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Old 03-25-2012, 10:28 PM   #1
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Does a Cold air intake increase hp or mpgs?

So I just put a lift and 33's on my tj and was wondering.. Do cold air intakes help increase horsepower or mpgs? I have gotten so many different answers from so many people and I need some definite answers.
Also how much does aftermarket exhaust help in these areas?

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Old 03-25-2012, 10:31 PM   #2
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I put a Banks ram air and cat back exhaust on my 97 and notice better throttle response and less bogging for sure. Gas mileage as increased maybe 2mpg if I'm driving easy on it. I'm happy with how it turned out. Sounds way better now then stock.

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Old 03-25-2012, 10:37 PM   #3
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No. I have before and after mpg data (~50 tanks logged) and did 18 pulls on my dyno during testing. It made an average of 5hp more, but my error is +5hp.
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Old 03-25-2012, 10:39 PM   #4
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I would say the money wasted on it could be used for fuel, if you want true cold air get a snorkel ;D
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Old 03-25-2012, 10:40 PM   #5
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Well MOST of the peeps will chime in to transfer the money you would have put in for the Cold Air, Exhaust, etc.. into the right re-gear for your setup. You will have better benefits. Some say those mods do help but the numbers don't lie. There are TONS of threads on how the money was wasted on those upgrades.

BUT, it is all personal preference. I put a custom exhaust, JBA headers, etc on my Full Size Bronco and found that the Gears were the best money I spent. SO I am talking from experience. Anyway, good luck on your

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Old 03-25-2012, 10:47 PM   #6
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Thanks for the input guys. But re-gearing would probably decrease mileage even more wouldn't it? I definetly don't need that as it my Daily Driver as well.
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Old 03-26-2012, 12:48 AM   #7
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unless you have pre computer. your computer will make the adjustment, so...no
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Old 03-26-2012, 02:38 AM   #8
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Stock intake is already considered to be unrestrictive...on some vehicles, a cold air intake/high flow filter will do wonders. The Jeep Wrangler is not one of them. Spend that money elsewhere...or I can give you my Paypal addy...
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Old 03-26-2012, 03:11 AM   #9
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I'm happy with how it turned out. Sounds way better now then stock.
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Old 03-26-2012, 04:10 AM   #10
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Bigger tire with less rotations per mile will need a proper speedo gear change to read accurate values and a gear change to put the RPMs back to where they are on smaller tires at a given speed. Bolt-ons cant fix improper gearing. Properly choosing a gear ratio to match the tire size can only help MPG return to almost stock. Can't be as good as stock because bigger tires=more weight and rolling resistance.
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Old 03-26-2012, 12:12 PM   #11
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Thanks for the input guys. But re-gearing would probably decrease mileage even more wouldn't it? I definetly don't need that as it my Daily Driver as well.
I run 33s with 4.88s gears (gearing choice depends on your engine/trans combo). I can get anywhere between 12-18mpg, depending entirely upon how I drive.

If you keep your foot off the throttle, keep it under 60mph on the highway and keep it under 2500rpms around town, you'll get damn good mileage.
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Old 03-26-2012, 03:13 PM   #12
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you'll get damn good mileage.
Damn good for a jeep maybe I got 24 mpg doing 80 on the freeway in my supercharged mustang with ~3x the hp.
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Old 03-26-2012, 03:27 PM   #13
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I run 33s with 4.88s gears (gearing choice depends on your engine/trans combo). I can get anywhere between 12-18mpg, depending entirely upon how I drive.

If you keep your foot off the throttle, keep it under 60mph on the highway and keep it under 2500rpms around town, you'll get damn good mileage.
In other words, keep your finger off that O/D OFF button or, as my kids call it, the "Turbo Boost".
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Old 03-26-2012, 03:29 PM   #14
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Damn good for a jeep maybe I got 24 mpg doing 80 on the freeway in my supercharged mustang with ~3x the hp.
are we talking about mustang's here? strap a barn door to the front of your mustang, then see what kinda mileage you get
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Old 03-26-2012, 03:31 PM   #15
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I run 33s with 4.88s gears (gearing choice depends on your engine/trans combo). I can get anywhere between 12-18mpg, depending entirely upon how I drive.

If you keep your foot off the throttle, keep it under 60mph on the highway and keep it under 2500rpms around town, you'll get damn good mileage.

For me, keeping my LJ at 60 gets me maybe 18 MPG, but driving it just over 65 gets me about 20 MPG. 55 gets me about 16.
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Old 03-26-2012, 04:35 PM   #16
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If your Jeep has 3.07 gears and you put 33s on it you effectively rendered your 5th gear worthless.

If you regear you will see an increase in performance and as long as you don't go crazy you can get a decent balance between pulling power and MPG. It's burning more gas now because it has to work harder to turn the larger tires.

If you're going to run larger tires in the future though I would gear for that and be done with it... That's not an expense you want to tackle twice.
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Old 03-26-2012, 06:30 PM   #17
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It's the 4.0l with the 3 speed auto. It does pretty well in first and second but it's really working it in third gear at highway speeds. I just don't know if it's worth the time and money to re-gear it.
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Old 01-21-2014, 11:53 PM   #18
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Old 01-22-2014, 12:11 AM   #19
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I liked this a lot. Thanks.
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Old 01-22-2014, 08:42 AM   #20
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If your Jeep has 3.07 gears and you put 33s on it you effectively rendered your 5th gear worthless.
I disagree with you. I use my 5th gear allllllll the time. It's only steep hills where any vehicle would have to downshift that I have to go down.
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Old 01-23-2014, 03:03 PM   #21
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That anyone would disagree with 02Prove's two year old assertion is more than a little surprisingto me. Unless the person disagreeing really had 3.73 gearing and only thought he had 3.07. A Wrangler with 33" tires and 3.07 gearing is a dog at best and 5th gear would be nearly unusable
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Old 01-23-2014, 03:23 PM   #22
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That anyone would disagree with 02Prove's two year old assertion is more than a little surprisingto me. Unless the person disagreeing really had 3.73 gearing and only thought he had 3.07. A Wrangler with 33" tires and 3.07 gearing is a dog at best and 5th gear would be nearly unusable
Well, I DD my jeep 60 miles everyday. Granted its flat the whole trip i have no problems motoring in 5th. 4.0 5speed and 3.07s with 33's. Ive checked the diff tag also. Is it ideal, no.
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Old 01-23-2014, 03:29 PM   #23
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33s on 3.07 here. Quite a number of hills around here. Never use my 5th...for now. Sometimes with wind my 4th barely pushes it.
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Old 01-23-2014, 03:48 PM   #24
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Originally Posted by Jerry Bransford View Post
That anyone would disagree with 02Prove's two year old assertion is more than a little surprisingto me. Unless the person disagreeing really had 3.73 gearing and only thought he had 3.07. A Wrangler with 33" tires and 3.07 gearing is a dog at best and 5th gear would be nearly unusable
Mayyybbeee I'm special?
Factory build sheet says 3.07...
PO never swapped gears...
I think it comes down to driving style and terrain, maybe different interpretations of the text in the post. I do downshift on hills a lot, but I'm in 5th majority of highway driving.
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Old 01-23-2014, 03:56 PM   #25
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Stock intake is already considered to be unrestrictive...on some vehicles, a cold air intake/high flow filter will do wonders. The Jeep Wrangler is not one of them. Spend that money elsewhere...or I can give you my Paypal addy...
This.

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