 PM   #15
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Old 07-25-2013, 05:39 AM   #16
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Come on guys, go easy, he's new. They are bustin yer chops. It's a questions that's been asked a lot. Use the search feature, click advanced, click TJ forum and then search for intake, cold air, etc. you'll f'ing it's a beaten dead horse subject. These folks are a world of knowledge and good people, just make as much use of he search feature as u can. Welcome aboard!

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Got my hand slapped for advising someone to use the search feature. I guess if your not smart enough to use the search feature you shouldn't be told. Maybe everyone should post a CAI question.
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Old 07-25-2013, 07:36 AM   #17
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Got my hand slapped for advising someone to use the search feature. I guess if your not smart enough to use the search feature you shouldn't be told. Maybe everyone should post a CAI question.
I got the same hand slapping. Amazing people still don't know how to search or even use google
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Old 07-25-2013, 08:29 AM   #18
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Can't go wrong with K&N Air Intake Either. Good bang for your buck purchase. I am also biased in the whole what you take in is going to eventually go out too. So, it is the same with cars, the better you have air flow in the better the air flow is going to go out. So, air intake is not a bad idea, but investing in an exhaust may help too. That is just my opinion though. What the other guys are saying is not wrong at all either.
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Old 07-25-2013, 08:49 AM   #19
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Can't go wrong with K&N Air Intake Either. Good bang for your buck purchase. I am also biased in the whole what you take in is going to eventually go out too. So, it is the same with cars, the better you have air flow in the better the air flow is going to go out. So, air intake is not a bad idea, but investing in an exhaust may help too. That is just my opinion though. What the other guys are saying is not wrong at all either.
You must own stock in K&N or have not read any of the CAI posts.
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Old 07-25-2013, 08:51 AM   #20
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Not a hand slapping at all. If its someone first time using a forum, the search feature is bizarre, vague and can be of no use at all. If you don't know how to pin point things, you could just put 'intake' and get EVERY instance of intake for CJ's, TJ, JK's, etc, in Threads, Posts, For Sales, etc, etc, etc. And get nowhere. At least if you are going take the time to give the OP a ribbing, give them a nudge in the right direction.

I run some AEM stuff in my twin turbo car, and it works great in a high performance machine where temperatures make huge differences. Unless your AEM or Airaid is getting air DIRECTLY from clean air OUTSIDE the engine bay or you run an ice filled cool-can around it, you are still sucking in hot engine bay air. Same air the stock box or $150 intake kit sucks in. But in my short ownership of my Jeep, I've learned she just sucks. Gas, that is. And I love her for it!

Is that to say I don't do my own thing? No way. I've got deep roots in power. So when I recently did her tune up, even tho everyone said K&N is a waste of money, just get a regular paper filter, I put in a Spectre (think K&N quality, lifetime warranty and half the price). To each their own. Exhaust? For the money, I think finding a local mandrel bender (my guy does all his by hand for perfect fitment, sometimes better than factory). Then send it out to be treated and coated for the elements. I lived on the coast the last 7 years and the exhaust has lasted since '06, not bad.
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Old 07-25-2013, 08:51 AM   #21
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Old 07-25-2013, 08:53 AM   #22
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I have not read a lick on the cai posts... I am also new to this.. Sorry bout it!
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Old 07-25-2013, 08:56 AM   #23
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Lol
Will it ever end? Next will be why is my MPG so bad.
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Old 07-25-2013, 09:05 AM   #24
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Will it ever end? Next will be why is my MPG so bad.
I just compare my Jeep to the M88A1 that I operated for years in the Army. It gets roughly 0.7 MPG!!!! My TJ compared to that is a very fuel efficient vehicle. Even tried using that as an excuse to park in the "fuel efficient vehicle" parking spots here on post. Lol
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Old 07-25-2013, 09:08 AM   #25
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Will it ever end? Next will be why is my MPG so bad.
My MPGs are really good, 12 to 17 depending on weight and wind.. I've seriously considered getting a 5 lb coffee can, cutting my tail pipe shorter, and attaching the can.. That should get me at least 2 more MPG
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Old 07-25-2013, 09:10 AM   #26
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Forgot to mention, the can must be painted safety yellow or electric blue for optimum results..
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Old 07-25-2013, 10:29 AM   #27
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Can't go wrong with K&N Air Intake Either.
Installing a K&N is one of the very worst things you can do for your engine, especially if you wheel it where dust & dirt is in the air. Of all of the commonly used air filters, the K&N is nearly the absolute worst when it comes to actually filtering dirt & dust out of the air. That isn't my personal opinion, that was shown in an ISO 5001 laboratory test of various air filters. Only one filter in a test of nine different air filters proved worse than the K&N at some of the filtration tests. Overall, the K&N was the worst performing air filter. It can flow more than most air filters only because it doesn't have much filtration going on. But if a paper element air filter has enough filtration area, it won't be restrictive either. What filter came out at the top? The AC-Delco paper element air filter, what I now run... and my engine performs just as well because the TJ's air intake system was designed to be non-restrictive, partially done by using a large enough filter area air filter so it would not be restrictive.

I too didn't know any better when I first started wheeling many years ago & installed a K&N air filter. Heck, I thought I was doing a good thing for the engine. Then a year or two later, a friend saw my properly/anally maintained K&N air filter and he suggested I remove the air intake tube from the top of the throttle body & wipe my finger around the inside of both. What I found was totally shocking, the inside of the air intake tube & throttle body was gritty/dirty... it was obvious the K&N was passing something besides clean air.

I immediately added an Outerwears pre-filter over the top of the K&N to try to help it filter a bit more. The Outerwears didn't fit the K&N all that well so it allowed dirt to come in from the side. To create a tighter fit for the Outerwears, an oiled foam Unifilter was added.



In the above photo, I pulled the Unifilter & Outerwears pre-filters back from that previous K&N air filter I used to run (stupid me) so you can see what it took to get it so the inside of the air intake was no longer getting coated in grime. I ran it like that for nearly a year until I found a better filtering air filter that would fit onto my modified air intake tube. And no difference in performance.

The below chart & text from that ISO laboratory test of air filters is just one small part of the entire test... but it is a good indication of just what a poor filter the K&N actually is...



(Quoted from the ISO lab test results) "In the chart above it’s important to note the different test durations for each filter. The AC Delco filter test ran for 60 minutes before exceeding the restriction limit while the AMSOIL and K&N tests each ran for 20 and 24 minutes respectively before reaching max restriction. In 60 minutes the AC Filter accumulated 574gms of dirt and passed only 0.4gms. After only 24 minutes the K&N had accumulated 221gms of dirt but passed 7.0gms. Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt. " (the lab's words, not mine)

I now run the factory OE air intake system with an AC-Delco paper element air filter. It has such a huge surface area that is can easily flow far more air than the engine can draw at WOT (wide open throttle) and redline RPMs.

And that 'trumpet' on the front if the air filter box? It too can easily flow more air than the engine can possibly consume. Why is it there? To speed up the air flow to help quiet the air intake system. No, it is not there to restrict air flow as some backyard mechanics swear it is there for.
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Old 07-25-2013, 12:34 PM   #28
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Wow. Just wow. I can't tell you how many DECADES and how many VEHICLES I've been using K&N in. Damn. Well, you learn something everyday.

Do you have a link for this? I'd be interested in reading the whole article. Thanks!
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Old 07-25-2013, 12:54 PM   #29
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Forgot to mention, the can must be painted safety yellow or electric blue for optimum results..
Plus be sure to use decaf.
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Old 07-25-2013, 01:37 PM   #30
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Wow. Just wow. I can't tell you how many DECADES and how many VEHICLES I've been using K&N in. Damn. Well, you learn something everyday.

Do you have a link for this? I'd be interested in reading the whole article. Thanks!
If you use your Jeep regurlarly in heavy dust, a K&N or other "free flow" filter probably is not the best choice but i would not worry about it. I have used them for 20+ years in one vehicle and 14 in another. My TJ has a drop in from the PO and it see dirt roads 3-4 times a year and I am not worried in the least. Take that study with a grain of salt. What is any equation to the driving conditions and to what is the net effecto on the engine? (think of all the people using K&N, other name brands and countless mystery ebay filters. If they killed engines, were are all the wasted motors?)

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