Designed, developed, and fully manufactured in-house at the XRAY factory in Slovakia, Europe, using the most high-tech German and Swiss machines and premium European materials, crafted with XRAY's trademark attention to detail by our production specialists. The X4 is truly a masterpiece.

All-new XLP Shocks are 9mm shorter and in total 10.4g lighter but contain the same oil volume as the ULP shocks for improved cornering speed, steering response, and stability.
The new shocks make the car easier to drive in all conditions and surfaces. The shocks are each 2.6g lighter, which helps to save 10.4g off the weight in front and behind the transmission.

The new shorter shocks lower the CG to further improve stability. With the shorter shocks, the X4’23 stays flatter, making it easier to drive in chicanes and making it more resistant to traction rolling, letting you carry more speed through high-traction sweepers. Steering response and cornering speed are significantly improved as well.

A new membrane shape and material improves maintenance. The membranes can be used for a very long time without any changes to the rebound setting.

In spite of the shorter overall length, the PSS inserts for the ULP shocks are compatible with the new X4’23 shocks, so existing PSS tuning options can be used.

All of the new XLP shock parts are specifically designed for the smallest possible size to reduce the weight and keep the lowest possible CG.

Shock bodies are CNC-machined from premium Swiss 7075 T6 aluminum and hardened to ensure the maximum lifespan. The aluminum upper and lower nuts have a lower-profile design, including sealing O-ring and upper composite ball joint. The shock shaft, shock adjustable nut, spring retainer and pivot balls are redesigned as well to achieve the lowest shock height possible.

The included shock pistons sets are new 4-hole pistons with 1.1 and 1.2mm diameter holes. The pistons are molded using a special process and composites to ensure extreme roundness while maintaining maximum stiffness and durability.

All-new XLP series of springs are 3mm shorter to match the new shock length and provide the correct rates and ride height. They are available in a full range of rate choices including 2 new alternatives of the progressive springs C2.4-2.7 and C2.6-2.9.

The X4’23 stock shock springs offer versatile out of box performance for many conditions. The most popular C2.5-2.8 in front and C2.6 in rear are included in the kit.

All XRAY springs are manually measured, selected, and matched into pairs to guarantee precisely equal length and damping characteristics.

Front shock towers are redesigned to work with the shorter XLP shocks. They are 8mm lower to improve the CG with only two optimized shock mounting positions, upper position for carpet and lower position for asphalt.

The top mounting position is the best choice for carpet, with the lower position best suited for asphalt. The split aluminum front shock towers are mounted directly to the chassis and have adjustable flex options by adding screws to secure the towers to the bulkheads for additional stiffness.

The new rear shock tower is also redesigned to match the shorter XLP shocks. The shock tower is 8mm lower to improve the CG with only two optimized shock mounting positions, upper position for carpet and lower position for asphalt.

The shock tower is reworked for improved durability in hard crashes, with 1mm of added material to the thinnest part of the tower for added strength.

Unlike the split front towers, the one-piece aluminum rear tower is mounted directly across the rear bulkheads as this configuration was found to provide better consistency and balance throughout testing, and maximize rear traction.

Heavy duty lower bulkheads provide improved durability while maintaining ultra-low weight. The bulkheads have added material in the most critical area for improved strength; even stronger than the optional HD bulkheads from the X4’22.

The bulkheads use centering pins for easier positioning on the chassis and for increased rigidity and consistency.

The bulkheads feature two solid axle/diff height positions that were developed for different surfaces. The lower position is mainly designed for carpet, and the upper position is more common on asphalt. The anti-roll bar mounting position keeps the wire bar placed under the drive shafts for a super low CG.

The bulkheads have milled grooves for the ball bearing hubs so the bulkheads can sit 1mm closer to the chassis center line from each side.

The bulkheads are connected by a graphite brace in front and shock tower in rear for added stiffness.

Made from premium Swiss 7075 T6 aluminum, black anodized.

Heavy duty upper clamps provide improved durability in hard crashes. The upper clamps have added material in the most critical area for improved strength; even stronger than the optional HD upper clamps from the X4’22.

The upper clamps use caster inserts for quick and easy set-up changes, and use centering pins for precise installation and improved reliability in a crash.
The screws installed from the bottom of the caster inserts capture the inserts in the upper clamps to prevent them from coming loose while servicing the car. The screws also serve as the upper arms pivot ball mounts, reducing the number of components in the assembly and reducing weight.

The upper clamps and caster inserts are made from premium Swiss 7075 T6 aluminum and black anodized.

The most frequently used 2 dots caster inserts are now included for the front, with the 3 dots inserts for the rear.

Aluminum inserts easily set the caster angle for quick and accurate tuning and in the rear suspension, the inserts can be reversed for even more adjustment possibilities.

Front and rear BB drive shafts improving cornering speed and rotation are now included in the kit and feature the all-new clip wheel hub retention system included for maximum comfort.

The X4 features 58mm ECS drive shafts in the front and 54mm CVD steel drive shafts in the rear. Both ECS and CVD drive shaft geometry places the drive axle pivot point in line with the rotation of the hubs for maximum efficiency and cornering speed.

The XRAY ECS drive shafts equalize the speed between the drive shaft and the wheel when cornering. With a unique 2-piece joint between the driveshaft and the wheel, an extreme turning angle is divided into two shallower angles in the ECS assembly to prevent bind while rotating. Regardless of cornering speed and wheel angle, the inner wheel will not bind or vibrate when using the ECS. Movement through the corner is more stable and precise. With the ECS drive shafts, wheel vibrations and noise are decreased to a minimum, steering is increased, and cornering speed & smoothness are noticeably improved.

ECS drive shafts are exclusively manufactured from special self-developed HUDY Spring Steel™. The drive shafts are strategically lightened to guarantee the lowest possible weight without compromising strength or durability.

The traditional 3.5mm driveshaft caps are replaced by the BB adapters that reduce friction during suspension travel and driveshaft movement, resulting in improved cornering speed and rotation. The BB driveshafts are now standard both in front and rear.

The gear differential includes steel diff outdrives for the BB drive shafts. The X4 gear diff produces the on-power steering that is needed on nearly all types of tracks, and is ideal for both carpet and asphalt tracks.

The gear diff includes a composite case and cover with the integrated pulley. The internal gears are precision molded from tough composite material and combined with aluminum drive shaft adapters to create a light and super-smooth differential.

Another key advantage of the gear diff is that it is virtually maintenance-free. When the diff is correctly built, there is no need for maintenance for a very long time… no need for frequent oil changes, and no leakage due to the superior sealing system.

The solid axle now features steel diff outdrives for BB drive shafts. Solid axle pulley position has the front belt alignment to match the center layshaft for improved consistency and forward traction.

New wheel hubs work with the new SCS - Spring Clip System for simplified installation. The wheel hubs are 0.5mm narrower than the original X4 hexes to reduce the car width and increase steering and traction.

Graphite composite hubs provide improved geometry for better steering and traction, fully adjustable axle height and improved driveshaft alignment.

Graphite composite front and rear hubs provide the proper suspension geometry for improved steering and traction. The hubs contain small size bearings and a drive axle that moves the driveshaft pivot point deep into the hub, in line with the hub’s rotational axis between the upper and lower arm.  This alignment improves driveline efficiency and handling. 
The ultra-narrow wheel hubs are lightened for reduced rotating mass.

The hubs allow full adjustability of the axle height to adapt the car to every condition.

The design of the hub is universal with the same part used at all four corners with corresponding extensions. The aluminum front steering plates and rear ARS plates are easily mounted depending on the hub’s location.

Heavy duty steering plates and ARS plates provide improved durability in hard crashes. The new 3D shape allows using a low downstop without touching the lower arm at full steering lock.

The new counter sunk screw mounted from the bottom allow easier bump steer / toe gain adjustment. Plus, when changing the bump steer shims the length of the ball ends does not have to be changed anymore.

The kit includes two different pivot ball lengths of 5.5mm and 6.5mm for different rear hub height adjustments. The new 6.5mm long pivot ball with 1mm extra thread length is suggested when using more than a 0.5mm hub height shim to improve the durability of the rear hub in serious crashes.

New heavy duty rear graphite post holder provides increased durability in hard crashes and more precise height adjustability with preset 6 steps of 1.2mm increments.

Rear body mount system connects directly to the chassis using vertical or horizontal body post positions for improved downforce and traction. 

The rear body mounting system is connected directly to the chassis and allows installation of the body posts in both the traditional vertical position and a horizontal position for a different feel on the track.

The carbon fiber brackets are machined from strong 3mm thick material and are connected to the chassis via sleek aluminum mounts.

Now 2pcs top deck are included in the kit to improve steering and traction in most conditions.  The graphite version for asphalt tracks includes the open top deck in the front, the aluminium versions for carpet tracks feature the top deck with special wave shape connection in front that reinforces the flex of the front suspension without a completely rigid connection which improves stability and consistency.

The 2pcs top decks are reinforced around the motor mount screws area and the groove in the front top deck is thinner to add more material for improved durability.

The Multi-Flex™ top deck has a narrow shape for easier installation, improved handling characteristics and features several different flex options out of the box using top deck screws.

The machined ultra-precise top deck screws ensure the top deck is mounted completely tweak-free to improve the flex characteristics.

Made from 2.0mm graphite material, the shape of the top deck has been specifically designed to achieve maximum traction and great steering characteristics at the same time. Optional 1.6 top decks are available for low to medium grip carpet conditions.

The top deck flex settings allow quick and easy adjustment of chassis stiffness in 3 different alternatives.

The graphite and aluminum versions of the X4’23 come with specifically chosen anti-roll bars for the best possible performance out of the box.

The wobble-free anti-roll bar system is mounted to the front & rear bulkheads via bearings for extra-smooth movement and quick & easy changes and adjustment. Each of the X4 versions comes with specifically chosen thickness of anti-roll bars for best possible performance out of the box.

X4’23 graphite edition features front 1.2mm and rear anti-roll bars.

X4’23 alu editions feature front 1.3mm and rear 1.2mm anti-roll bars.

The roll bar rotates in ball-bearings for maximum precision and free movement. Anti-roll bar height is adjustable via a screw.

The complete range of different anti-roll bar thicknesses is designed to work with the ball-bearing roll bar mounting system.

Anti-roll bars have laser-engraved stripes (corresponding to bar thickness) for easy identification.

The X4 platform was tested for improvements across all track conditions to provide race-ready performance out of the box. Even with this goal, there are still differences in track conditions that can require different components for the best results.

To allow the customer to choose their ideal starting point, there are three versions of the X4: the Graphite, Flex Aluminum and Solid Aluminum Edition, each tuned for different track conditions.

The Graphite edition is intended for asphalt tracks and low traction carpet tracks.

The Aluminum Flex edition is suitable for many carpet tracks and high traction asphalt tracks.

The Aluminum Solid edition is configured for high bite carpet tracks such as US black carpet style.

Some information shown below may include details from previous kits, and it may vary slightly from current kit specifications.

The X4 chassis is designed for the CFF™ suspension arms that are mounted via pivot balls directly to the chassis.

The X4 chassis works together with the motor mount and bulkheads using alignment holes for the centering pins on each of the mounted components. Thanks to the centering pins, the assembly of structural components is hassle free, and most importantly the parts resist movement in a crash to let you finish the race without losing pace.

Retained from our previous touring car platform, the mid motor chassis layout is designed around the centered drivetrain system.

The narrower design of the chassis together with the perfectly symmetrical shape provide optimal flex characteristics.

The bottom of the alu chassis is tapered to reduce contact between the chassis and the track to improve cornering speed.

There are three chassis alternatives to tune your X4 to any track conditions: 2.2mm graphite or 2.0mm aluminum flex chassis or 2.0mm aluminum solid chassis.

The symmetric X4 chassis creates equal side to side flex.

There are three chassis alternatives to choose from when configuring your X4:

The 2.2mm thick graphite chassis is CNC-machined from premium-grade material. This chassis is developed for all asphalt conditions. The narrow chassis is only 84mm wide with a variety of chassis flex adjustments that help to generate exceptional traction and give excellent steering characteristics.

The 2.0mm thick aluminum flex chassis is CNC-machined from premium Swiss 7075 T6 aluminum, then black coated and laser engraved. The narrow chassis is also 84mm wide and features special cut outs that provide the chassis flex characteristics suitable for a variety of the medium grip surfaces. The bottom edge of the chassis is tapered to reduce contact between the chassis and the ground during cornering to improve speed.

The 2.0mm solid aluminum chassis is available for high traction conditions like the black carpet tracks found in the USA. Made from the same 7075 T6 aluminum as the flex chassis, the solid aluminum plate lacks the flex cutouts to maintain the stiffness needed on high bite situations.

The X4 motor and layshaft mounts are integrated into a one-piece design that is placed on the absolute center line of the chassis. The motor mount has a pressed-in steel layshaft axle that is positioned in the middle of the chassis with the motor located to the rear of the layshaft. The motor mount is designed to maintain a super low CG but is still robust enough to resist bending in serious crashes. The more robust design also reinforces the center of the chassis and improves the stability of the X4.

The top of the motor mount features special milled holes to match the machined ultra-precise top deck screws made in-house. These purpose-made screws ensure the top deck is mounted completely tweak-free to improve the flex characteristics.

The motor mount features two integrated and adjustable belt tensioners to precisely set front and rear tension independently. The belt tensioners also serve as adjustable battery backstops.

The lower part of the motor mount features machined centering pins that are inserted in the chassis for easy assembly and to ensure it does not shift in a crash.

The X4 motor mount has two integrated and adjustable battery backstops to precisely set the battery offset from the center of the car. The battery backstop system is designed for use with the increasingly common shorty batteries as well as standard packs.

The battery backstops prevent the batteries from moving in a crash and interfering with the spur gear on the center layshaft.

For maximum drive train efficiency there are two ball-bearing equipped belt tensioners integrated in the motor mount’s battery backstop components. The two tensioners are individually adjustable to control the tension of the front and rear belts independently.

The motor mount is a vital part of the X4 Multi-Flex settings.

Smart design of the motor mount includes locations to install optional nickel coated brass weights specifically designed to fit around the driveline components and place the weight near the vehicle center.

Precision-molded spur gears are made from XRAY's exclusive composite material, ensuring true running, super-quiet operation, and robustness for handling powerful motors. A range of optional spur gears for fine tuning is available.

Universal reversible servo mount fits all standard servos without extra parts, with the choice of front or rear position to adjust the chassis flex and steering feel for different conditions.

The aluminum front chassis brace installs underneath the front solid axle and significantly improves the front chassis stiffness, making the X4 steering more responsive and generating more forward traction. 

The graphite brace reduces flex in the front of the car. The brace will increase initial steering response but will reduce grip from mid corner to exit. The brace is recommended for any conditions that benefit from aggressive initial response and is more precise to drive. The brace also increases stability on bumpy tracks

The composite front upper bumper brace prevents chassis damage in serious crashes. The brace was designed to distribute the forces from a big impact to reduce damage to the chassis plate. There are two different mounting positions depending whether the graphite brace is installed or not.

The X4 bulkheads have added centering pins for easier positioning on the chassis and for increased rigidity and consistency.

The new bulkheads offer an upper diff position that is higher than possible on previous models for improved handling in higher traction conditions resulting in better cornering speed and steering. The anti-roll bar mounting position keeps the wire bar placed under the drive shafts for a super low CG.

The bulkheads feature milled grooves for the ball bearing hubs so the bulkheads can sit 1mm closer to the chassis center line from each side.

The bulkheads are connected by a graphite brace in front and shock tower in rear for added stiffness.

Made from premium Swiss 7075 T6 aluminum, black anodized

The XRAY servo saver has become the industry-standard saver and remains unchanged and is included in each X4 kit.

Several linkage mounting positions are offered to make the steering linkage adjustment easier. The servo saver consists of 4 springs which makes the servo saver strong enough to provide the precise steering racers demand, while still being flexible enough to prevent servo damage in hard crashes. The servo saver has interchangeable bushings to fit most popular servos.

Both front and rear bulkheads feature additional integrated belt-tension adjustment through the use of adjustable bearing eccentric holders. These holders are also reversible to move the differential height from the lower or upper position that is now +1mm higher than the T4 platform.

The system controls the positioning of the pack in the chassis while at the same time reducing the battery pack’s impact on chassis flex, resulting in more consistent handling and stability.

Smart battery holders are specifically designed for LiPo batteries and are reinforced for harder impacts. The battery holders prevent the batteries from moving under racing conditions and crashes.

To ensure maximum performance, the X4's high-precision pivot balls are machined in-house and then black coated or nickel coated for a smooth and long lasting finish. To maintain proper balance through every run, the in-house machined top deck screws ensure tweak free handling from start to finish.

The 2-belt 4WD drivetrain concept provides maximum efficiency featuring 3mm narrow front and rear drive belts that have been specially ground for minimal thickness and maximum flexibility.

A full set of 25 high-speed, blue-sealed and steel ball-bearings are used throughout the drivetrain, steering and anti-roll bars to ensure maximum efficiency. All of the bearings are degreased and oiled with Aero Shell® Fluid 12 for maximum smoothness and long life. The bearings used in steering blocks and uprights have been specially selected to reduce unsprung weight and maximize drivetrain efficiency.

HUDY Exclusive Silicone Oils are manufactured in Europe and each batch is laboratory tested and calibrated to ensure the highest possible consistency and quality from batch to batch. Based on the industry-standard cSt rating, the new line of oils will be easy to identify, adjust, and feel.

When following any set-up sheets by XRAY or XRAY team drivers, you can be sure that the oils you will get for your car are exactly same as those used by the factory racing team, thus ensuring very exacting set-ups and handling.

HUDY Chem Series.

The chassis features pre-drilled holes for additional weights for optimum car balancing and centerline holes for easy balancing with the HUDY Chassis Balancing Tool #107880.

The extensive and impressive range of adjustment possibilities includes: ARS (Active Rear Suspension™), caster, camber, toe, anti-dive, anti-squat, ride height, downstops, track-width, lower roll center, upper roll center, roll center positions, steering roll center, wheelbase, Ackermann, steering lock, bumpsteer, belt-tension adjustment, adjustable shocks, adjustable in-line flex adjustment, adjustable front chassis flex, diff height and adjustable diff.

XRAY instruction manuals have become the industry standard, being simply the best manuals you will ever get with an RC model car. Whether you are a first-time builder or an experienced racer, all the instructions are straight-forward and easy to understand. The full-color Instruction Manual contains large 3D illustrations that show all assembly details in the clearest possible way.

To get the finest tips & tricks on how to build the X4 or to learn more about each of the set-up options, follow the series of XRAY X4 Tech Tip videos featuring Alexander Hagberg. The videos walk through each section of the building process with suggested assembly techniques, demonstrations, and detailed explanations of the various setup adjustments.

Not only will you own the most premium luxury model racing car in the world, but you will also become a member of the prestigious family of XRAY owners with direct support and service from the XRAY factory. XRAY brings you the most up-to-date RC Web site on the Internet, with daily racing news and latest product developments.

If you have any questions, problems or comments, you can ask the XRAY Support Team or any XRAY Factory Team Driver on the XRAY Tech Talk groups. You can even upload your own set-up sheets or download from the thousands of different set-up sheets available from all around the world at the exclusive XRAY Virtual Set-up Sheet Database, the world’s largest set-up sheet database. And that is only the start of the VIP treatment you get by joining Team XRAY.