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has anyone tried this on their MJ yet?


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http://www.jeepforum.com/forum/f11/easy-airbox-mod-pic-heavy-write-up-999113/

 

its a cold air intake that works off of your wiper cowl. has anyone else tried this and if so how well does it work? not even how well does it work is it worth doing? i am about to install a cold air on my MJ and i thought this would be way more efficient if it actually works. it looks like it would be much colder then one underneath the hood. is there something behind that on a MJ thats not on a XJ. i think it would be the same. 

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Spectra and Thor make them. Typically they go in the passenger side since the wiper motor is on the driver's side. It's the only real cold air intake there is aside from a cowl intake, but that's a lot more work. They're a noticeable difference, but they're very loud inside the cab.

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I have a cowl intake on my TJ and would not recommend it if you daily drive your vehicle. The noise is quite noticeable, even with a loose soft top. I can't say if I had any improvements power wise or mileage wise but according to my OBD scan tool, the intake temperature dropped substantially. I really did it to simply relocate the intake and move it out from behind the headlight. I haven't noticed any more dirt or dust in my air filter to warrant changing the filter more than once a year (my standard for all of my vehicles). After all, the cowl is where the HVAC system draws its fresh air from.  

 

I wanted to move the intake from behind my headlight on the '86 MJ. You see, I have this fear of dunking the front end under water and hydrolocking the motor. I decided to give the cheap Amazon snorkel a try since I didn't want listen to intake noise from a cowl intake. I assume the snorkel could be considered a cold air intake since it draws air in from the top of the windshield. Only time will tell if this was the right move for me.

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http://www.naxja.org/forum/showthread.php?t=1057821&page=7

 

About half way down the Page is where the dirt issues come up. The two guys with the issues are members here as well.

 

I looked at that pic on the first post again and that is a HO motor. The Renix has it's own special issues to adapt a CAI to. How exactly does that work any how? Hose out of the airbox into the cowl. Then run the intake hose like stock and seal up the front of the air box?

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I thought our trucks came from the factory with a cold air intake. The opening is right behind the grill.

Yes, but the airbox is still in the engine bay. It's more a comparison to the K&N filters people like to slap on and leave in the stock spot and call it a cold air intake when in reality all you're doing is sucking in more hot air from the engine bay. The difference over stock or in bay filters is pretty substantial.

 

Another benefit is it moves your intake significantly higher giving you the ability to cross deeper water.

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no personal experience, but in reading about it before I have seen complaints that people get a lot of water problems going this way.

i was thinking of putting a cone filter in the wiper cowl bay to help with dirt and water. 

 

I have a cowl intake on my TJ and would not recommend it if you daily drive your vehicle. The noise is quite noticeable, even with a loose soft top. I can't say if I had any improvements power wise or mileage wise but according to my OBD scan tool, the intake temperature dropped substantially.

i imagine you can here the air being sucked in pretty ferociously. i am not wanting to run a whole snorkel out side beside the windshield. any other suggestions?   

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Only real advantage of the in cab air inlet is it's boon for frequent farters by adding a little methane to the fuel mixture. and who ever is riding shotgun appreciates the quicker scavenging of the odor it leaves.  But, it sure would make it nice on those cold morning when a shot of starter fluid is needed to get engine fired up and can be accomplished without leaving the cab. Side note: wear gas mask while dispensing  S fluid  or other fuel enhancer.  

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Only real advantage of the in cab air inlet is it's boon for frequent farters by adding a little methane to the fuel mixture. and who ever is riding shotgun appreciates the quicker scavenging of the odor it leaves.  But, it sure would make it nice on those cold morning when a shot of starter fluid is needed to get engine fired up and can be accomplished without leaving the cab. Side note: wear gas mask while dispensing  S fluid  or other fuel enhancer.  

:offtopic: If you need starter fluid because it's a "cold morning", then you've got some other problem that needs addressed. I've never had this problem, starting cars completely cold at -30°F and lower, with or without block heaters. This includes my Lada, which runs about as well as things at the bottom of the ocean stay dry, my 310,000 mile MJ, and an old Chevy ten years AFTER a predominantly used-car dealer straight up handed my parents $2000 to avoid taking it on trade-in.

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no personal experience, but in reading about it before I have seen complaints that people get a lot of water problems going this way.

This and a LOT of dust. Check out the reviews on the Spectra cowl filters on the XJ forums.
The dust issue was more due to the environment it was run in ... dry dusty popcorn fart country would clog any filter. Guaranteed his motor looked the same.

 

As for water, i know three folks running the spectra systems in an 2 XJ and a TJ. No water issues, you need to dunk the whole front end to get water into the cowl. There is more chance if water issues using the stock system. There is lots of internet worry about getting water issues but i have yet to see an actual incident. More issues with hood vents, but even that's easy to solve. I would expect we'd see water issues here if they wrre a problem, it's not uncommon to see over 100mm rainfals in a day here in the fall/winter ... about 4" in a day. last november we had a 165mm day, now that was rain. And pretty much all of our trails have at least 5 or 6 deep water holes 10 months of the year.

 

That said, i wouldn't spend 5 cents on a spectre system ... i would build my own ... which is what I am doing. To relocate the filter to the passenger side and pull from an actual cowl scoop. But that's another story. But as for a cowl intake, just to get the inlet away from the lower end of the grill is a better choice in my books.

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