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Discussion Starter #1 (Edited)
Hey guys the more I read the more confused I get! I realize the 2008 RZR's have an air box concern with dust/sand getting inside and through the filter to the engine. I see all these mods and wonder why we can't stop the dust/sand at the intake or prior to reaching the filter? Now I'm not sure this will work (and perhaps it's been tried) or how long it will last before it clogs with dust but I purchased a simple Briggs air filter from NAPA for $3.00 and thought I'd try it prior to spending big money! Yea I know, the 5000 dollar motor or a 300 dollar air mod! Anyway, I cut the simple briggs filter in half, then cut the 2nd half of the half in half and rolled it inside the first half to come up with the desired size to fit the intake hole. I then put a small amount of oil on the filter to hold the dust and slid it into the intake. I started the rzr and test drove it and it seems to run normal "as in no loading up" and it idles perfect! So what do you guy's think? Has this been tried or am I beating another dead horse with this simple mod. Just trying to help save a buck and keep my motor safe. I'm open for criticism and hope to get some input back from you veteran RZR owners. Maybe this mod just isn't enough to fix the problem, or is it?
I also checked all of my conections and everything seems to be air tight. I clean my filter every 2nd ride even if it's not a dusty run so???
 

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Airbox isn't the problem. They actually work better than the ump in my opinion. The problem lies in the boot. That is where the dust is gettin in from. UMP fixes that problem.
 

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Discussion Starter #3
Airbox isn't the problem. They actually work better than the ump in my opinion. The problem lies in the boot. That is where the dust is gettin in from. UMP fixes that problem.
Thanks for the quick response moneypit! So what's a UMP and what boot are you refering to?
 

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I bet that'll be too restrictive off idle once you get some dirt in it. it also MIGHT even make dust in the throttle body worse if your clamps arent tight on the boot.
 

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Discussion Starter #5
I bet that'll be too restrictive off idle once you get some dirt in it. it also MIGHT even make dust in the throttle body worse if your clamps arent tight on the boot.
All my clamps seem to be tight. I just came in from a ride and it runs the same as it did prior to the install. If it does act up it's pretty simple to open the air box and yank the thing out. Just thought it would help keep some dust out of the box. I do worry some about it getting dirty fast but i check the air box every 2nd ride or 150 miles so time will tell! My guess is try it and see what happens???
 

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If it runs good and no air is getting past the clamps on the boot it sounds like a good plan.
 

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Airbox isn't the problem. They actually work better than the ump in my opinion. The problem lies in the boot. That is where the dust is gettin in from. UMP fixes that problem.
Thanks for the quick response moneypit! So what's a UMP and what boot are you refering to?
Here is the UMP

Ranger/RZR/Rhino/Teryx Offroad Parts and Accessories (alpinesandtoys.com) / UMP Intake for Polaris RZR & RZR-S & RZR4

The boot is the connection from the filter to the throttle body before the fuel injection.
 

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I Just cut a piece of air conditioner filter material & cut it 4 inches wide & the length required,oil it & stuff it in the air intake opening.It's amazing how much dirt it stops before entering the air box.I also use a AFE filter.Best one I've had yet.My clamps are kept tight.I also have the rear polaris rear panel with window.Its a must have to block dust in the cab.No dirt found in my intake.
 

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so the way dust is getting in is by a loose connection from the rubber boot on the throttle body?
 

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Discussion Starter #10 (Edited)
I did a 20 mile run yesterday in extremely dusty conditions and checked the air box this morning. The briggs filter was pretty dirty and the box was clean. I cleaned the briggs filter and soak it in more oil this time to see how well it performs on my next run. I'm not sure the briggs filter could handle an all day run or say 150 miles of dusty trails/roads without getting overly dirty and causing a performance issue but it sure traps the fine dust! Overall I'm happy with the outcome. I think my next step will be to improve on the inline filter without the intake going into the cab like some of the other mods I've seen. I think those are great ideas but I don't want the cab noise from the intake! My rzr cab noise seems a little quieter with the inline filter in place. I do have a top with the full windshield and a nylon rear cab with a window which I feel traps the engine noise inside. Still room to improve but trying to keep some gas money in my pocket!
 

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I took care of my problem just by sealing the intake boot. I took and ran a small bead of silicone gasket maker around the inside of both ends of the boot. This seals the boot to the intake and the air box. I have over 300 miles of very very dusty riding and have no dust getting into the intake.

This is just my simple fix and it really has seemed to work very well.
 

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I was looking at my stock ('08) air box. I did the boot upgrade. Many have said the motor moves, and the box is stationary to the frame, then allowing dust intrusion. I have noticed that the airbox 'wiggles' excessively, since it is only mounted with one thin bracket. The motor moves minimally in its mounts. If the airbox is mounted more solidly, there is less movement between TB and airbox. Does this make sense? Any thoughts?
 

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I did new clamps, updated boot,updated lid/bigger filter,outerwears prefilter.
At 900 miles...new top end! Ran good but burnt oil enough to have to add between changes at 25 hrs..
So fix the boot problem or fix your motor later. My wifes 09 with 18 hrs on it had dirt in the TB. She just cruises hers unlike me. My buddy had 90 hrs on his and it was like 4o grit inside his. My filter/box was always clean as I cleaned it after every weekend. I never had dirt past the filter and thought I had fixed the issue. I even had a prefilter between the seats at the inlet. As far as movement goes have someone put it in gear from D to R and give a little gas. You will be amazed at the movement, x's that by 40 +mph and throw in some whoops and imagine the filter box not moving at all.....
So...good luck.
 

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just sayin, it looks looks the box was moving over 1 inch, add 1 inch to the motor, that's 2 inches of movement at a boot.

Moneypit, what did you do to fix yours? Aftermarket filter kit? Has anyone fabbed a bracket to the tranny for the stock box?
 

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Has anybody throught about getting the filter set up that polaris uses on the ranger.
the one from the range has the air intake up front by the headlight then goes thru a tube to a baffle box and the into the air filter canister before going into the tb of the rzr. not sure how much all the parts would cost but talking to my dealer he says he has guys running the ranger for over 3000 mile before needing an air filter change
 

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and my dealer told me there was no problem with rzr intake... Ill bet he told you he'de install it for a price too :)
 

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Discussion Starter #19
Dirt in the air box is what its supposed to do, the filter keeps it from going further, i use a prefilter on mine and zero issues on my 10 or new 11.
I agree 100%! Just trying to keep the dirt in the box to a minimum! I'm now thinking about a better filter in the box. I'm open to suggestions as to what's the best??? I think I'd prefer a cleanable filter oposed to a paper like the stock unit as I check and clean the box often.
 

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I was looking at my stock ('08) air box. I did the boot upgrade. Many have said the motor moves, and the box is stationary to the frame, then allowing dust intrusion. I have noticed that the airbox 'wiggles' excessively, since it is only mounted with one thin bracket. The motor moves minimally in its mounts. If the airbox is mounted more solidly, there is less movement between TB and airbox. Does this make sense? Any thoughts?
You'd be amazed how much these motors move around in the mounts, which is why I will be getting the Holz mounts. People that have seen theirs run on a dyno will tell you they were surprised when they saw how much movement there is.
 
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