The 2015 Polaris RZR XP 1000 EPS FOX Edition lasted for only one model year, but it remains one of the most interesting naturally aspirated RZRs Polaris produced during the first-generation XP 1000 era.
Polaris took the 110-horsepower RZR XP 1000 and equipped it with large FOX PODIUM internal-bypass shocks, revised dual-rate springs, front and rear anti-sway bars, a color digital display and six-point harnesses. The result was a substantially more controlled RZR without the added weight, heat and complexity of a turbocharger.
After approximately 18 months of testing our FOX Edition in the dunes, desert, rocks and snow, we came away convinced that it was far more than a graphics package. Its suspension transformed the character of the XP 1000 and provided a strong foundation for a versatile long-term project.
What Made the FOX Edition Different?
The centerpiece of the 2015 FOX Edition was its suspension. Polaris replaced the Walker Evans Racing shocks used on the regular XP 1000 with 2.5-inch FOX PODIUM internal-bypass shocks in front and massive 3.0-inch internal-bypass shocks at the rear.
The internal-bypass design used multiple damping zones to provide a relatively compliant ride over smaller impacts while progressively increasing resistance as the shocks moved deeper into their travel. Separate rebound zones helped control chassis movement as the suspension extended.
Polaris paired the shocks with revised dual-rate coil springs designed to reduce spring noise and improve control across a wider range of terrain. The lighter initial spring rate helped absorb smaller impacts, while the main spring supported the vehicle through harder hits and when carrying additional weight.
Front and Rear Anti-Sway Bars
The FOX Edition was also the first RZR XP 1000 equipped with a factory front anti-sway bar. Polaris combined it with a revised rear bar that was approximately 25 percent softer than the standard XP 1000 rear bar.
This combination made a noticeable difference in fast corners. The front bar reduced body roll, sharpened steering response and made the RZR feel more predictable through high-speed sweepers and under hard braking. The softer rear bar helped preserve some rear suspension independence instead of making the chassis feel excessively rigid.
For rock crawling, the anti-sway bars could be disconnected to increase articulation. For dunes and faster desert riding, reconnecting them restored flatter cornering and more precise steering.
Polaris Interactive Digital Display
The FOX Edition also included the Polaris Interactive Digital Display, an advanced feature for a 2015 sport UTV. The full-color display provided vehicle information, GPS mapping and Bluetooth connectivity. Although later versions of Polaris RIDE COMMAND became considerably more sophisticated, this early system helped establish the direction Polaris would follow with connected in-vehicle displays.
Our First Ride in Glamis
Our time with the FOX Edition began at the 2015 UTV Industry Ride in Glamis. Large dunes are an unforgiving suspension test because steep transitions and abrupt compression faces can quickly expose inadequate damping or spring control.
Earlier RZR models had a tendency to move through their front suspension travel too quickly and reach the bump stops on hard dune transitions. The FOX Edition was different. Its internal-bypass shocks delivered noticeably more bottoming resistance and better chassis control than the standard XP 1000.
At the time, it was the most aggressive and capable factory suspension package we had tested on a production UTV. Read our original RZR XP 1000 FOX Edition dune review for more detail from that first Glamis test.
Why the Naturally Aspirated Engine Still Worked
The FOX Edition arrived just before turbocharged sport UTVs began dominating the performance market. Its naturally aspirated 999cc parallel-twin produced a claimed 110 horsepower, considerably less than the turbocharged machines that followed.
Horsepower, however, was only part of the equation. The naturally aspirated XP 1000 was lighter, mechanically simpler and delivered immediate throttle response. That made it easy to control in technical rock sections and predictable when balancing the vehicle through dune transitions.
It also produced less heat and placed fewer demands on the cooling system than the early turbocharged RZRs. For riders who valued responsive power and versatility more than maximum straight-line acceleration, the FOX Edition remained an appealing package.
Building Our FOX Edition
The stock FOX suspension was excellent, but we eventually sent the shocks to FOX for a DSC adjuster and dual-rate spring upgrade. The DSC system added separate high- and low-speed compression adjustment, giving us more control over ride comfort, body movement and bottoming resistance.
This was the biggest performance improvement we made to the RZR. The suspension became plusher over smaller trail irregularities while retaining even more control during hard landings and deep compression events.
Additional chassis and protection upgrades included Holz Racing Products heavy-duty A-arms with upgraded ball joints and Factory UTV UHMW skid plates. These changes were particularly valuable because we regularly used the FOX Edition on the Rubicon Trail and other rock-crawling routes.
The thin factory plastic skid plates provided limited protection against sharp rocks. The UHMW replacements offered much more complete coverage and slid across obstacles instead of hanging up as easily. For an XP 1000 that spends significant time in rocks, underbody protection should be one of the first upgrades.
Cage, Doors and Occupant Protection
SDR Motorsports built a short cage, Hi-Bred doors and front bumper for the project. The cage lowered the visual profile of the RZR while the doors and bumper added protection without turning it into an excessively heavy build. ProLine Wraps completed the exterior with continuation graphics that matched the factory FOX Edition design.
We also replaced the stock seats and six-point H-style restraints with PRP suspension seats and race-style four-point harnesses. Better occupant containment reduces the amount of energy a driver uses to brace against the vehicle, making it easier to remain focused during long sections of rough terrain.
Drivetrain and Reliability Upgrades
SuperATV Rhino axles and an upgraded steering box added strength for rock crawling. An S&B particle separator reduced the amount of dust reaching the engine air filter, while an EPI clutch kit helped maintain belt performance during demanding climbs in the rocks and dunes.
The clutch calibration was especially useful when changing between heavy rock-crawling tires, paddle tires and the Camoplast track system. Each setup placed different loads on the continuously variable transmission.
Other additions included an Assault Industries fire-extinguisher mount, radius rods and side mirrors, KC HiLiTES FLEX lighting, illuminated whips, a Rugged Radios intercom and a Got Sand? custom shifter.
Even with those upgrades, we tried to keep the FOX Edition lighter and simpler than many of our other RZR builds. Adding accessories is easy, but excessive weight can gradually erase the responsiveness and suspension performance that made the original vehicle so enjoyable.
For a closer look at the complete project, see our 2015 RZR XP 1000 FOX Edition buildup.
Testing Across Multiple Types of Terrain
We used the FOX Edition in a much broader range of conditions than a typical short-term vehicle review. It traveled through the Rubicon Trail, Moab, Johnson Valley, Glamis, Sand Mountain and Camp RZR. We also fitted it with a Camoplast T4S track system for snow testing near Lake Tahoe.
The common thread across all that terrain was chassis control. The FOX internal-bypass shocks helped the RZR remain composed at desert speeds, while its naturally aspirated power delivery and compact two-seat chassis worked well in technical rocks.
With the sway bars disconnected, the suspension could articulate through uneven rock sections. With them connected, the vehicle felt substantially flatter and more predictable in dunes and fast corners.
Rubicon Trail
The Rubicon placed more emphasis on ground clearance, underbody protection, steering strength and low-speed control than outright suspension speed. The FOX Edition worked well in this environment, particularly after adding the Holz A-arms, upgraded ball joints and UHMW skid protection.
Moab, Utah
Moab gave us the opportunity to test the RZR on steep sandstone climbs and descents, including Hell’s Gate and High Dive. The XP 1000’s predictable naturally aspirated throttle response was a major advantage when precise power delivery mattered more than maximum horsepower.
Prairie City and Johnson Valley
Glamis and Sand Mountain
Dunes were where the FOX Edition’s suspension advantage was most obvious. Its increased bottoming resistance, large rear shock bodies and front anti-sway bar gave it much better control through transitions than the standard XP 1000. GMZ Sand Stripper XL tires provided the flotation and traction needed to make effective use of the engine’s 110 horsepower.
More Moab Rock Crawling
Snow Tracks
We also installed a Camoplast T4S track system and tested the FOX Edition in the snow near Lake Tahoe. The tracks dramatically increased flotation and traction, although they reduced speed, increased steering effort and placed much greater loads on the drivetrain.
The 110-horsepower XP 1000 had enough power to turn the system and climb surprisingly steep snow-covered hills. Read our complete Polaris RZR XP 1000 track-system review.
Long-Term Verdict
The 2015 RZR XP 1000 FOX Edition proved that suspension development could make a larger difference to real-world performance than simply adding horsepower. It delivered better bottoming resistance, flatter cornering and more predictable chassis behavior while preserving the responsive character of the naturally aspirated XP 1000.
Its limited one-year production run also gave it an important place in RZR history. Much of the FOX Edition’s suspension strategy carried forward into the original RZR XP Turbo, making the 2015 model a preview of the next stage in Polaris sport-UTV development.
The later turbocharged RZRs were unquestionably faster, but the FOX Edition remained lighter, simpler and exceptionally versatile. It could run hard through the dunes, cover rough desert terrain, crawl technical trails and even operate on snow tracks without feeling fundamentally out of place.
For riders shopping the used market, condition and maintenance history now matter more than the original special-edition equipment. The FOX internal-bypass shocks should be inspected for leakage and serviced if their history is unknown. Buyers should also check suspension joints, wheel bearings, steering components, CV boots, skid plates and the condition of the drive clutch and belt.
A clean, properly maintained FOX Edition remains one of the more desirable early RZR XP 1000 variants. Our long-term test showed why: Polaris started with a responsive naturally aspirated platform and gave it the suspension it deserved.
Continue exploring: Visit our history of the Polaris RZR or browse the latest Polaris UTV news, reviews and model guides.
