Xray have introduced their entry to the 1/10th 2wd Short Course category with the release of the SCX. Based on the company’s XT2 truck platform, the backbone of the car is the CNC-machined 2.5mm Swiss 7075 T6 aluminium chassis. Super lightweight, its retains the necessary strength and rigidity for the longer wheelbase SCX and is black coated at Xray’s own in-house fully robotic coating line. As is necessary in the SC class the front and rear bumper assemblies protects the truck from impacts with other vehicles during the close quarters racing common in Short Course events, while the side bumper braces provide support to the body in case of an impact and help protect the chassis. A tweak-free fully adjustable battery holder as well as simple battery installation through the smart quick-release system, the car utilises a LCG transmission that uses a super-narrow, ultra-low CG gear box with quick & easy diff access with the narrow design of the LCG gear box, reducing weight and moving all parts closer to the chassis centre line
CNC-machined from high-quality 2.5mm Swiss 7075 T6 aluminium, the lightweight chassis retains the necessary strength and rigidity for the longer wheelbase SCX and is black coated at XRAY’s own in-house fully robotic coating line. After extensive testing of different chassis designs, the final concept was selected for its flex characteristics and layout to produce the best balance of traction and stability. The chassis features bent sides for improved stiffness, and increased traction with maximum stability for the truck.
Side guards integrate with the chassis and incorporate the adjustable battery holder system.
Side Guard Braces
Graphite side guard braces make the front of the car more stable and more predictable. The multiple mounting positions create three possible flex settings.
The SCX rear bumper assembly protects the truck from impacts with other vehicles during the close quarters racing common in Short Course events, and also contributes to the scale appearance that makes the class popular.
Just like the rear assembly, the front bumper and body mount provide protection in the case of a serious crash while maintaining the scale appearance.
Side Bumper Braces
The side bumper braces provide support to the body in case of an impact and protect the chassis. Velcro™ tape can be applied to the braces and the body to provide some additional security when mounting the body.
The tweak-free fully adjustable battery holder is integrated into the side guards allowing quick and easy battery position adjustments, as well as simple battery installation through the smart quick-release system. The battery pack can be moved front/rear to adjust the balance of the car. When the rear motor brace is removed, the battery pack can be moved completely rearward to maximise the rear weight bias and generate extra traction for the rear suspension. The height of the battery backstop is also adjustable for different battery dimensions. The battery holders are mounted to the chassis through one connecting screw on each side brace to eliminate any negative effects on chassis flex.
The LCG transmission uses a super-narrow, ultra-low CG gear box with quick & easy diff access. The narrow design of the LCG gear box reduces weight and moves all parts closer to the chassis centre line. The included gear box layout moves the weight of the motor forward to place more weight over the front axle for improved steering and corner speed on high grip surfaces.
Diff Height Adjustment
The LCG gear box also features a differential height adjustment. There are 6 height adjustment positions available using the included eccentric bushings. The ideal position will vary depending on the track conditions, ride height and the size of the tires used.
Easy Diff Access
The SCX gear box features easy access to the differential for quick setup changes or maintenance. All parts fit together perfectly, and the super-easy access to the rear differential will be appreciated by every racer. The durable gear box houses the differential and transmission components and serves as the mounting point for the rear roll centre holder, motor plate, and rear shock tower.
Motor Mount Brace
The motor mount brace ensures optimum flex via a pivot ball mount that allows some side flex for increased traction. The design of the SCX layout also allows removal of the motor mount brace to increase flex and to move the battery pack further to the rear for more weight over the rear axles to improve rear traction.
The LCG differential has greater internal oil volume to increase consistency of the diff action, yet at the same time it is narrow to fit into the LCG gear box and to move the rotating weight closer to the centreline. The super-smooth gear diff includes a composite case and cover with internal satellite gears that are precision-moulded from special XRAY-developed graphite composite material, ensuring a long lifespan and super-smooth, efficient operation.
Power from the motor is transferred to the drivetrain via an externally adjustable slipper clutch for quick & easy tuning. The 3-pad slipper clutch ensures super-smooth clutch operation and efficient and consistent braking. It is extremely easy to make ultra-fine adjustments to the clutch externally. The slipper clutch pads are made from ultra-efficient SLS material with very high slip efficiency, allowing for very precise slip adjustment. The lightweight slipper plates are machined from premium Swiss 7075 T6 and additionally hardened before a final black surface treatment. The plates have a machined relief which decreases the friction surface to assist with clutch slip adjustment. With this plate design, pressure is focused on the circumference of the clutch pads for increased efficiency.
The super lightweight motor mount is machined from Swiss 7075 T6 aluminium and is designed to fit the LCG gear box design and spur gear protector. The moulded composite gear protector prevents contact between the spur gear and the body. Moulded from strong, lightweight material, the cover helps to protect the body shell and spur gear.
The dual-arm steering system is simple and effective. The steering system is fully bearing-equipped with 8 high-speed ball-bearings for very precise steering. The Ackermann is easily adjusted by changing the steering link mounting positions on the steering plate. Bump steer is can be adjusted for more aggression by inserting a shim between the steering block and steering linkage. Ackermann is also tuneable by inserting a shim on the steering plate or by changing various graphite extension plates on the steering blocks.
Roll Centre Holder
Both front & rear suspensions feature adjustable suspension holders with multiple roll centre positions. The roll centre holder is designed to fit the LCG gear box and serves as the rear anti-roll bar mount. An optional rear aluminium roll centre holder features roll centre positions in between the stock positions for additional tuning choices.
SCX constant velocity drives are manufactured from world-renowned Hudy Spring Steel. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.
The rear uprights feature aluminium roll centre mounts with adjustable roll centre positions The upper roll centre is adjusted at the camber link via shims (up/down & in/out), while the lower roll centre is adjustable via eccentric inserts for 9 different positions (up/down & in/out). The multi-function uprights have the upper roll center position in the middle of the axis of the driveshaft joint to help generate more traction and increase stability. There are three different uprights available: hard (included), graphite (optional), and aluminium (optional), each suitable for different track conditions.
Front and rear shock towers are moulded from strong composite materials and include multiple upper shock positions.
The aluminium suspension holders feature the Integrated Suspension Settings (I.S.S.™) which allows for quick & easy suspension geometry set-up. Using eccentric bushings that are inserted into the Swiss 7075 T6 aluminium suspension blocks, as well as additional shims and turnbuckles, the SCX suspension geometry is completely adjustable.
The suspension arms are the result of long-term testing of different designs and layouts. Length, thickness, flexibility, geometry, and materials used… these are all part of the concepts and details that are thoroughly reviewed to create optimum suspension arms. The suspension arm itself is rigid enough to provide a responsive feel, yet soft enough for durability. The exclusive composite mixtures used for suspension arms are a perfect balance between reliability and performance. There are three different suspension arms available: medium (included), hard (optional), and graphite (optional), each suitable for certain track conditions.
The SCX comes equipped with offset hexes to perfectly match the width of the car. Ultra-lightweight 12mm wheel hex-drive hubs are CNC-machined from Swiss 7075 T6 black-coated aluminium. These ultra-true hex hubs have a clamping design to ensure ultra-solid mounting of the wheel’s hub. To adjust track-width, optional offset wheel hex-drive hubs are available.
The tiny yet tough steering blocks are comprised of composite steering blocks and graphite Ackermann extensions for variable Ackermann positions. The blocks are moulded from a special composite mixture for maximum strength. There are three different steering blocks available for various track conditions: medium (included), hard (optional) and graphite (optional.)
The caster blocks are very lightweight, yet their construction makes them very stiff & rigid. Caster can be adjusted with values 0°, 2.5°, or 5° using included caster bushings. There are two different caster blocks available: medium (included) and hard (option), each suitable for different track conditions.
The front lower chassis brace is another component of the Multi-Flex system that influences flex and handling. There are two different chassis braces available – medium (optional) and hard (included), each suitable for particular track conditions. The brace is mounted directly to the chassis to hold the entire front assembly and front suspension, including the front protection bumper. An optional medium-hardness composite moulded brace is suitable for low- and medium-traction tracks. The included brace is moulded from hard-hardness composite and is suitable for high- and very-high-traction tracks.
Front Lower Arm Mount
The lower composite arm mount is an important part of the chassis where the lower arms mount, and the block has an integrated 26° kick-up angle. Optional aluminium and brass arm mounts are available to alter kickup geometry and for additional weight balance adjustment.
As a part of the Multi-Flex system, the front upper deck is used to adjust chassis flex. There are two different upper decks available – medium (optional) and hard (included), each suitable for particular track conditions. An optional medium-hardness composite upper deck is great for low-and medium-traction conditions. The included brace is moulded from hard-hardness composite and is suitable for high-traction and very-high traction conditions.