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Craig Stumph's RZR 1000 Build

19K views 64 replies 20 participants last post by  Rbloodhound  
#1 · (Edited)
Craig Stumph’s RZR 1000 build. This is my second RZR build and hopefully the best. My last build was a Jagged X. My first concern is safety, then performance and looks. This RZR will be built to handle extreme terrain as well as cruising with the wife. Extreme terrain will be the main focus. Trails such as Pritchett Canyon in Moab and the Hammers in Johnson Valley are the type of trails I like. The RZR will be built full competition legal for the Old School Rock Crawl and Rock Race as well as King of the Hammers. The vehicle will also be used for trail guiding at Ralley on the Rocks, The National ATV/UTV Jamboree, and Marysvale UTV Jamboree. The finished RZR must be able to conquer rocks as well as woops in the desert while being dependable enough to finish the King of the Hammers race. I ask a lot of a vehicle.

Step 1. Seats (PRP)
Step 2. PRP 5 Point Racing Harnesses (pg. 1)
Step 3. WE Shocks (pg. 1-4)
Step 4. WE Wheels and Maxxis Tires (pg.3)
Step 5. Trail Armor Skid Plate (pg. 4)
Step 6. Pawltector Park Brake (pg. 4)
Step 7. Desert Works Cage and Doors (Pg. 4)
Step 8. Seat Lowering Bases (pg. 4)
Step 9. Cool Belt CVT Cooling System by Pro UTV Parts (pg. 4)
Step 10. Ryco Street Legal Kit (pg. 5)
Step 11. Autotude High Clearance A-Arms (pg. 5)

PRP’s Grand Prix is my seat of choice for two reasons. One, they look nice and are very comfortable while being a suspension seat providing safety during rollover and high speed crash conditions. Two, they are good enough to be standard equipment in some Polaris vehicles so they bolt right in without any problems (see pics of the stock seat and the new PRP side by side). Feel free to let me know what you think of my choice so far.
 

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#6 ·
Looks good, I am with you on the stock cage. I just can't put my faith in it. Seats are going to be an issue with me, I am 6-4 about 270 and have more back problems than you can shake a stick at. Leaning towards twisted stitch, but haven't decided yet.
 
#8 ·
I had twisted stitch aggressors built with lumbar and 2" taller 1.5" wider for my list ride, a LT Teryx.
My problems are in the lumbar area too, but transitioning to thoracic.
 
#9 · (Edited)
Step 2. 5 Point Racing Harnesses

I have been in over 30 rollovers using the five point restraint system and have survived them all with only broken ribs and a concussion. A five point harness makes it more difficult to get in and out of the vehicle than the stock belts or the four point harnesses with automotive latches. Safety is my number one concern when doing extreme trails, racing, or jumping. PRP’s 5.3 padded racing harness is my choice for rollover protection for four reasons. One, they are comfortable. Two, they are race legal. Three, they are priced right for the protection and quality that is provided. Fourth, they match my seats.

The problem I encountered is that the crotch strap bracket when bolted to the metal under the seat hit the bar that holds the seats down and bends it. I bent the seat belt bracket a little with a hammer and now the bracket does not hit the bar. I used duct tape to keep the powder coat from being damaged by my hammer blows. A 1/4" self tapping bolt and a couple of washers were used to secure the crotch strap. Anybody else have a better solution?
 

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#11 ·
Using a spacer was another solution that I had considered. I was worried about the added leverage of the spacer on the bolt causing the belt attachment to fail in a roll over. Although I believe it to be an unlikely scenario. Good picture.
 
#12 ·
No more distance than the spacer creates I don't believe with everything tight there would be enough leverage on the bolt to shear or bend. If it was a 6" spacer I could see the problem because the moment would be moved out that far.

Good luck with your build, subscribed for updates.


KCCO
 
#13 · (Edited)
Step 3. Shocks

Having sold my Jagged X to buy a 1000 I was appalled with the handling of the 1000. My 1000 had the rear shock valving modified by Walker Evans when I received it. From past experience I was expecting great results from Walker Evans Racing. I am not sure what happened to my machine, but the difference between my 1000 and my old Jagged X was disappointing. I had ridden in a modified 1000 at the King of the Hammers Race (KOH) through a section of desert and was favorably impressed. The 1000 could go through the test section almost 20 mph faster than my Jagged X. My new 1000's back end bucks more than it should. The car also feels tippy around corners, and rides rough. In short my 1000 would only see the tail lights of my old Jagged X for a short time before the Jagged X was out of sight through rough terrain.

Enough of the whining, time to fix the problem since the Jagged X is being driven by my son now. I called the owner of the machine from KOH and started consulting with him to find a solution to the ill handling RZR 1000 sitting in my shop. I made some tuning changes in spring pre-load and clicker settings with some degree of success. The handling was still unacceptable. My next move was to remove the shocks from the vehicle and take the springs off. I called Racer Tech and ordered a set of heavy desert springs from them. The shocks were also sent to Holtz Racing to be re-valved. I don’t have them back yet and can not report on results yet. I measured all of the springs as shown in the photos for a beginning reference point. I have also included the stock spring rates as listed from various sources as follows:

Front Spring Stock- main 210 lbs. x 12.5” x 3”, Tender 165 lbs. x 6.5” x 3”
Rear Spring Stock- main 200 lbs. x 18” x 3”, Tender 100 lbs. x 6.5” x 3”
 

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#18 ·
Here are some photos of the Racer Tech springs, stock springs and Racer Tech Springs together, and as assembled on the WE shocks. The Racer Tech and Walker Evans springs are drastically different. These springs are the Racer Tech heavy desert package. I am starting at 1/2" preload front and 1.5" preload rear. I will post up pictures when I have the shocks mounted.
 

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#19 ·
will be very interesting to hear the springs lengths of the racer tech springs vs what the stock spring lengths are. I don't know if you will have the ability to test their spring rates, but I would be really intrigued to know what they are. Those tender springs from RT have to be pushing 200# rates judging by the coil size in the photos. And I would guess to say the RT rear mains are 14", and the tenders are 10".
 
#22 ·
Stock WE
Front Spring Stock- main 210 lbs. x 12.5” x 3”, Tender 165 lbs. x 6.5” x 3”
Rear Spring Stock- main 200 lbs. x 18” x 3”, Tender 100 lbs x 6.5” x 3”


RT Heavy Desert
Front Spring- Main 200 lbs. x 12” x 3", Tender 4" x 3"
Rear Spring- Main 300 lbs. x 14” x 3" Tender 10” x 3"

RT keeps the tender spring rates to themselves and would not tell me what they are. The front top tender is very stiff (>200 lbs.) and the rear tender is also stiffer than stock. At some point I will have the numbers.
 
#25 ·
I have set the front initial pre-load at 1/2" and the back initial pre-load at 1 1/2"at the suggestion of Chris Bullock. I used the two shock jam nuts to measure the 1 1/2" pre-load and ran shock spring tensioner nut down until I made contact with the jam nuts. I had to remove the front jam nuts to get the RT springs to work. I used some assembly grease on the orings when I put the shocks on. Unfortunately, I am missing one of the orings for the shocks. There were only 3 on one of the shocks when we took them apart. There should be four, two on top and two on the bottom. I had to order one oring from Polaris before I can install the last shock.
 

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#29 ·
Isn't the RT heavy desert rear spring setup similar to the rear XP1K4 setup ?[/QUOTE]

Completely different than stock springs on the four seater. The only difference on the four seat that I am aware of is the top tender spring is heavier (about 165 lbs. vs 100 lbs. on the two seater). Correct me if I am wrong on the 4 seat spring rates.
 
#31 · (Edited)
I have the re-valved and re-sprung shocks on and drove around the block to settle the springs. The height of the vehicle in the front was 15 1/8" and the back was 15 1/2" using 1/2" pre-load on the front and 1 1/2" pre-load adjustment on the back shocks. I removed half of the pre-load on the rear (3/4") and drove around to settle the springs. The new measurements after adjustments are 15 1/8" front and 14 3/4" rear. Chris Bullock is using a similar setup and he has a ride height of 14 1/2" in front and 13-13 1/2" rear. I believe that the difference in ride heights are due to weight that Chris has in his machine. He has tools, spare tire and a heavier aftermarket cage. My machine was empty with a stock cage. I am going to check the reference locations of where Chris is taking his measurements and double check my initial measurements.

The machine did seem more stable and smoother riding than with the WE springs and valving. I have a section of extreme whoops that I can test on to determine the effectiveness of the new spring and valving combination through whoops. I also have the Rock Cross track that OSRC uses for their rock race. The track has jumps, rocks, and hairpin turns that I will test on once I have the shocks dialed in with pre-load and clicker adjustments.
 

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