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MRZR 4 advice needed

12K views 27 replies 8 participants last post by  rogerfierro86  
#1 · (Edited)
I work for a small law enforcement department that spends a lot of time in RZRs. We have four currently. We have a 2012 RZR 800 two seater, a 2016 RZR 1000 4 seater, and 2 MRZR 4 seaters.

Our area of patrol is in the mojave desert. Terrain is varied from flat open dry lake beds, twisty dirt trails, and rugged, rocky hills. Most of the King of the Hammers race course is within our jurisdiction, and we have smaller events that we also assist with.

Due to maintenance and repair costs, each officer is assigned a RZR and a small annual budget . The RZRs that we have already have some modifications for our use, but further modifications and repairs come out of each officers assigned budget.

I have been assigned one of the MRZR 4s. It has lights and sirens installed, a venturi style precleaner, stage 2 cam, controller, upgraded exhaust, a mud clutch, and aftermarket half shafts (Moose ?)

I have identified several problems with my MRZR that I would like to address, and any advice from anyone with in depth knowledge would certainly be appreciated.

Ground clearance: These are low and narrow. In any real terrain variation I am dragging the skid plates or rock rails. The stock tires are all 26x9x14r. We have increased tire height and spring preload to try do address this, but this has added a new set of issues. The ground clearance is noticeably better, but it hops like a pogo stick on whoops, and the increased sidewall seems to make bodyroll and under steer worse than before. Driving at speed is tricky enough without the added unpredictability.

Weight: This MRZR feels sluggish and heavy. Even with the engine upgrades, it is challenging to push across terrain. I am considering removing things like the tailgate, rock rails, and going with a different roll cage and bed to shed some pounds.

Track width: The stock tires are all 26x9x14r. The military desired that all four tires be interchangeable, and needed a narrow track width with a collapsible roll cage in order to load it aboard an osprey. We do not have the same requirements, and both the 800 and 1000 handle curves far better than the MRZRs.

Oil consumption: The MRZRs drink around a quart a day. That seems extremely high to me, and the oil fill is located under an access panel that has to be removed in order to top it off. Easier access would help, but much lower oil consumption would be preferred.

Fuel consumption and range: The tank is 7.25 gals, and we carry an extra 5 gallons in mounted fuel cans. Depending on cargo and speed, range can vary greatly.

Forward visibility: The collapsible roll cage has a front spreader bar that goes right across the sight line of the driver, and cuts off vision at times of approaching obstacles. A small windshield of some sort would also be nice. We are considering putting a small piece of Plexiglas in.

I appreciate any help or advice, thanks in advance
 
#3 ·
Hi there, first off your lucky you get to patrol with a RZR in the open country .... thats super cool

After reading your impression's on your MRZR4 I would def suggest some upgrades for your machine

1/ Better suspension to handle the vehicles weight and terrain, I would contact Shock Therapy on this forum, they can set you up custom sized/weight springs and shocks to properly handle the weight of the vehicle, you will also regain a lot of ground clearance and you will not have to remove any protective parts to save weight. Proper suspension will get rid of the body roll and unpredictability, Shock therapy also has an upgraded sway bar system that would help out a lot in faster situations. Suspension upgrades are expensive but many RZR owners will tell you it is hands down the best upgrade for a comfortable and capable machine
Shock Therapy - The Primier Suspension Tuning Company

2/ Better tires .... 26 inch is wayyyyy to small for terrain like that. I would go with a minimum of a 32 inch tire and probably a light truck tire instead of a UTV tire, truck tires are much tougher and last a lot longer but you need a 15 or 16 inch rim to mount them on.... there are lots to choose from BFG, General, ect..
I would keep the same width of tire all the way around so you only need one spare. For track width you can get a higher offset set of wheels that will push them out a bit further 4+3 offset will work, I'm sure the stock wheels are prob low offset to fit in the chopper

3/ Oil and fuel, how many hours on the motor? depending on the hours you motor could be suffering from high hours in a super dusty environment that slowly "dusts" a motor, wears the rings down and lowers compression so the motor feels weak and will burn extra oil (oil slipping past the rings) so it may just be getting up there in hours and wear

Fuel, There is a few ways to extend range I would really consider installing a second fuel cell/tank if you can find a good spot, allows you to carry more fuel in a safer manner, gas cans can be dangerous in a roll over event
IMS Products : 2014-2017 Polaris RZR 4 1000 5.0 gal Fuel Tank
https://www.harmonracingcells.com/polaris-rzr-xp1000.html

Good luck and be safe out there
 
#4 · (Edited)
Thank you for your response. I was starting to think I shouldn't have mentioned the whole law enforcement thing...

1. I'm pretty sure the shocks are Fox with remote reservoirs. I think they are probably pretty good considering. I will contact them and see. I was hoping to maybe find a long travel arm kit that would work with as much as possible to keep cost down.

2. Current setup is 14 with beadlocks. I am thinking upgraded tires and rims will be a given after I get the suspension figured out. We got a total of three flats during KoH due to pinched sidewalls. Will a taller tire rob power? Not sure if "regearing" is even possible with a CVT...

3. Unsure about hours / miles. I will check on that nest time I work.

4. I like the idea of a fuel cell now that you mentioned it
 
#5 ·
Hey, no worries ... you have a tough job and many people respect that

The fox's should be good.... but a set of aftermarket springs tailored to the weight of your vehicle with all the added weight of gear, radios, sirens, extra fuel ect...will make a huge difference in handling and is a lot more cost effective than a full shock replacement. Long travel kits are nice but pretty expensive and usually require new axles and longer shocks.... would be the way to go if it was in the budget.

A taller tire should be OK since you have and upgraded clutch ...but they will rob a bit of power, you may have to re-clutch it for really big tires but should be OK to start with on you mud clutch. There is gear reduction kits out there for when you have really big tires but may not be needed in the open desert ... unless there's lots of slow rock crawling involved but its a full transmission rebuild to install.
https://www.superatv.com/transmission-gear-reduction-kit-rzr-1000
Optimum Offroad - Home
 
#6 ·
We got the MRZRs because they were free and donated to us. Our individual RZR budget isn't much, and also needs to cover repairs and service, so I need to watch every dime of it and I may need to upgrade in stages, over time.

Is there a reputable long arm kit you would recommend? Roughly how much would one cost?
 
#7 ·
We got the MRZRs because they were free and donated to us. Our individual RZR budget isn't much, and also needs to cover repairs and service, so I need to watch every dime of it and I may need to upgrade in stages, over time.



Is there a reputable long arm kit you would recommend? Roughly how much would one cost?


HCR makes a good kit. However long travel introduces a whole host of problems if you are trying to keep cost down haha. Longer tie rods, half shafts, and depending which route you go, different suspension. I know HCR has a long travel kit that addresses all these areas, but it’s a pretty penny. Cool idea of building a Military RZR like that, maybe some companies would like to get involved. Worth a shot. Good luck with the project.
 
#8 ·
I'll second the Shock Therapy upgrades, they were the best mod I did to my 2016 XP4 Turbo. Significant improvement to the ride and handling.

Tires: I agree with Dirt-Monger, you need a larger tire; fortunately, there are better tires that will fit your existing 14" beadlock wheels. I'd check out the Motorace tires. FJK (Site Admin) uses them with great results; most of his riding is in the NM desert.

MotoRaceTire.com ? Best ATV and UTV Anti-Puncture ? Kevlar Triple Belt Race Tires

Clutch: Already having a clutch kit helps; Todd at Hunterworks is an excellent resource as well as CVT parts source. I'm sure he can provide some direction to tune your CVT to your needs.

Polaris RZR XP 1000 900, Polaris Ranger 800 - Yamaha Rhino Performance Accessories Teryx Kawasaki Teryx, Can Am Commander Maverick, Polaris RZR XP 900

Axles: These are the heaviest duty axles I've seen.

https://www.turnercycles.com/turner-axles
 
#13 ·
I'd give Shock Therapy a call. I did and found their advice invaluable as they helped me determine which of their upgrades would be best for my style of riding. I ended up with their Level 3+ spring kit; plus they installed it at Glamis while I was there over Halloween. I had expected to need valving changes, but their spring kit does exactly what I needed it to do without the expense of valve work.

I understand it may not be possible to bring your machine to them, but you can send them your shocks without going through a third party vendor. Might save some money and time.

As you've found out, adjusting the pre-load doesn't always give you what you are looking for. When I used to race, I used to set my pre-load by unloading the vehicle by getting it completely off the ground so the shocks were in full droop, then loosened the pre-load collars completely. Then tighten it to where the collar just touched the top of the spring and go one additional turn; called it good. It worked great and set my ride height where I needed it.

Weight: Would be good to know, for you and whomever does your shock work, to know how much it weighs. They can make a better recommendation as to what you'll need.

I took a look at some photos of a MRZR; there is definitely opportunity to put it on a diet.

My recommendations:

The running boards/nerf bars could go. If you don't need something to stand upon or for ingress/egress, I'd replace them with another brand of rocker protection. Lots of options in the marketplace. Lighter and still provides protection.

Roll cage: If you don't have a need to airlift it or stack it for storage as the MRZR cage is designed for, get an aftermarket cage, tons of vendors make them. Be prepared, it's a job to change one out, if you do the job yourself; in my experience.

Under vehicle skid protection? Not sure what's on MRZR, but there are lighter and very durable products available. UHMW is what you want.

https://www.factoryutv.net/product-category/accessories/uhmw/

Cool patrol beat you've got, BTW!
 
#19 · (Edited)
Thanks for the pics!

Thought the revised clutch cover would work for your machine OfficerFriendly, but I've learned it will not.

Might look into the products DesertCraft offers. You need more airflow thru the clutch.

Another item for your wish list: Polaris has a retrofit clutch cover kit for the 2014's to bring them to 2015 standards.

P/N: 2205862

Kit includes:

Drive belt - 3211180
Clutch cover
Frog Skin covers - intake
Intake tubes
Mounting hardware
 
#20 ·
Thanks for the pics!

Another item for your wish list: Polaris has a retrofit clutch cover kit for the 2014's to bring them to 2015 standards.

P/N: 2205862

Kit includes:

Drive belt - 3211180
Clutch cover
Frog Skin covers - intake
Intake tubes
Mounting hardware
You sure? His clutch cover tubing looks completely different than an xp1000. Looks to me like his inlet tube is further back and going upwards.
 
#26 ·
just wanted to keep everyone up to date. We had two sets of tires donated to us for testing and evaluation by https://www.pitbulltires.com/ so we have them mounted up and some custom OMF beadlocks. We should be getting both of the MRZRs back soon. Then Justin and Shock Therapy is going to dial in our shocks so that they ride and handle better. Thanks to everyone who helped out with suggestions. I will try to post up some photos when they are complete
 
#28 ·
I work for a small law enforcement department that spends a lot of time in RZRs. We have four currently. We have a 2012 RZR 800 two seater, a 2016 RZR 1000 4 seater, and 2 MRZR 4 seaters. Our area of patrol is in the mojave desert. Terrain is varied from flat open dry lake beds, twisty dirt trails, and rugged, rocky hills. Most of the King of the Hammers race course is within our jurisdiction, and we have smaller events that we also assist with. Due to maintenance and repair costs, each officer is assigned a RZR and a small annual budget . The RZRs that we have already have some modifications for our use, but further modifications and repairs come out of each officers assigned budget. I have been assigned one of the MRZR 4s. It has lights and sirens installed, a venturi style precleaner, stage 2 cam, controller, upgraded exhaust, a mud clutch, and aftermarket half shafts (Moose ?) I have identified several problems with my MRZR that I would like to address, and any advice from anyone with in depth knowledge would certainly be appreciated. Ground clearance: These are low and narrow. In any real terrain variation I am dragging the skid plates or rock rails. The stock tires are all 26x9x14r. We have increased tire height and spring preload to try do address this, but this has added a new set of issues. The ground clearance is noticeably better, but it hops like a pogo stick on whoops, and the increased sidewall seems to make bodyroll and under steer worse than before. Driving at speed is tricky enough without the added unpredictability. Weight: This MRZR feels sluggish and heavy. Even with the engine upgrades, it is challenging to push across terrain. I am considering removing things like the tailgate, rock rails, and going with a different roll cage and bed to shed some pounds. Track width: The stock tires are all 26x9x14r. The military desired that all four tires be interchangeable, and needed a narrow track width with a collapsible roll cage in order to load it aboard an osprey. We do not have the same requirements, and both the 800 and 1000 handle curves far better than the MRZRs. Oil consumption: The MRZRs drink around a quart a day. That seems extremely high to me, and the oil fill is located under an access panel that has to be removed in order to top it off. Easier access would help, but much lower oil consumption would be preferred. Fuel consumption and range: The tank is 7.25 gals, and we carry an extra 5 gallons in mounted fuel cans. Depending on cargo and speed, range can vary greatly. Forward visibility: The collapsible roll cage has a front spreader bar that goes right across the sight line of the driver, and cuts off vision at times of approaching obstacles. A small windshield of some sort would also be nice. We are considering putting a small piece of Plexiglas in. I appreciate any help or advice, thanks in advance
Can you order mrzr parts? I bought some beadlock rims and I just broke one but I cant seem to find any unless I have a gov contract.