Polaris has a serious design flaw with the 2008 RZR's air filter system. There is not enough volume of air coming into the airbox to meet the damand of the engine under hard acceleration. This puts a negative (Vaccum) pressure inside the air cannister literally forcing dust through the filter and into the motor..Both these machines have lost compression...

http://www.youtube.com/watch?v=ft6XLGlL_J0

http://www.youtube.com/watch?v=u10CCed2vtE

been there. had motor fixed after 20 hours, warranty work. installed UMP filter box with Donaldson filter.

http://i134.photobucket.com/albums/q97/megadesertdiesel/4-8-08011.jpg

http://i134.photobucket.com/albums/q97/megadesertdiesel/4-8-08006.jpg


btw. eff DF Racing

Are all of the 2008 RZRs affected, or just up to a certain build date?

The problem isn't with the air filter, it's the inlet design and location. My recommendation would be to get Dirty Dawg Performance's Big Air Kit, which I've been running with no problems on my race RZR in the harshest of conditions. It fixes all problems with the stock design.

Chris

Does this effect rangers or just razors

Ok, I just checked my air box on my RZR and was not happy. :mad3: The build date on my RZR is 03-01-08. Polaris did not fix this problem thoroughly according to their TSB. I only have 4 hours on the vehicle which was one day's ride last Sunday. Conditions were not dusty at all, even had a slight drizzle throughout the day which kept the dust down on the trails.

To make a long story short, I pulled out a rag with dust on it and could visibly see the dust in the throat of the airbox down to the throttle body. :mad3: Even with the conditions not very dusty, I was in awe to see how much dust was in there.

To the OP, thanks for the heads up. I never heard of this until now. I am just glad I became aware of this around 4 hours and not 25+.


been there. had motor fixed after 20 hours, warranty work. installed UMP filter box with Donaldson filter.

How is the filter working out for you? Is it effective in eliminating the sucking dust issue? How expensive are the replacement filters? It sounds like the UMP is the best way to go. Any cons?

TIA for the info.

If you want a fix that works and is fairly inexpensive, call Dale Hilton @ Dirty Dawg Performance.

Chris

If you want a fix that works and is fairly inexpensive, call Dale Hilton @ Dirty Dawg Performance.

Chris
Do you know of any pictures out there of the Dirty Dawg Performance air intake installed ?

http://www.dirtydawgperformance.com/IntakeKitProductPage.htm

Do you know of any pictures out there of the Dirty Dawg Performance air intake installed ?


I found a couple of threads:

http://www.prcforum.com/viewtopic.php?t=7231

http://www.prcforum.com/viewtopic.php?t=6036

thanks for the link for an installed picture, looks kind of like an inexpensive variation to the ESR box,

I know Bob at Factory UTV is also designing an alternative to the factory air box/air filter issue ,it should be out shortly, I'll have a look at that one too,
Thanks,

Look at this..
http://www.youtube.com/watch?v=Zitzm-ZwZh4

Ok, I just checked my air box on my RZR and was not happy. :mad3: The build date on my RZR is 03-01-08. Polaris did not fix this problem thoroughly according to their TSB. I only have 4 hours on the vehicle which was one day's ride last Sunday. Conditions were not dusty at all, even had a slight drizzle throughout the day which kept the dust down on the trails.

To make a long story short, I pulled out a rag with dust on it and could visibly see the dust in the throat of the airbox down to the throttle body. :mad3: Even with the conditions not very dusty, I was in awe to see how much dust was in there.

To the OP, thanks for the heads up. I never heard of this until now. I am just glad I became aware of this around 4 hours and not 25+.




How is the filter working out for you? Is it effective in eliminating the sucking dust issue? How expensive are the replacement filters? It sounds like the UMP is the best way to go. Any cons?

TIA for the info.


my UMP works great no dirt into the engine. not sure about replacement filters but they are Donaldson filters and just blow off the dust and replace.

remember its all about keeping dirt out of the engine, to prolong its life.

my UMP works great no dirt into the engine. not sure about replacement filters but they are Donaldson filters and just blow off the dust and replace.

remember its all about keeping dirt out of the engine, to prolong its life.


Good to hear. I ordered the UMP at the end of last week. It should be here within a day or two. Can't wait to install it and get back on the trails. Thanks for the info!

Guys, the filters won't fix it...you need a complete kit like Dirty Dawg's to prevent this from happening...period.

Chris

Guys, the filters won't fix it...you need a complete kit like Dirty Dawg's to prevent this from happening...period.

Chris

:confused: Why?

The UMP is a complete kit and replaces all the stock junk.

http://www.utvguide.net/images/PolarisRZR-UMP-2.jpg

Are you referring to the airbox between the seats not being able to flow enough air causing this "mysterious" vacuum? According to UMP, increasing the intake hole up there is only going to make it louder and do nothing for performance or vacuum for that matter. They state the primary air box slit flows plenty with no need to modify. As far as dirt getting past a Donaldson, I have read that they are the same paper type that is used on heavy equipment. Explain why the UMP will not fix the issue:confused: Maybe I have been misinformed.

Not sure on the UMP kit, because they're normally really good, but it's the design of most systems are only a bandaid fix. The problem is recirculating air and that's why by having the pre-filters from dirty dawg on the intake tube itself prevents the problem. most other kits leave it off, which then causes the stock filter or aftermarket filter to still be introduced to too much crap through the intake tube, not fresh clean air like a normal intake. It's not the filter but rather the design of the intakes that causes the air that's entering the filter to be more dirty than normal.

Chris

Not sure on the UMP kit, because they're normally really good, but it's the design of most systems are only a bandaid fix. The problem is recirculating air and that's why by having the pre-filters from dirty dawg on the intake tube itself prevents the problem. most other kits leave it off, which then causes the stock filter or aftermarket filter to still be introduced to too much crap through the intake tube, not fresh clean air like a normal intake. It's not the filter but rather the design of the intakes that causes the air that's entering the filter to be more dirty than normal.

Chris

Gotcha. I will keep a close eye on the system with the UMP. If I see any dust after the intake swap, I will try the dirty dawg kit. What you are saying makes sense. Thanks for the info.

No problem...UMP usually does a good job, but from the looks of it it mimics the stock setup.

Chris

The UMP kit is very nice. Bolts up nicely and everything seems to work well so far.

More info:
UMP RZR Air Filter kit (http://www.utvguide.net/rzr_air_intake.htm).

Does anyone know if this is also a problem on the Rangers?

Has anyone gotten the letter from polaris yet about an upgrade/

Rangers are not affected.

I got a letter about the new air filter. Already got 2 of them in the mail.
Is there another letter?

I also got a letter and my filter is on its way.

I guess it is for the new air filter. Does it appear to be redesigned? I havent seen the letter, I just got the memo about the letter.

No, the new air filter is larger in diameter, had no prefilter/outerwear and instead of a hose clamp, they have a plastic band on there.

Looks to be the same paper type media, and the lid still holds it on.

The problem is where the filter gets its air. Snorkel the intake so it gets clean air and you'll fix 90% of the problem.
I run a snorkel for crossing rivers ,And have no problems with dust getting past the air filter. I did silicone the cover of the intake on though, I don't trust those little clips.

http://i58.photobucket.com/albums/g260/redstang410/rzr/DSC05202.jpg

The intake is the left tube sticking out between the seats. The other 2 tubes snorkel the belt cover. You can tell the intake tube is clean, even after a dusty trail ride.