The GTX8 is XRAY’s 1/8 nitro GT based on the European Championship-winning XB8 off-road platform. Utilizing proven, high-performance components from the first generation kit, the new GTX8 incorporates many new features and refinements to push its performance to the next level.
The GTX8 is typically XRAY– premium, professional, high competition R/C car for the most demanding racers, developed with attention to the smallest details and backed by premium service & support…a luxury masterpiece.
“I designed and hand-made my first off-road cars back in 1986, and they were dominating the races thanks to unbeatable reliability and best performance. Years later in 2004 we have started our first mass production XRAY XB8 platform based on our long-term experiences, knowledge, and R&D expertise gained over decades, taking over the heritage I brought with me.
Using the XB8 platform we have worked with the XRAY R&D team to create the finest and highest performing GT nitro car and I am happy that we continue to carry the legacy of my first off-road cars into this new platform in order to take you to the Winners Circle.”
Dipl. Eng. Juraj Hudy
XRAY Chief Designer
With XRAY's uncompromising design philosophy bringing everything together to make the best GT nitro car, the GTX8 has the unique XRAY character, born of precision craftsmanship, highest attention to detail, and using only the finest quality materials.
Designed, developed, and fully manufactured in-house at the XRAY factory in Slovakia, Europe, using the most high-tech German & Swiss machines and premium European materials, crafted with XRAY's legendary attention to detail by our artistic production specialists. The GTX8 is truly a masterpiece.
Before I started racing off-road cars, I was actively professionally racing 1/5 scale on-road cars and I won 2x a European Championship. In my position as R&D Designer at XRAY, I was very happy to be involved again with an on-road project where I could bring my prior experience to the table.
I have thoroughly enjoyed my involvement in this new GT project, and I strongly believe this class will rapidly gain popularity due to its simplicity, easy handling, and great fun. I will continue to support the ongoing development of this new platform, and will be available to support all XRAY customers.
XRAY GTX8 Designer
The new XB8 chassis was redesigned to fit both Soft and Hard composite radio boxes without modification. The included Soft radio box allows more chassis flex and is suggested for most standard track conditions. The optional Hard radio box increases vehicle stability and is suggested for very high temperature and high traction conditions.
The chassis is CNC-machined from 3mm high-quality Swiss 7075 T6 aluminum, strategically machined in low-stress areas, and then anodized to make it as light as possible without affecting strength or rigidity.
The all-new high-volume differentials were developed to improve vehicle control and consistency over long runs and enhance reliability. The differentials feature larger capacity cases, and larger internal gears with more teeth for improved differential moment. The larger oil volume and the shape of the gear teeth reduce overheating. The diff pins have a new, stronger design to improve reliability.
All-new front lower and upper arms are moulded using a harder material to improve response and to maintain bind-free suspension movement in dusty or hot conditions.
The longer rear arms help create more forward traction and allow quicker acceleration out of the corners. The rear arms are also moulded from an extra hard material for consistent and responsive performance.
The updated front upper arm geometry allows for less caster to improve the steering characteristics, increase the overall steering and help reduce tire wear.
All-new front upper arms with less caster improve the steering characteristics, increase the overall steering and reduce the tire wear.
The rear uprights feature new larger outer 8x16x5mm ball-bearings for increased reliability and life-span. To expand the set-up alternatives, an additional lower roll-center adjustment position was added.
The smart design allows the same upright to be used on both left & right sides. The wheelbase position is adjustable using 2 shims along the lower suspension pin.
The rear uprights feature integrated geometry adjustments including: camber, upper and lower roll center and wheelbase.
The longer camber link accommodates the revised roll center positions on the new uprights.
The narrow rear suspension holders work together with the new longer rear arms to improve overall grip, forward traction and allow earlier acceleration at corner exit.
Clutch performance is critical to engine operation, fuel mileage, throttle control and traction. The all-new adjustable, 4 shoe clutch improves clutch bell engagement for better engine response and improves throttle feel.
The clutch design features 4-shoes machined from a graphite material. The clutch setting can be tuned with the adjustment nut to control the engagement point as desired.
The GT shocks were redesigned with new shock caps and cell shock membranes. The all-new shock caps feature 4 bleeding holes for more equal oil bleeding and a more precise shock rebound setting.
The cell shock membranes have less air gap that helps to generate more grip. The redesigned shape of the composite bushings result in free operation even in dusty conditions.
Oversized big-bore shocks featuring 16.2mm I.D. shock bodies are externally threaded with an adjustable collar for quick & easy spring preload adjustment. The shock bodies are hardcoated in a titanium color and feature a 1-piece alu shock cap.
The larger front and rear anti-roll bars help control chassis roll, increase corner speed and improve the stability of the car.
The front & rear roll bars are easily mounted to the bulkheads and can be adjusted using the connected linkages.
Manufactured from spring steel material, anti-roll bars of different thickness are optionally available for fine-tuning.
Front and rear chassis braces have significant influence on chassis stiffness and flex, and as such have a great impact on handling under different grip conditions.
The longer rear brace is moulded from a medium-stiff composite mixture for proper flex & rigidity, and allows the mounting of optional graphite inserts to reinforce the brace to make it even stiffer (suitable for high-traction conditions).
Weight balance on the GTX8 is easy to adjust for different track conditions. Weight can be moved to the front, middle, or rear by moving the suspension arms as required to get the best handling.
Diff bulkheads are an important chassis component, housing both the front and rear differentials and providing mounting points for the suspension mounts and shock towers.
The diff bulkheads have been designed for extreme durability, while providing easy access for tuning and maintenance.
XRAY Pivot Ball Suspension XPBS™ is a uniquely innovative concept, and smart R&D design. The ultra-robust pivot ball suspension has integrated suspension geometry adjustment, with different kingpin plates being optionally available.
The complete integrated suspension geometry adjustment includes:
• Track Width
• Bump Steer
• Upper Roll Center
• Lower Roll Center
• Kingpin angle
Correct suspension geometry is one of the most important features of any RC model car, while at the same time being one of the most difficult & challenging features to design properly.
Suspension is always a mixture of:
• Design & shape of individual suspension parts
• Flex & hardness
• Mounting system
• Geometry & position of mounting points of connecting parts
From the suspension arms, through the suspension blocks, to the robust steering blocks, every suspension part has been carefully designed for the 1/8 racing platform to provide responsive racing characteristics in all conditions.
XPBS™ steering blocks are unique, innovative, smart... an authentic XRAY innovation.
The steering blocks feature the following integrated geometry adjustments:
• bump steer
• kingpin angle
The steering block consists of a super-lightweight composite steering block and stiff Swiss 7075 T6 kingpin plate. The steering block is mounted via massive pivot balls into the upper & lower arms.
The upper pivot ball is mounted into an adjustable upper ball joint and via roll center shims to the kingpin plate; this assembly allows camber and upper roll center adjustment. Using shims of various thicknesses, the upper roll center can be adjusted quickly & easily.
The lower pivot ball is mounted into the steering block via an adjustable alu nut and composite bushing. By adjusting the pivot ball, both track-width and camber can be adjusted.
• A higher roll center (more shims) is recommended for grippy, high-traction tracks as well as for bumpy tracks.
• A lower roll center (fewer shims) is recommended for slippery and smooth tracks.
The included kingpin plate has two different mounting possibilities to choose either 0° or 7°.
The front upper suspension is part of the innovative, unique XPBS™ suspension concept. Extra-strong and robust front upper arms are mounted to the front bulkhead assembly into the front shock tower and adjustable suspension holder. Using eccentric bushings, front inner upper roll center can be easily adjusted.
Caster is easily adjusted using caster clips which are inserted either in front or behind the front upper arms.
The ball link is inserted into the upper arm and the integrated adjustable turnbuckle can be accessed from outside for quick & easy camber link adjustment.
To guarantee maximum reliability, all turnbuckles are manufactured from a special blend of HUDY Spring Steel™ which is specifically formulated for turnbuckles. The turnbuckles have a tougher core and are well suited for steering system and rear upright linkages.
The dual-arm steering system is simple yet effective, and features an integrated, easily adjustable servo saver and Swiss 7075 T6 aluminum steering plate.
Ackermann is easily adjusted by quickly & easily changing steering link mounting positions on the steering plate.
Bump steer is easily adjusted by shims between the steering plate and steering linkages.
The GTX8 has a conventional shaft-drive 4WD drivetrain featuring:
• Front & rear gear differentials with adjustable oil viscosity,
46T crown gears, and 14T pinion gears
• Central 2-speed gearbox. (1st) 49T/16T, (2nd) 46T/19T
• Front, rear, and central CVD drive shafts
Super-lightweight diff outdrives are machined from HUDY Spring Steel™ with unnecessary material removed from the outer part of the outdrives to reduce rotating weight without affecting durability. The inner portions of the outdrives are additionally hand-ground for maximum precision and fitment into the diff case.
The outdrives are hardened using HUDY’s own special hardening process to provide extended lifespan and reliability.
GTX8 constant velocity drives (CVDs) are manufactured from world-renowned HUDY Spring Steel™. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in off-road RC cars.
The larger & stronger central outdrives feature protective rubber boots, thick 3mm pins, and protective locking rings.
All drive shafts and outdrives are hardened with a proprietary hardening process to provide unbeatable lifespan and reliability.
Ultra-lightweight 17mm wheel hex drive hubs are CNC-machined from Swiss 7075 T6 black-coated aluminum.
The alu hex hubs are specially machined to reduce rotating weight while guaranteeing wobble-free wheel mounting.
GTX8 springs have been specifically designed to complement the big-bore shocks.
XRAY shock springs are manually measured, selected, and matched into pairs to guarantee precisely equal length and damping characteristics.
Ultra-precise shock pistons feature 6-, 8- and 10-hole options. The big-bore pistons are molded from tough, well-proven Delrin® material to provide smooth action and durability. The precision molding production process ensures perfect piston roundness after production, so that the pistons move super-smoothly inside the shock bodies for identical perfect action in all four shocks.
The 2-speed transmission is mounted on a precision-manufactured, super-smooth layshaft made from tough HUDY shaft steel for 2-speed, which is additionally heat treated for extra strength and long life.
The 2-speed gear adapter is CNC-machined from Swiss 7075 T6 for precision fitment of the 1-way bearing, allowing super-precise and wobble-free installation of spur gears.
The high-quality 1-way bearing is hand-ground before installation for maximum running precision and strength. The 2-speed adapter is manufactured from hardened steel.
High-grade, CNC-machined aluminum engine mounts are made of lightweight alloy, and they help to dissipate engine heat. The engine mounts are easily adjustable from the bottom of the chassis to obtain proper gear mesh.
The 1-piece electronics assembly is very compact and can be quickly & easily removed for servicing and cleaning. You need only to remove a few screws from the bottom of the chassis to remove the entire electronics assembly from the car.
The large molded radio box features a very clean design and layout that places the weight in key areas for proper balance. The batteries are placed along the centerline of the chassis in the front, and the lightweight receiver is placed on its side at the rear. The easy-to-access radio box is mounted on the side of the car and is secured by the fewest possible screws.
For racers not using a radio switch, a handy molded cover is included to help guarantee a leak-free radio box. The tight antenna tube holder ensures that the antenna tube stays attached even if the car flips over.
The GTX8 features a well-proven, high-performance braking system that is strong, precise, and dependable to make slowing and stopping consistent and reliable. Coupled with the car’s balanced load distribution, the extraordinary control imparted by the braking system gives you complete confidence as you pitch the car into corners.
XRAY focused on the smallest details when designing the brake system. The laser-cut, precision flat-ground steel brake disk allows for fade-free braking in conjunction with the special high-grip brake pads installed on laser-cut steel backing plates.
The brake disk is small, slim, and very lightweight. The precision hand-grinding allows true, wobble-free rotation. Brake inputs are transferred precisely to the brakes thanks to the rigid, high-precision machined brake cams. Brake disk and brake pad backing plates are specially heat-treated for maximum lifespan.
The 150cc extra-large capacity fuel tank is super-strong and features an integrated floating stone filter to ensure that the fuel pickup will always be in the correct orientation, even if your car isn’t. This fuel pickup system will allow fuel to continue to flow to your engine, even while waiting for a marshal to right your inverted car.
Internal baffles ensure that fuel will always be in the area around the fuel line inlet.
The fuel tank cap features a very strong spring which ensures the cap will always close after refueling, and the specially-designed rubber seal perfectly seals the fuel tank to ensure that no fuel leakage will occur.
The fuel tank is molded from a special composite mixture that ensures very high reliability and rigidity. The molded-in splashguard protects the brakes from fuel spillage. The tank is mounted with rubber grommets to absorb vibration, and small composite holders secure thick 5.5mm silicone fuel tubing. Gluing of the tank pieces is performed by a special self-developed robotic system that ensures maximum accuracy and precision in pre-heating and gluing.
In order to comply with differing race regulations, the design of the car allows the installation of either the included 150cc fuel tank or optional 125cc fuel tank.
A new connecting link was introduced between the throttle servo and the radio box to compensate for the softer, more flexible radio box as well as to eliminate throttle servo vibrations to the chassis. This will help to ensure more precise throttle and brake control.
The compact front foam bumper is made from high-resilience foam. The front upper bumper holder and lower composite bumper are molded from rigid composite to withstand hard crashes.
XRAY’s self-designed GTX8 body – made from high-quality Lexan™ material – features high-downforce areas: front windscreen for proper airflow, and side downforce areas for higher stability. The high-performance, low-profile aerodynamic body was designed by XRAY to perfectly fit the GTX8. The rear part of the body includes 3 wing struts for added durability; a high-strength wing is included.
The GTX8 body is available as an option only.
The GTX8 features fully-adjustable front & rear suspension geometry. For quick & easy adjustment, we recommend using set-up tools and accessories from HUDY, the world leader of RC tools.
The extensive and impressive range of adjustment possibilities includes:
• Ride height
• Lower roll center
• Upper roll center
• Roll center positions
• Bump steer
• Adjustable shocks
• Adjustable front and rear diffs
• Adjustable XRAY Multi-Flex™
XRAY Instruction Manuals have become the industry standard; they are 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 instructions are straight-forward and easy to understand. The full-color Instruction Manual contains large 3D illustrations that show all assembly details in the easiest and most comprehensive manner.
The chassis design focuses on balanced weight distribution and weight transfer. Centerline holes are pre-drilled in the chassis plate for easy balancing with the HUDY Chassis Balancing Tool #107880.
The drivetrain ball-bearings now include grease instead of light oil to maximize the lifespan of the ball-bearings, especially in dusty conditions. A full set of 27 high-speed, blue-sealed ball-bearings are used throughout the drivetrain to ensure maximum 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.
The GTX8 includes premium HUDY Graphite Grease - a high-performance, advanced-technology semi-fluid lubricant which incorporates both extreme pressure additives and finely-dispersed graphite for superior load carrying.
HUDY Graphite Grease is intended primarily for the lubrication of rotating parts and loaded gears. In addition to providing outstanding load carrying, it is formulated to have excellent adhesion and resistance from "flinging off" under extreme conditions. HUDY Graphite Grease reduces wear and increases parts life.
Owning an XRAY model racing car is an experience unto itself. 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 website on the Internet, with daily racing news, and the 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 Support Forum. You can even upload your own set-up sheets or download from the thousands of different set-up sheets available from around the world at the exclusive XRAY Virtual Set-up Sheet Database. And that is only the start of the VIP treatment you get by joining Team XRAY.