Overview
The ARRMA 1/10 OUTCAST 4S 4X4 BLX Stunt MT (with Centre Diff) Gunmetal is the next evolution in fast 4S stunt trucks, delivering a perfectly balanced combination of speed, agility, and durability that appeals to enthusiasts seeking a ready-to-run RC car UK. This brushless RC monster truck represents the affordable middle ground between nimble 3S BLX vehicles and more powerful 6S BLX machines, making it an exceptional choice for anyone ready to experience amped-up blasting and stunting across all terrains. Whether you're a seasoned basher or new to the world of brushless RC, this fully assembled RTR (ready-to-run) model comes straight from the box with everything you need except a LiPo battery and charger.
Built on ARRMA's legendary tough platform, the OUTCAST 4S has been completely re-imagined for 2023 with updates that drivers have been asking for. The standout feature is the all-new oil-filled centre differential, which provides incredible traction and handling across any surface condition, from tarmac to dirt. Combined with the updated 4S-capable Spektrum brushless power system, strengthened chassis with centre diff module and hingepin bracing, and comprehensive dirt protection, this stunt truck is ready for the most intense all-road action. The short 313mm wheelbase allows for easy flips and nimble maneuvering through obstacles, whilst the wide 450mm front and rear track provides aggressive bashing stability.
ARRMA has become one of the most recognised names in RC bashing, and this updated OUTCAST 4S BLX RTR exemplifies why. Every component has been carefully selected and tested to deliver next-level handling, performance, and speed. The gunmetal colour scheme gives this model a distinctive, modern appearance that stands out on any terrain. If you're looking for a high-performance, durable ready-to-run brushless RC truck that won't compromise on quality or features, the OUTCAST 4S 4X4 BLX Stunt MT represents outstanding value and capability.
Key Features
- Oil-Filled Centre Differential — The standout feature of this 2023 update is the aluminium-cased centre differential with specially formulated oil, providing ultimate grip and traction across any surface. This technology allows the truck to maintain consistent handling whether you're blasting across loose dirt or smooth concrete, significantly improving cornering speed and overall control compared to vehicles without a centre diff.
- Updated Spektrum 4S Brushless Power System — The OUTCAST 4S features a Spektrum FIRMA 3668 2400Kv brushless motor with beautifully etched aluminium can and 4-pole construction for smooth, consistent power delivery. The integrated heatsink and cooling fan keep motor temperatures down during extreme running, extending component lifespan and maintaining peak performance throughout extended bash sessions.
- Spektrum FIRMA 120A V2 Smart ESC — This waterproof and dustproof electronic speed controller is rated for 120A continuous discharge and features full 4S LiPo compatibility (also compatible with 2S and 3S). The improved punch and driving feel provide superior throttle response, whilst Spektrum SMART Technology and IC5 connectors (EC5 compatible) ensure reliable power delivery and user-programmable performance tuning for punch, brake, BEC, reverse speed, and motor timing settings.
- Metal-Geared Spektrum S662 Digital Servo — Upgraded with higher torque output of 17kg/236oz-in and rapid 0.15 second speed at 7.4V operation, this servo features an alloy case centre and steel gears for improved heat dissipation and durability. The enhanced steering response sharpens the truck's maneuvering capabilities at high speeds, ensuring sharp, accurate turns even during aggressive driving.
- Reinforced Chassis with Centre Diff Module — The tough composite chassis has been revised to accept the centre differential module with added hingepin bracing and dirt drain system. This engineering ensures that the centre diff remains protected whilst allowing dirt and debris to drain away, combining protection with practical serviceability.
- Comprehensive Dirt Protection — Wishbone dirt guards protect the rear driveshafts from dirt and debris, whilst deep side guards provide additional defence against impact and contamination. These components are keyed directly to the chassis for maximum strength, ensuring your investment withstands the harshest off-road conditions.
- Easy-Access Modular Design — Grommeted windows allow easy access to motor screws, and the bigger power module accommodates the centre differential whilst remaining simple to remove for tuning and maintenance. This design philosophy means you can perform routine maintenance and adjustments without complete disassembly.
- Sealed Centre Differential Design — Steel input gears and main diff gears with silicone sealing keep dirt and debris away from the differential's internal mechanisms, ensuring long-term reliability and consistent performance even in filthy conditions.
- EXB All-Metal Gear Differentials — Front and rear differentials feature proven steel main and input gears for maximum durability and power handling, ensuring consistent torque distribution and reliability during intense bashing sessions.
- Short Wheelbase for Stunting — At just 313mm between the front and rear wheels, the compact wheelbase allows the OUTCAST 4S to flip with ease, making tricks and stunts effortless. This agility also improves maneuverability through tight obstacles and around complex terrain.
- Front and Rear Skid Plates — Protective skid plates guard the chassis where it matters most, absorbing impacts and preventing damage to critical components during aggressive driving and crashes.
- Long Oil-Filled Shocks — Aluminium shock bodies with long travel provide plush, responsive suspension action across varied terrain. The silicone O-rings ensure supreme sealing, preventing oil leakage and maintaining consistent damping characteristics throughout the life of the vehicle.
- Extreme Bash CVD Driveshafts — Front and rear driveshafts feature impact-absorbing composite construction with steel CV couplings, delivering unstoppable power transfer whilst protecting internal drivetrain components from shock loads.
- 17mm Aluminium Wheel Hexes — CNC machined and anodised, these wheel hexes provide increased durability and contribute to the ARRMA's distinctive, quality appearance.
- Anodised Aluminium Centre Support Brace — Features integrated rubber dampers for shock absorption, providing maximum durability and chassis rigidity during extreme driving.
- Steel Driveshaft Couplings — Strong, hard-wearing constant velocity driveshaft joints ensure reliable, efficient power delivery without flex or failure even under extreme torque.
- Integrated Wheelie Bar — With rubber tyres, this allows effortless stunt action and tricks, enabling you to perform impressive wheelies and other stunts with confidence.
- Tough Composite Wing and Mount — The body features a replaceable double-headed steel skids for protection, along with a rear wing that combines style with aerodynamic function and protective benefits.
- dBoots BACK-FLIP LP Vented Tyres — Made from high-quality rubber with aggressive tread pattern, these vented tyres find solid grip on a wide range of surfaces, from loose dirt to smooth concrete. The low-profile design contributes to the truck's aggressive stance and improves handling characteristics.
- Integrated Servo Saver — Now fitted with 25T spline, the integrated servo saver protects your steering servo from sudden impact loads whilst maintaining responsive steering control.
- Double Wishbone Suspension — Front and rear suspension arms provide stable, responsive handling with excellent bump compliance and recovery for smooth riding across rough terrain.
- Spektrum SLT3 2.4GHz 3-Channel Transmitter — This radio features fast response SLT protocol, foam wheel for comfortable grip, improved trigger feel and force, and a 2-way thumb switch for the 3rd channel. Includes 50% and 75% throttle mode options for beginners, making this ready-to-run RC truck accessible to newer drivers.
- Spektrum SR315 Dual Protocol Receiver — Compatible with both SLT and DSMR 2.4GHz protocol transmitters, this receiver offers fast response rate and outstanding range. Zero tool binding and protocol switching mean simple operation, whilst SMART telemetry compatibility in DMSR mode connects to the Spektrum dashboard app for performance monitoring.
- Waterproof and Dustproof Electronics — All critical electronics including the ESC and servo are sealed against water and dust ingress, allowing confident driving in wet and muddy conditions whilst maintaining long-term reliability.
- Multi-Terrain Versatility — Whether you're bashing on tarmac, concrete, dirt, grass, or mixed terrain, the OUTCAST 4S is engineered for all-road performance with suspension and drivetrain tuning that adapts to any surface.
Technical Performance
The ARRMA OUTCAST 4S 4X4 BLX delivers exceptional performance through a carefully engineered combination of components. At its heart is the Spektrum FIRMA 3668 2400Kv brushless motor, rated for 4S LiPo operation with a powerful 4-pole construction that produces smooth, consistent power delivery across the entire RPM range. This motor connects to a Spektrum FIRMA 120A V2 Smart ESC featuring full waterproof and dustproof design, capable of handling 120A continuous discharge with integrated protection systems including thermal overload monitoring and low voltage cutoff. The ESC is fully programmable, allowing users to adjust punch, brake sensitivity, BEC output, reverse speed, and motor timing to suit personal driving preferences and track conditions.
The electrical architecture uses IC5 connectors (EC5 compatible) throughout for reliable power transfer, with quality 12awg wiring ensuring minimal voltage drop and maximum efficiency. The system supports full 4S LiPo battery operation along with 2S and 3S LiPo compatibility, providing flexibility in battery selection. The included Spektrum S662 digital servo delivers 17kg of torque at 7.4V operation with remarkable 0.15 second response time, sufficient for rapid steering inputs at high speeds. All electronics integrate Spektrum SMART Technology for telemetry monitoring and system compatibility.
The drivetrain features a sophisticated three-differential system with steel main and input gears throughout. The front and rear differentials operate at 2.85:1 internal ratio, whilst the new centre differential runs at 500,000cSt oil viscosity providing infinite-slip characteristics for optimal traction. The final drive ratio of 12.48:1 combined with the 57-tooth spur and 13-tooth pinion creates a balance between acceleration and top speed suitable for 4S bashing. The EXB CVD front and rear driveshafts utilise composite slider construction with steel couplings, capable of absorbing and transferring extreme torque loads without failure.
Suspension geometry employs double wishbone arms front and rear with oil-filled aluminium shock bodies. Front shocks run 550cSt silicone oil with 1.16 N/mm spring rate, whilst rear shocks use matching 550cSt oil with slightly softer 1 N/mm spring rate. This setup provides compliant ride quality over rough terrain whilst maintaining chassis stability during aggressive maneuvers. The suspension geometry incorporates high shock towers allowing extended travel, with adjustable ride height allowing fine-tuning for different terrain types and driving styles.
The chassis is moulded composite construction weighing 4.17kg without battery, measuring 515mm in length with a compact 313mm wheelbase and 450mm front and rear width. Ground clearance stands at 63mm, sufficient for most terrain obstacles. The body is injection-moulded and factory-finished in distinctive gunmetal colour, featuring a wheelie bar and protective bumpers. Wheels are black multi-spoke design with 17mm CNC machined anodised aluminium hexes, rolling on dBoots BACK-FLIP LP vented multi-terrain tyres measuring 155mm diameter with medium-stiffness inserts. All bearings throughout the chassis incorporate rubber shielding for contamination protection.
What's in the Box
- 1x ARRMA OUTCAST 4S 4X4 BLX Stunt Truck RTR — Fully assembled and finished
- 1x Spektrum FIRMA 120A V2 Smart Waterproof ESC
- 1x Spektrum FIRMA 3668 2400Kv Brushless Motor
- 1x Spektrum S662 Metal-Geared Waterproof Digital Servo
- 1x Spektrum SLT3 2.4GHz 3-Channel Transmitter
- 1x Spektrum SR315 3-Channel Dual Protocol Receiver
- 4x AA Alkaline Batteries (for transmitter)
- 1x IC5 Loop connector (for use with single 3S or 4S battery pack)
- 1x Multi Tool and Hex Wrenches (2.0, 2.5mm)
- 1x Instruction Manual
What You Need to Complete
- 1x LiPo Battery — Choose either 2x2S, 1x3S, or 1x4S Hardcase LiPo battery. Recommended minimum specification: 5000mAh, 35C continuous discharge rate. Maximum dimensions: 165 x 51 x 48mm
- 1x Compatible LiPo Charger — Essential for safely charging your battery
- 1x LiPo Safe Charging Bag — Important safety equipment for charging and storage
Frequently Asked Questions
- Is the ARRMA OUTCAST 4S BLX Stunt Truck suitable for beginners? — Absolutely. This ready-to-run model arrives fully assembled and includes everything needed except a battery and charger. The included Spektrum SLT3 transmitter features 50% and 75% throttle modes specifically for beginners, allowing new drivers to start with reduced power and build confidence before accessing full performance. The robust construction and durable components mean the truck can withstand the learning curve of occasional crashes and impacts.
- What battery does the ARRMA OUTCAST 4S need? — This model accepts three battery configurations: 2x2S, 1x3S, or 1x4S Hardcase LiPo batteries. The recommended minimum specification is 5000mAh capacity with 35C continuous discharge rating. Maximum battery dimensions are 165 x 51 x 48mm. For beginners, a single 3S battery provides excellent performance and value, whilst 4S batteries deliver maximum power and speed for experienced drivers.
- What makes this 4S model different from the previous generation OUTCAST? — The 2023 V2 update introduces a revolutionary oil-filled centre differential for ultimate traction, an updated and more powerful Spektrum brushless system with improved punch, enhanced dirt protection with taller side guards and wishbone dirt guards, and a reinforced chassis specifically engineered to accommodate the centre differential module. The servo has been upgraded to the higher-torque S662 with faster response time, and the ESC benefits from the latest FIRMA 120A V2 Smart technology.
- Is this truck waterproof? — The ESC and servo are both waterproof and dustproof, meaning you can drive through water and mud without fear of electronics failure. However, the motor is not waterproof, so whilst splashing through puddles and mud is fine, complete submersion should be avoided. Always refer to the instruction manuals for specific waterproof standards and limitations.
- What surfaces can this truck drive on? — The OUTCAST 4S is engineered for all-road use and performs excellently on tarmac, concrete, loose dirt, grass, sand, and mixed terrain. The suspension geometry, tyre design, and centre differential make it equally at home on smooth surfaces and rough off-road terrain.
- How fast is the OUTCAST 4S? — With the 2400Kv motor and 4S LiPo battery, this truck delivers impressive speed suitable for basher use. The exact top speed depends on battery type, gearing adjustments, and driving surface, but the 4S power system ensures this is among the fastest vehicles in ARRMA's mainstream lineup.
- Can I adjust the performance? — Yes. The Spektrum FIRMA 120A V2 Smart ESC is fully programmable, allowing adjustment of punch (throttle response), brake strength, BEC voltage, reverse speed, and motor timing. Additionally, gearing can be changed by swapping pinion or spur gears, and suspension can be tuned by adjusting shock oil viscosity, spring rates, and ride height.
- What is the advantage of the centre differential? — The oil-filled centre differential provides superior traction and handling across all surface types. It allows front and rear axles to rotate at different speeds during cornering, preventing understeer and delivering more predictable, controllable handling. This technology is commonly found on high-end RC vehicles and significantly improves overall performance.
- How durable is this truck for bashing? — ARRMA has built a reputation for extreme durability, and the OUTCAST 4S exemplifies this philosophy. The composite chassis, steel drivetrain components, aluminium shocks, skid plates, and comprehensive dirt guards all contribute to exceptional durability. The design incorporates hingepin bracing and sealed differentials to withstand repeated impacts and harsh conditions.
- What is included with the transmitter? — The Spektrum SLT3 is a fully featured 3-channel 2.4GHz transmitter with foam grip wheel, improved trigger feel, and 2-way thumb switch for the auxiliary channel. It includes a 50% throttle mode for beginners and 75% throttle mode as an intermediate setting before full power. Four AA alkaline batteries are included for initial operation.
- Can I upgrade or modify this truck? — The OUTCAST 4S features ARRMA's easy-access modular design, making maintenance and upgrades straightforward. Motor access is simple through grommeted windows, and the power module can be removed easily. Many aftermarket hop-up parts are available to enhance performance, durability, or customise the appearance.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ARRMA 1/10 OUTCAST 4S 4X4 BLX Stunt MT (with Centre Diff) Gunmetal C-ARA4410V2T3 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
