PROJECT MACHINE: KUMBUSTION MOTOSPORTS RZR XP 4 1000

All-around rock monster By the staff of Dirt Wheels

It is nice to have options. Ryan Flanders does. As co-owner and CEO of Kombustion Motorsports in Murray, Utah, it is vital that he owns a very cool UTV that is totally built. Kombustion Motorsports is a full-service shop that can serve as a destination to gather parts to build your own machine, or be your one-stop shop for a complete, turn-key build. This monster RZR XP 4 1000 began as a routine 2014 model in Titanium Matte Metallic, but it didn’t stay that way for long. Flanders arrived at this present state of build over the two years since the machine was new. He kept the motor stock internally and concentrated on making the machine superb in other areas to make the RZR a perfect weapon for his sort of fun.

 

The combination of a whopping 8 inches wider than stock and monster 35-inch CST Lobo sticky tires make for effortless rock crawling.
The combination of a whopping 8 inches wider than stock and monster 35-inch CST Lobo sticky tires make for effortless rock crawling.

 

Flanders really likes showing up everybody around on the slick rock that makes up many prime Utah ride destinations, and his RZR build certainly emphasizes that aspect of this car, but he kept it an all-around car as well. You see, many of those same slick-rock fun zones that Flanders craves have ample quantities of fine sand in between. The car has also seen some duty in Mexico. As you peruse the parts list you will see that this four-seater has a Utah street-legal kit on it so Flanders and his better half, Kirsten, can even do some local pavement cruising in it.

HOW IT HAPPENED

A two-seat RZR 1000 looks lean, mean and ready for action just sitting still. Add enough wheelbase to fit a second row of bucket seats and the longer machine looks lower, more sedate and like the wheels are half the size. Beauty is in the eye of the beholder, and if you have a family, one RZR with four seats is vastly more beautiful to the bank account than a matching pair of two-seaters. Being in the UTV biz and having a background in design, Flanders no doubt considered the look of his RZR, but the rowdy, mean and massive look of this four-seater came as a result of adding performance.

 

Flanders stayed with the stock exhaust for this super-wide machine. If he wants it loud, he can crank the award-winning stereo system up.
Flanders stayed with the stock exhaust for this super-wide machine. If he wants it loud, he can crank the award-winning stereo system up.

 

Massive, 35-inch CST Lobo RC tires on 17-inch STI HD4 wheels that are 7 inches wide are a huge part of the car’s aggressive and purposeful looks. Those tires are on narrower rims than stock, but are a full 6 inches taller than the stockers, and the tires mount on 17-inch rims as well. At the time of the test, these tires with the cool large-colored lettering on the sidewalls, were just about to hit stores. This tire is called a “gummy,” meaning that they are sticky for maximum traction on sandstone or other rock, but the tread does wear. The closely spaced tread and narrow rear tires and rims (compared to the stock 29×11-14 tires) don’t allow the car to lunge forward in sand and mud like the stock multi-purpose tires do.

 

Ryan Flanders wasn’t bashful about tossing the XP 4 into turns in the sand. With the car being so wide, it wasn’t surprising that it stayed completely composed.
Ryan Flanders wasn’t bashful about tossing the XP 4 into turns in the sand. With the car being so wide, it wasn’t surprising that it stayed completely composed.

 

GO WIDE, YOUNG MAN

While the tires are 6 inches taller, the Reflex 8+ suspension kit, 4+ Rhino axles and SuperATV boxed A-arms make the car a full 8 inches wider than the stock 64-inch-wide RZR XP 4. According to Flanders the suspension travel is the same, but the wider car and sticky tires stick to rock sidehills like a giant spider. The soft, articulated ride isn’t the best for whoops, but the car still gets through them very well, but for rocks and general desert terrain Flanders’ rock masher rides like a dream. The large-diameter tires do require that a great deal of driving is accomplished in low range. Flanders claims he doesn’t use the high range much unless he is going downhill or is traversing packed dirt or paved surfaces. Gearing was still low enough for serious rock crawling. From a distance the slick rock looks relatively smooth, but gaps in the rock ranging from the size of a residential bathtub to the size of a good-sized hot tub are just minor hiccups; as long as you keep one side of the car on solid terrain, the other side will float the huge gaps. Rock crawling is a different kind of thrill. Your heart rate will definitely feel it, and most of the time the Polaris speedo is barely reading any speed!

 

We didn’t drive the XP 4 at night, but it looks like it has plenty of available light. The short windshield was nice, and the Assault mirrors were very welcome.
We didn’t drive the XP 4 at night, but it looks like it has plenty of available light. The short windshield was nice, and the Assault mirrors were very welcome.

 

Many of Kombustion’s other mods to the suspension were to increase clearance to make the car bulletproof while crawling rocks. On top of those mods, Kombustion fitted its own UHMW full skid plate with A-arm and trailing-arm guards, along with RSK rock sliders. RSK handled the rear bumper, but an Assault Industries bumper is used in the front.

 

This slick panel in the cockpit gives the driver total control of the lighting options.
This slick panel in the cockpit gives the driver total control of the lighting options.

 

PEOPLE NEED PROTECTION TOO

A good deal of time, energy and money was committed to keeping the people inside the machine comfortable, safe and entertained. A custom Assault Industries roll cage was added for protection, but it has an integrated roof with a built-in sunroof. Flanders saw no reason to replace the stock seats, but each seat gets Pro Armor harnesses. Pro Armor continues the protection with full doors replacing the four stockers, and you definitely feel like you are securely inside the machine.

BUMPER

If you need more than the scenery to interest you, Kombustion added its signature stereo system. The system in this car won Best Stereo at the 2014 Rally in the Rocks. It consists of a seven-speaker system with six 6.5-inch Kicker LED speakers in front, SSV enclosures and rear Kicker pods. There is a 10-inch Kicker LED sub with SSV rear sub box, a JVC Powersport head unit with remote and a 950-watt Kicker Marine five-channel amp. It sounds great no matter how fast you are driving.

 

With the tall, relatively narrow tires and closely spaced tread blocks, you would think the Kombustion car would be a handful in the sand, but it worked well.
With the tall, relatively narrow tires and closely spaced tread blocks, you would think the Kombustion car would be a handful in the sand, but it worked well.

 

BEHIND THE WHEEL

We rode in the car with Flanders at the wheel, and even with all four seats full, the Kombustion XP 4 is truly amazing. Obstacles that looked daunting were easy, and what looked impossible took a bit of thought. Actually, we were happy to ride in the passenger seat for much of the day. Riding with a confident crawler with a well-setup car will give you a much better idea of what the car is capable of and how much traction is available on the unique rock surface.

We feared that the long-wheelbase XP 4 would be a handicap, and that the skid plate would be getting a workout, but Flanders explained that usually the four-seater is an advantage. It allows the car to stretch between obstacles better. Watching Flanders drive in the company of other two-seat RZRs, it was clear to see that he was correct. Sure, the sliders and skids did have some work to do, but not as much as we thought they would.

Driving the car is a genuine pleasure. With Flanders in the passenger seat coaching, we crossed and climbed things we would never have attempted. Huge stair-steps are easy. During one stair-step climb we could keep the left-side wheels on somewhat drivable rocks, but we had to float the ride side over a hole the size of a hot tub! It was no problem. After the rock we headed off into the sand. The wide car is very comfortable, and there is ample performance, though (as expected) the relatively narrow rock-specific tires didn’t accelerate as quickly as it would have with more aggressive tires. How good is this car? There is a waiting list of buyers ready the instant Flanders decides it is time to begin a new car starting with a Turbo model.

 

KOMBUSTION_5

 

Parts and Suppliers List

2014 RZR XP 4 1000 Titanium Matte Metallic: $21,500

Custom 4 seat wrap with the signature Kombustion gears faded into Digital Camo with reflective Kombustion decals: $1500

Reflex 8+ suspension kit: $2695

4+ Rhino axles: $800

SuperATV boxed A-arms: $649

35×10-17 CST Lobo RC tires: $992

STI HD4 17×7 wheel: $600

RSK custom cage with sunroof built into the roof with vinyl underlay: $2600

RSK non-rattle spare tire carrier: $389

RSK rear bumper: $359

RSK rock sliders: $285

Assault Industries front bumper: $249

Rogue Off-Road hood and grille: $450

Safeglo 6-foot RZR whips set of two: $250

30-inch LED light bar: $300

Two Heretic Studio 4-inch pods: $200

Two 4-inch LED pods as reverse lights: $100

Fully street-legal-ready: $250

Axia 17-inch rear-view mirror: $189

Signature Kombustion 7-speaker system: $2500

Kombustion UHMW full skid plate with A-arm/trailing-arm guards: $650

Assault Industries heavy-duty turret tie-rods: $230

Assault Industries heavy-duty high-clearance turret radius bomber rods: $650

Heretic steering wheel with quick release: $275

Pro Armor doors: $1099

Pro Armor harness: $460

Baja Designs RZR 1000 headlight kit: $585

Contact: (801)674-2451, www.kombustionmotorsports.com

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