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Old 05-05-2013, 07:32 PM   #1
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Cold Air Intake

Just bought my 2007 Jeep Wrangler. I was wondering what everyone recommends for a cold air intake?

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Old 05-05-2013, 07:33 PM   #2
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You have a JK this is the TJ section. You'd get more help in the JK section.

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Old 05-05-2013, 07:44 PM   #3
Knows a couple things...

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On this question, it doesn't matter whether he has a TJ or JK... don't believe the hype on CAI systems, you won't notice any (!) performance difference with a CAI on your JK. Really.
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Old 05-05-2013, 07:46 PM   #4
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Thanks
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Old 05-05-2013, 07:47 PM   #5
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On this question, it doesn't matter whether he has a TJ or JK... don't believe the hype on CAI systems, you won't notice any (!) performance difference with a CAI on your JK. Really.
THIS ^^^^^^^^^^^^^^^

It's like putting racing slicks on a Yugo. You don't have enough HP to make it effective.
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Old 05-05-2013, 07:49 PM   #6
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I am new to this forum how do i post in the JK section.
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Old 05-05-2013, 07:59 PM   #7
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First... for buying a JK instead of a TJ....Just kidding, enjoy your Jeep and don't forget to wave

Second...click link below
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Old 05-05-2013, 08:16 PM   #8
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First... for buying a JK instead of a TJ....Just kidding, enjoy your Jeep and don't forget to wave

Second...click link below
JK Jeep Wrangler Forum - Jeep Wrangler Forum
Guess the link I posted was broken....
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Old 05-06-2013, 10:31 PM   #9
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Guess the link I posted was broken....
My app on the ipad didn't show any responses posted yet. Thought I was the first.....
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Old 05-06-2013, 10:33 PM   #10
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I have an 07 and I put a K&N cold air intake in it. Sounds great and performs great! Gives about 7-8 hp increase.
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Old 05-06-2013, 10:46 PM   #11
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Gives about 7-8 hp increase.
so you ran a statistically significant number of dyno pulls on your Jeep to get these numbers?
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Old 05-06-2013, 11:01 PM   #12
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i have an 07 and i put a k&n cold air intake in it. Sounds great and performs great! gives about 7-8 hp increase.
o' rly?
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Old 05-06-2013, 11:40 PM   #13
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Well it's a car engine not a jeep or truck engine. It probly will show gains with a CAI. Where as the old inline 4 and 6 will not.
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Old 05-07-2013, 12:30 AM   #14
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so you ran a statistically significant number of dyno pulls on your Jeep to get these numbers?
Seat of the pants is a great gauge, much like how my entire right forearm has become a torque wrench.
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Old 05-07-2013, 01:32 AM   #15
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I feel like I have to use these images more often than on a honda civic forum... unfortunately. The simple fact these exist speaks volumes. Let's start off with:

and work our way into:

and

and...

AND

AND... AND AND
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Old 05-07-2013, 04:41 AM   #16
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I have an 07 and I put a K&N cold air intake in it. Sounds great and performs great! Gives about 7-8 hp increase.
How do you know bit increased HP? Did you dyno your rig to verify the results?
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Old 05-07-2013, 07:37 AM   #17
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How do you know bit increased HP? Did you dyno your rig to verify the results?
Ive looked it up online before I got the CAI.
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Old 05-07-2013, 07:41 AM   #18
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Old 05-07-2013, 07:46 AM   #19
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Ive looked it up online before I got the CAI.
I looked up some interesting dyno testing online too, but tests not performed by the manufacturer, and performed in repetition. the guy did 18 dyno pulls, and none of them showed any statistically relevant results. just to prove how easy it is to skew dyno results, he was able to "display" a 7-10 hp/tq gain just by pumping the tires up from 25psi to 50psi. But if you look at the standard deviations, you'll notice all the runs overlap...meaning there is no statistical difference between any of the runs.

https://www.tricktuners.com/forums/showthread.php?t=226
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Old 05-07-2013, 08:34 AM   #20
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Old 05-07-2013, 08:34 AM   #21
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Originally Posted by UnlimitedLJ04 View Post
I looked up some interesting dyno testing online too, but tests not performed by the manufacturer, and performed in repetition. the guy did 18 dyno pulls, and none of them showed any statistically relevant results. just to prove how easy it is to skew dyno results, he was able to "display" a 7-10 hp/tq gain just by pumping the tires up from 25psi to 50psi. But if you look at the standard deviations, you'll notice all the runs overlap...meaning there is no statistical difference between any of the runs.

https://www.tricktuners.com/forums/showthread.php?t=226
That's cool to know. What size tires in that equation? I run 35's so if I air to 50 can I realistically look at 10-12 HP? They are 6 ply Dunlops if that helps.
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Old 05-07-2013, 10:42 AM   #22
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That's cool to know. What size tires in that equation? I run 35's so if I air to 50 can I realistically look at 10-12 HP? They are 6 ply Dunlops if that helps.

Well... no.... larger radius tires = less hp/tq. I believe the issue on the dyno is that since you're strapped down the lower air pressure was creating lots of resistance with the roller.
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Old 05-07-2013, 10:47 AM   #23
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Just a cold air won't add power. Now if you add other things they will work together. But that can cost a lot. Best to just leave stock unless your going to tear into the engine.
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Old 05-07-2013, 12:05 PM   #24
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Just a cold air won't add power. Now if you add other things they will work together. But that can cost a lot. Best to just leave stock unless your going to tear into the engine.
YEP. There's nothing, nothing you can do to the outside of a Jeep engine that will provide an appreciable return. If you're truly seeking a performance gain, you gotta get inside the engine.
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Old 05-07-2013, 12:29 PM   #25
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YEP. There's nothing, nothing you can do to the outside of a Jeep engine that will provide an appreciable return. If you're truly seeking a performance gain, you gotta get inside the engine.
Technically, a turbo or supercharger is outside the engine.
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Old 05-07-2013, 08:59 PM   #26
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Technically, a turbo or supercharger is outside the engine.
And both will grenade a stock Jeep motor in short order if not accompanied by other internal modifications to handle the higher RPMs that are required before either of those items start providing appreciable horsepower gains.
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Old 05-07-2013, 09:06 PM   #27
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And both will grenade a stock Jeep motor in short order if not accompanied by other internal modifications to handle the higher RPMs that are required before either of those items start providing appreciable horsepower gains.
false
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Old 05-07-2013, 09:35 PM   #28
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false
OK, I'll play (for a while) ...... at what RPM range do you think a turbo starts delivering it's optimum output? And remember ... in the above post I said "appreciable" horsepower increases.
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Old 05-07-2013, 09:43 PM   #29
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OK, I'll play (for a while) ...... at what RPM range do you think a turbo starts delivering it's optimum output? And remember ... in the above post I said "appreciable" horsepower increases.
Here's a dyno chart of a turbo 4.0L making 250 ft-lbs before 2500 rpms, at the wheels.



notice the beautiful flat torque curve....and that's a modest 7 psi of boost. here's the build thread: Few YJ 4.0 Turbo picts - JeepForum.com

Most will agree the Jeep has plenty of power off-road, whether it's a 4-cyl or 4.0L 6-cyl. Where more power is needed is climbing mountain passes and on the highway, and there, the 4.0L spends the majority of it's time between 2000rpms and 4000rpms - even if you're geared properly.
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Old 05-07-2013, 09:44 PM   #30
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OK, I'll play (for a while) ...... at what RPM range do you think a turbo starts delivering it's optimum output? And remember ... in the above post I said "appreciable" horsepower increases.
Which turbo? A large one, a small one, a medium one? It's not like the people designing these kits are complete morons. The turbo is sized according to when it should deliver power. How do you think BMW's staged turbo system works? One for lower rps and one for higher. It's all variable based on intended purpose.

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