Air box mod - Jeep Compass Forum
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post #1 of 75 Old 06-30-2010, 12:44 PM Thread Starter
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Air box mod

not sure if i read this on here or on the caliber forums but there was a oem airbox mod which involved opening the box and removing the plastic piece inside that directs the air to the rear of the box.

well last weekend i did the mod, i ripped the inner piece out and threw it in the bush lol along with it i removed the "battery cover" section of the air system. and i couldnt believe the difference in throttle response. litterally half the amount of pedal to casually drive away from a red light. i imagine its close to an aftermarket cai in response.

to be noted while on full throttle the modded intake system is loud as fcuk. but i hightly recommend it. let me know what you guys think.


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post #2 of 75 Old 06-30-2010, 11:57 PM
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Are you talking about the easily removable black plastic part that goes overtop the battery and connects to the air filter?

Can you be a little more specific about what you did to the thing? Sounds interesting.
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post #3 of 75 Old 07-01-2010, 06:04 AM
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I can't remember what my stock air box looks like. I think I'll have to pull it out to see the deflector.

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post #4 of 75 Old 07-01-2010, 08:26 AM Thread Starter
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as with alot of threads no fun untill theres pictures

Step one remove this piece



Step 2 open the air box, reach into the right half and remove this piece ( just plastic tabs holding it in place no tools required)


Step 3) put the air box back together and enjoy.



i found better results with the front section over the battery removed as well. in the final picture you can see the air has a more direct path to the filter


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post #5 of 75 Old 07-01-2010, 12:01 PM
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Devil's advocate here! It seems to me if the engine company design engineers figured out that these two plastic parts were vital to allow the engine to run at optimum efficiency, wouldn't removing it put something else out of kilter and cause problems later on?

It appears to me that the first part is some kind of "tuned" chamber not unlike the speakers in a "Bose" sound system.
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post #6 of 75 Old 07-01-2010, 12:19 PM Thread Starter
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yes i love devils advocate skyeye

engineers have to accomplish alot of goals with a vehicle to appeal to a wide selection of the market. my thinking is that the "tuned chamber" is to dampen the sound. because the modded setup is quite loud. and i believe i read that smokey01 made 205hp with an cai and a custon exhaust. in theory thats 33hp over stock by freeing the air flow on both ends by sacraficeing the "dude, is your compass even running?" lol

if anyone tries this mod and doesnt like it just put the pieces back together


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post #7 of 75 Old 07-01-2010, 03:50 PM
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doing this tomorrow morning first thing.

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post #8 of 75 Old 07-01-2010, 05:34 PM
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Quote:
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yes i love devils advocate skyeye

engineers have to accomplish alot of goals with a vehicle to appeal to a wide selection of the market. my thinking is that the "tuned chamber" is to dampen the sound. because the modded setup is quite loud. and i believe i read that smokey01 made 205hp with an cai and a custon exhaust. in theory thats 33hp over stock by freeing the air flow on both ends by sacraficeing the "dude, is your compass even running?" lol

if anyone tries this mod and doesnt like it just put the pieces back together
Does this throw any CEL codes?
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post #9 of 75 Old 07-01-2010, 09:26 PM
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Shecky, I pulled a 2500lb trailer for around 2 1/2 hours, through 2 valleys with a head wind. The engine temp never got above 90 Celsius, and I could travel at 110 KPH (68MPH) no problems while getting 12L/100K (19.6 MPG). My buddy with his dodge ram 1500 mega cab with his 5.7 hemi pulling his trailer couldn't make it over 80 KPH (50MPH).

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Last edited by smokey01; 07-02-2010 at 12:13 AM.
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post #10 of 75 Old 07-02-2010, 03:47 AM
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Wow, thanks for the picks. Since it's easily un-doable I'm definitely going to try this one.
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post #11 of 75 Old 07-02-2010, 02:18 PM Thread Starter
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Does this throw any CEL codes?
no codes on mine


and smokey01 that is really impressive! go go gadget compass


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post #12 of 75 Old 07-03-2010, 02:22 PM
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After removing the piece I definitely noticed that it takes a lot less pedal to get the jeep going. I did notice a slight improvement in take off. and it is a little louder (the air whooshing in ?). Pretty cool little mod tho. I left the battery piece on, but I expect that without it u would again get better throttle response along with a relative increase in that intake volume. then again, ppl say the K&N CAI is loud as well...each to his own I guess.

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post #13 of 75 Old 07-04-2010, 10:34 AM
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Interesting mod there, never would have thought about that, but I see it kinda the same way as a CAI in that while you're getting more air in essentially letting the engine "breathe" better, I would mod the exhaust also to make it freer flowing and less restrictive than the stock setup. I think you would definitely see some performance gains as one mod would compliment the other, IMO.

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post #14 of 75 Old 07-04-2010, 01:10 PM Thread Starter
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yup cherokee my magnaflow kit should be installed next weekend


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post #15 of 75 Old 07-05-2010, 01:57 AM
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yup cherokee my magnaflow kit should be installed next weekend
Nice, I definitely want to hear the results after that install!!!

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post #16 of 75 Old 07-08-2010, 01:52 PM
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I took out the smaller piece inside the air box and noticed the engine does sound different - not sure if there is a noticeable power change though. Driving around without the battery cover provides a very noticeable sound change which I really like. I would also agree that without the cover there was a much better "off the line" feel.

I put the battery cover back on for now and will be trying to build one of these for the Compass: Caliber Forums - Air Intake Nozzle Mod.

The Compass design will have to be different than the Caliber design, as the Caliber's battery cover is a straight piece from the air box to the clips on the battery cover. The Compass's headlight placement is in the way, so the Compass's battery cover is offset about two inches from the air box input to the cover clips.

That does make it a tad bit more difficult, but I think I can make it work. Once I get a working cardboard model I'll post some pics - then hopefully I'll be able to fab a real one up!
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post #17 of 75 Old 07-08-2010, 05:32 PM
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Shump-o,

Can you bring the pictures across. I can't get into the pictures

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post #18 of 75 Old 07-08-2010, 06:33 PM
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Shump-o,

Can you bring the pictures across. I can't get into the pictures
Sure, here you go!
Attached Images
File Type: jpg Air Intake - Finished 1.JPG (92.0 KB, 209 views)
File Type: jpg Air Intake Pic 1.JPG (68.1 KB, 140 views)
File Type: jpg Air Intake Pic 2.jpg (73.1 KB, 135 views)
File Type: jpg Air Intake Pic 3.jpg (68.9 KB, 119 views)
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post #19 of 75 Old 07-09-2010, 09:33 AM
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Interesting set up there shmup-o. I'll be curious to see how it works out for ya'!

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post #20 of 75 Old 07-16-2010, 12:33 PM
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When you guys have played around with the mod for a while, Can you let us know if the mileage improves or not

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post #21 of 75 Old 07-16-2010, 02:30 PM
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I havent noticed any change in the mileage, mind u I left the battery cover on.. Definitely like the look of the caliber one in the pics. Much nicer than the current intake/battery cov er lol... I just dont see how its that much different to the original piece in terms of function. The only big difference I can see is that the original piece has a lot of chambers either side of the main duct that would affect the flow of the air, but would it make a big difference?

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post #22 of 75 Old 07-17-2010, 03:31 AM Thread Starter
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i really like the look of that custon caliber piece, as for milage reference i ended up getting the k&n intake kit so im no longer in the box mod loop


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post #23 of 75 Old 07-18-2010, 09:50 AM
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i really like the look of that custon caliber piece, as for milage reference i ended up getting the k&n intake kit so im no longer in the box mod loop
So you still going with the Magnaflow? Great addition to the K&N if you do!

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post #24 of 75 Old 07-20-2010, 07:50 PM
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Ok! Just did this mod I must say that this is a great mod (Battery Cover and chamber piece removed).The sound isn't bad at all. The only loud part about it is when you accelerate really. And I think it definatly makes the engine sound a little bigger than usual. The acceleration felt that it had a little more kick to it as well. Thanks for the great idea!

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post #25 of 75 Old 07-21-2010, 03:03 PM Thread Starter
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hooray for free mods that actually create a differance


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post #26 of 75 Old 07-21-2010, 09:43 PM
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Today I put back on the Battery Cover and found that there was hardly a difference between that and with the chamber peice. I want to keep the cover off but I don't feel that it is that safe... wouldn't it lead to me having to clean the filter more? I don't think the chamber piece being off is a big difference, but to each his own. Maybe put the chamber piece back on and just remove the battery cover?

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post #27 of 75 Old 07-21-2010, 10:29 PM Thread Starter
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the inner chamber piece removed is the key to the increased airflow, keep that out and just use the battery cover. or put it all back together lol


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post #28 of 75 Old 07-22-2010, 06:48 AM
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Yeah I put the battery cover back on. I like the sound with it off but I am kinda paranoid about things getting into the airbox ... Anyway I would really like to hook that caliber mod up! Or maybe just mod the battery cover instead. Hmmmmm!

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post #29 of 75 Old 08-01-2010, 06:23 AM
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i took the baffle piece out and actually did notice improvement!

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post #30 of 75 Old 08-01-2010, 10:37 AM
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i took the baffle piece out and actually did notice improvement!
Cool, so tell us what are your results? I'm even beginning to see some folks do this with their trucks.

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