Overview
The Spektrum Firma 100A Brushless Smart ESC / 6500Kv Sensorless Motor Combo is a purpose-built, high-performance electronic speed control and motor package specifically engineered for 1/10 scale drag racing and speed run vehicles powered by 2S LiPo batteries. Developed and designed by Spektrum engineers in partnership with the industry's leading ESC manufacturer, this combo delivers the advanced technology and reliability that competitive RC car UK enthusiasts demand. Whether you're setting up a Stock Class or Pro Class 2S drag car, this complete system provides a plug-and-play solution that eliminates the need to source compatible components separately, saving time and ensuring optimised performance from day one.
What sets the Firma 100A apart from standard brushless RC speed controllers is its Smart technology integration. This isn't just a basic ESC; it's an intelligent system that communicates with your Spektrum transmitter in real time, providing live telemetry data including RPM, temperature, battery voltage and capacity. This revolutionary one-wire telemetry system means you can monitor vital operating data during your run and make adjustments on the fly to boost performance when it matters most. For drag racers who live and breathe competition, this capability transforms the way you tune and optimise your vehicle setup.
The combo includes a high-RPM Firma 6500Kv brushless sensorless motor with a large 4-pole 8-magnet rotor design, CNC-machined aluminium housing and precision bearings for outstanding durability and smooth rotation. The system is waterproof and ready to perform in virtually any terrain under almost any conditions, making this an excellent choice for dedicated drag racers seeking a reliable, feature-rich brushless RC motor and ESC package ready to run straight out of the box.
Key Features
- Smart Technology Integration — The Firma 100A incorporates Smart connectivity that transmits valuable telemetry data directly to your compatible Spektrum transmitter in real time without requiring any extra accessories or additional wiring, allowing you to access RPM, voltage, temperature and more during operation.
- One-Wire Telemetry System — Rather than needing multiple wires, sensors, modules and links, the Firma ESC provides a single-wire telemetry solution that reports a wide range of data directly to your transmitter, simplifying installation and reducing weight and complexity compared to traditional telemetry setups.
- Real-Time Battery Data — When used with a Spektrum Smart LiPo battery, the system automatically provides live battery telemetry including cycle count, remaining capacity, individual cell voltage and more, helping you understand battery performance and maximise run time.
- Complete Motor and ESC Combo — This package includes both a matched 6500Kv brushless sensorless motor and the 100A Smart ESC, eliminating guesswork when selecting compatible components and ensuring the system is pre-optimised for 2S LiPo drag racing applications.
- High-Performance 6500Kv Motor — The included Firma brushless motor features a large 4-pole 8-magnet rotor design with CNC-machined aluminium housing, insulated high-purity copper windings and precision bearings for high RPM performance and exceptional durability through repeated drag racing cycles.
- Multiple Programming Options — You can programme the ESC using the Smart Firma ESC Programming Box, the SmartLink USB Updating and Programmer application, or directly from your Spektrum transmitter via Text Gen programming, providing flexibility to suit your preferred workflow.
- Waterproof Design — The all-weather waterproof construction allows the Firma system to perform reliably in dust, gravel, snow and water, meaning you can race in challenging conditions without worrying about water damage to your electronics.
- Pre-Tuned for Drag Racing — This combo is specifically sourced and pre-configured for Stock Class and Pro Class 2S drag cars, allowing you to drop it into compatible kits such as the Losi 22S No Prep Drag Car Roller and get racing immediately without extensive tuning.
- No Soldering Required — The system is ready to install straight from the box with high heat-resistant IC connectors (backwards compatible with EC connectors) and preinstalled 4mm gold-plated bullet connectors on the motor, eliminating soldering and saving setup time.
- Advanced 32-Bit ARM M4 Processor — The fast, powerful processor enables sophisticated control algorithms, smooth throttle response and complex telemetry processing that delivers consistent, predictable performance lap after lap.
- Multi-Point Protection Systems — The ESC includes over-current protection, automatic LiPo low-voltage cutoff, thermal protection and failsafe protection, working together to safeguard your motor, battery and ESC from damage during operation.
- Adjustable Timing Control — You can programme the motor timing via the ESC to optimise performance for your specific motor, vehicle setup and racing conditions, allowing fine-tuned performance adjustments without replacing components.
- Firmware Updates — The Smart ESC supports firmware updates through the Smart ESC Programming Box, ensuring you can access new features and performance improvements as Spektrum releases them for this brushless RC speed controller.
- 4mm Bullet Connectors with Gold Plating — The motor comes with preinstalled 4mm gold-plated bullet connectors that provide excellent electrical conductivity and secure connections for reliable power delivery without voltage drop.
Technical Performance
The Spektrum Firma 100A Brushless Smart ESC / 6500Kv Sensorless Motor Combo delivers impressive performance metrics designed specifically for competitive 1/10 scale drag racing with 2S LiPo battery systems. The 100A ESC supports a maximum continuous current rating of 100A with a peak burst current of 650A, providing the sustained power delivery needed for explosive acceleration off the line and consistent performance through multiple back-to-back drag runs. The sensorless 6500Kv motor is engineered for high-RPM performance, producing the top-end speed required in drag racing competition. The ESC features selectable 6V or 7.4V BEC output with 4A continuous current, sufficient for powering receiver circuits and other auxiliary electronics without requiring a separate battery eliminator circuit. The waterproof construction means the electronics can withstand the harsh environments typical of outdoor drag racing venues, whilst the aluminium heat sink with included optional cooling fan ensures thermal management during intensive racing sessions. The IC5 connector provides excellent conductivity and reliability, backwards compatible with EC5 connectors for flexibility in battery and charging options. The system accepts 2S-3S LiPo or 5-9 cell NiMH batteries, though the combo is specifically optimised for 2S LiPo racing applications. All components are compact and lightweight, with the 100A ESC measuring just 43mm in length, 39mm in width and 34mm in height, weighing only 136 grams, ensuring minimal added weight to your drag car chassis. The high-purity copper motor windings and precision bearings ensure smooth operation and exceptional efficiency, translating battery power directly into forward motion with minimal energy waste.
What's in the Box
- Spektrum Firma 100A Brushless Smart ESC
- Spektrum Firma 6500Kv Brushless Sensorless Motor
- Sticker Sheet and Mounting Tape
- Product Manual (Multilingual)
What You Need to Complete
- Spektrum Surface Receiver compatible with 2S LiPo power systems
- 2S LiPo Battery with IC5 or EC5 Connector (recommended for this system)
- Spektrum Transmitter with compatible receiver protocol
Frequently Asked Questions
- Is the Firma 100A Smart ESC suitable for beginners to drag racing? — Yes, the Firma 100A is an excellent choice for racers new to competitive drag racing because it's specifically designed and pre-tuned for 2S drag cars, eliminating complex compatibility decisions. The Smart telemetry system also helps beginners understand how their vehicle is performing by providing real-time feedback on RPM, temperature and battery status, making it easier to identify tuning improvements and learn what works best for their setup.
- What battery does this Spektrum brushless motor and ESC combo need? — The system is optimised for 2S LiPo batteries with IC5 or EC5 connectors, which are the standard power source for Stock Class and Pro Class 1/10 scale drag racing. The ESC also accepts 3S LiPo or 5-9 cell NiMH batteries, but the combo is specifically engineered and pre-tuned for 2S LiPo operation, so that's the recommended choice for best performance.
- Can I programme this ESC from my Spektrum transmitter? — Yes, one of the standout features of the Firma 100A is multiple programming options. With a Text Gen capable Spektrum transmitter, you can programme and adjust ESC settings directly from your transmitter using the Firma Prog text gen menu, with no programming box, USB cable or Bluetooth interface required. This allows on-the-fly adjustments right at the drag strip to suit changing conditions.
- Is this ESC waterproof? — Yes, the Firma 100A features an all-weather waterproof design that allows it to perform reliably in dust, gravel, snow and water. This makes it ideal for outdoor drag racing venues where weather conditions may be unpredictable.
- What makes the Smart telemetry system different from other RC speed controllers? — Unlike traditional ESCs that only record data for viewing after a run, the Firma Smart ESC transmits telemetry data in real time directly to your compatible Spektrum transmitter during operation. A single wire carries RPM, temperature, voltage, battery capacity and more to your radio display, allowing you to monitor performance and make adjustments on the fly without any extra sensors, modules or wiring harnesses.
- Does this combo include everything I need to go racing? — The combo includes the ESC and motor, which are the core drivetrain components. You'll also need a Spektrum Surface Receiver, a 2S LiPo battery with IC5 or EC5 connector and a Spektrum transmitter to complete your drag car setup. Many racers already own these components, but if you're building a new car from scratch, you'll need to acquire those items separately.
- What is the difference between this sensorless motor and a sensored motor? — The Firma 6500Kv motor in this combo is sensorless, meaning it determines rotor position through back EMF sensing rather than discrete position sensors. Sensorless motors are lighter, more compact and have fewer potential failure points. They perform excellently at the high RPM speeds required in drag racing, though they may not provide the same smooth low-speed crawling characteristics as sensored motors designed for crawling applications.
- Can I use this ESC in other types of RC vehicles besides drag cars? — Whilst the combo is specifically designed and pre-tuned for 2S drag racing, the ESC itself is a versatile 100A brushless speed controller that could theoretically be used in other 1/10 scale applications running 2S LiPo batteries. However, the 6500Kv motor is engineered for high-RPM performance and would be most suitable for high-speed applications. For best results and performance, use this system as designed in 2S drag racing vehicles.
- What protection systems does the Firma 100A ESC include? — The ESC features comprehensive multi-point protection including over-current protection to prevent damage from excessive current draw, automatic LiPo low-voltage cutoff to protect battery health and prevent over-discharge, thermal protection to prevent ESC damage from overheating, and failsafe protection to ensure safe behaviour if radio signal is lost during operation.
- Is firmware updating available for this ESC? — Yes, the Firma 100A supports firmware updates through the Smart ESC Programming Box, meaning you can access new features and performance improvements as Spektrum releases them, ensuring your ESC stays current with the latest technology and optimisations.
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 SPM Firma 100A Brushless Smart ESC / 6500Kv Sensorless Motor Combo 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.
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