have had a UMP on my S for about 200-300 miles, got it sometime last season. haven't opened it yet. figure i might do that today. No issues to speak of with it.

 

Sorry to say I clean mine after every ride the rides range from 40 to 50 miles and I get a about a half shot glass of dirt or dust .But Im riding in the dezert not the sand of dumont. I have had no problems with dirt getting past the ump. I hope this info helps.

 

So what is the issue with dirt being inside the airbox? If you don't have a pre-filter installed, your probably going to have the same amount of dirt inside the box if the intake is pulling air from the same location?

 

Its not so much of an issue with dirt in the airbox itself, but the filters were sooooo dirty after every day of riding. I would blow them off with light air pressure, but I wanted to just put a new one on. They dont come clean hardly at all. From what ive been hearing, the filters in the UMP system stay clean for so long, I can stand to not have to service them for a full rental period of 4 to 5 days.

 

I ran my UMP for a year on the sand, no issues. I only blew it out one time, and it didn't even need it. Every time I checked it still looked like new. I think it was actually 13 months before I changed it, and it didn't even need it then.

 

same here i just replaced mine after 1 yr

 

I have also just changed my UMP filter after a year, wasn't even that dirty. And yes, those bolts by the shifter linkage are a pain...

 

Where did you find or what UMP system did you put on your RZR's?

 

Do these UMP systems help or hurt performance? My dad just installed his and it feels like there is a lag time between the time you floor it to the time the rzr takes off or accelerates. WTF!

 

I never felt any loss of performance at all, you may have something else going on.

same here...feels like after i installed the ump system my performnace has suffered a bit..doesnt seem to have as much seat of the pants feel on take off..is a programmer required with just the ump system with no other performance mods??

No programmer required.

 

same here...feels like after i installed the ump system my performnace has suffered a bit..doesnt seem to have as much seat of the pants feel on take off..is a programmer required with just the ump system with no other performance mods??

 

Never heard of any perfomance issues with the UMP, mine has been on about 900 miles.

 

The ump uses a good filter,they do not need to check the filter.

 

I have checked mine every 100 miles or so but it always looks great. In the end I now just change the filter every year and call it good.

 

Where are you guys bying your filters for the UMP :question:

 

Alpinesandtoys.com

 

Okay so after our first glamis trip im pretty sure the UMP has a negative effect on performance. My razor with a heavier cage and stock intake blows my dads razor away in hill climb and a drag race.

 

What year is yours and what year is your dads ???? Maybe that might have something to do with it ????

 

im fixing to order this ump setup, deff want to know whats up

 

Mine is an 09 S and his is a 2010 S. I thought ahead on that one and jumped in my sister's 2010 razor S. air pressure, passenger weight both in 2 wheel drive on the straight and 4 wheel drive on the hill climb everything was the same with the exception of the UMP. Both bone stock machines. Idk if maybe my dad mest up the install or what but there was a noticable difference. There was one hill that my dads didnt even make it up and my sisters did no problem.

 

Just Snorkel them, add a pre filter and outwears and forget about it...

 

I have an 08 standard rzr with extra weight and am just as fast up the hills as a friends 10 rzr s with a slip on pipe and k&n. The UMP is the only "performance" mod on my rzr.

 

Yeah thats what I dont get. I recently added a cage to my 09 with no engine mods and Im still runnin faster than my dads 2010 razor with nuthin but a ump. My sisters bone stock 2010 is the fastest of the three. I was thinking that maybe he made a mistake with the install or somethin. I dunno.

 

well I really dont think the ump hurts the performance. I just had a renter tell me our rzr4 was beating rzrs's and rzr4's out at dumont over the weekend. Ours is the 2011 with an UMP.. I really think performance is different for every machine. I personally thought our 2010 rzr4 felt quicker than our 2011 rzr4, but the guy who rented asked me what I did to it to make is so fast... and yes, the UMP will fit the 2011.. you just need the plug the hole the sending unit used to go in, as they moved in in the 2011's. I just used a bolt with washers on each side.. seems to work just fine

 

Vegastoys, you may have gotten one of the last kits w/out the plug...I just got more kits in and haven't opened the boxes up yet, but was told by UMP that they're all coming with a new plug for anyone with a 2011 model. If you need a plug let me know and I'll send one your way.

I've installed several of these kits and have one on my 2009 RZR S (otherwise bone stock minus removing the exhaust ring) and we've seen no performance decrease. I wonder if your dad's RZR isn't getting full throttle opening? There was a post about this somewhere......

Also, the ejector valve on the UMP system will evacuate a LOT of dust and dirt out of the canister. It's all about the fin system on the Donaldson swirling the particles in there (I would be careful of using any other paper filter in the UMP setup). Without that ejector valve, you will end up with a dirty filter as quickly as the stock filter system gets. If you put your finger over that valve and give it some throttle, you'll feel it pushing air out.

I have replacement Donaldson filter's and the UMP system at the bottom of THIS PAGE