Cold Air Intake? Are they worth it?
08-25-2010, 11:30 AM
#17
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Year: 1999
Model: Cherokee
Engine: 4.0
i had a mass air intake (just a tube and cone filter) and all it really did for me was make it louder when you romped on it and made the tb spacer whistle more. it was a headache trying to keep it from moving around and it kept falling off the throttle body. i know i know thats what i get for buying a universal kit but i wanted to see what all the hype was about.
08-25-2010, 12:03 PM
#19
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
An aftermarket cotton/gauze filter element MAY flow slightly more air at WOT than the stock paper filter element but, it will FOR SURE flow/pass more dirt (at any engine speed) than the stock paper filter element.
Gone are the days when the air filter element was a donut placed on top of a carburetor (yuk) and air passed very rapidly thru the filter element. Now days the filter element is placed as far away from the TB as practical and the air that flows thru the element is moving very slow.
Gone are the days when the air filter element was a donut placed on top of a carburetor (yuk) and air passed very rapidly thru the filter element. Now days the filter element is placed as far away from the TB as practical and the air that flows thru the element is moving very slow.
08-25-2010, 12:10 PM
#20
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Year: 1992
Model: Cherokee
Engine: 4.0 HO
I got the cheap ebay cai for 60$ and to tell you the truth, no difference in hp, and they carbon up your throttle body very quickly. because the breather tube spits the oil back into the intake AFTER the air filter, as opposed to the stock one. if you do want to get one because you like the whistling sound, I'd reccomend putting an inline fuel filter from a snowmobile on the hose that goes from the valve cover to the intake tube so that your tb doesn't carbon up so bad.
08-25-2010, 12:29 PM
#21
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Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Cause "air" is more dense at a lower tempurature, but the nitrogen(70% of air) and O2, have Ionic bonds, therefore it will take pressure above atmospheric(about 14 psi) to actually get a denser gas product, or a range of +/-200*C. CAI's are a waste of money.
You got your CAI, all hyped up, throw it on and take it for a drive, its pulling air from farther away from the engine and its immense heat, down the intake tube and into your throttle body, SWEET more cold air.......whoa wait a minute there buddy, its not instantaneously allowed in the intake valves, damnit, it just heated up to what it would have been with the OE intake box. BUT its still mildly colder, right? Yes, but minimally. So Im still getting HP gains? Yes, minimally.....but when are you going to let those horses roar? I mean peak hp is rarely ever acheived at normal driving speeds, damnit.
Peak torque is at 5500 RPM, peak horsepower is at 6500 RPM for almost every modern engine. Horsepower is responsible for moving the vehicle along and gives it the ability to cruise on the highway and accelerate in normal high speed driving conditions. Torque is the force that helps the vehicle start moving from a stop and pulls it up steep hills. Torque steps in again to provide power when your accelerating hard, hauling items or towing something behind the vehicle.
Now, a CAI is expected to give you 3-5hp.....added to your BHP, mind you no one cares about BHP, whats your WHP gains? Roughly around .67......hp gain. Totally worth $200.
You got your CAI, all hyped up, throw it on and take it for a drive, its pulling air from farther away from the engine and its immense heat, down the intake tube and into your throttle body, SWEET more cold air.......whoa wait a minute there buddy, its not instantaneously allowed in the intake valves, damnit, it just heated up to what it would have been with the OE intake box. BUT its still mildly colder, right? Yes, but minimally. So Im still getting HP gains? Yes, minimally.....but when are you going to let those horses roar? I mean peak hp is rarely ever acheived at normal driving speeds, damnit.
Peak torque is at 5500 RPM, peak horsepower is at 6500 RPM for almost every modern engine. Horsepower is responsible for moving the vehicle along and gives it the ability to cruise on the highway and accelerate in normal high speed driving conditions. Torque is the force that helps the vehicle start moving from a stop and pulls it up steep hills. Torque steps in again to provide power when your accelerating hard, hauling items or towing something behind the vehicle.
Now, a CAI is expected to give you 3-5hp.....added to your BHP, mind you no one cares about BHP, whats your WHP gains? Roughly around .67......hp gain. Totally worth $200.
08-25-2010, 12:33 PM
#22
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Year: 1995
Model: Cherokee
Engine: 4.0 I6
Boost or bust.
CAI is not worth the money, if its free Ill use it. Its mostly marketing hype, like TB spacers, High flow mufflers, etc
CAI is not worth the money, if its free Ill use it. Its mostly marketing hype, like TB spacers, High flow mufflers, etc
08-25-2010, 12:43 PM
#25
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Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
I beg to differ. A better flowing exhaust does offer a performance gain. Nothing spectacular, but a gain nonetheless. I will agree that TB spacers and Performance Chips are crap, but a lot of stuff you said doesn't work is stuff that I use and I get results with. And you're so into the 'boost or bust'.. where is a direct fit turbo or supercharger that is practical for the 4.0?
08-25-2010, 12:45 PM
#26
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Year: 1995
Model: Cherokee
Engine: 4.0 I6
Here-
http://www.streetbeatcustoms.com/Jee...o-Charger-Kit/
Mind you there are kits for it and universal turbos.
High Flow MUFFLERS are a joke, never said anything about exhausts. There was a thread recently where tests were shown and data.
http://www.streetbeatcustoms.com/Jee...o-Charger-Kit/
Mind you there are kits for it and universal turbos.
High Flow MUFFLERS are a joke, never said anything about exhausts. There was a thread recently where tests were shown and data.
08-25-2010, 05:09 PM
#27
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Year: 2000
Model: Cherokee
Engine: Inline 6
08-25-2010, 06:49 PM
#28
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
If it's louder, it's got to make more power. No???????
If that's true, then most Harley's put about 400HP to the ground.
If that's true, then most Harley's put about 400HP to the ground.
08-26-2010, 02:00 AM
#29
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Model: Cherokee
Engine: 4.0
I just replaced my stock setup with a universal CAI. In my case, however, we cut a small section out by the driver's side headlight to allow more cold air in past the radiator. I also took the metal tube and painted it with that 3M spray on noise reducer that you use inside the wheel wells. Performing these two steps has helped out dramatically, especially around 3k+ rpms. To be fair, I must note that a lot of work went into cleaning out the intake, and most of my fluids have been replaced, but the biggest performance difference I've seen resulted from a simple replacement of that stock intake.
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