Spektrum RC Firma 85 Amp Sensorless Brushless Smart ESC & Motor Combo (4000Kv)

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Spektrum RC Firma 85 Amp Sensorless Brushless Smart ESC & Motor Combo (4000Kv)
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Price: $104.99

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This Spektrum RC Firma 85A Smart ESC & Motor Combo for surface vehicles is waterproof and delivers power and intelligence all-in-one. Without additional sensors or modules, they feed battery and ESC telemetry data straight to your radio in real time, all over one connection. Now includes a compatible 4000Kv Firma Brushless Sensorless motor when you purchase this combo.

  • Smart all-in-one telemetry
  • Fast, powerful 32-bit ARM M4 processor
  • Waterproof
  • Multiple options for easy programming:
  • Button programming
  • Smart ESC Programming Box
  • SmartLink USB Updating and Programmer application
  • Multi-point protection:
  • Over-current protection
  • Automatic LiPo low-voltage cutoff
  • Thermal protection
  • Failsafe protection
  • Developed and designed by Spektrum™ engineers, in partnership with the industry's leading ESC manufacturer
  • Compact for easy installation in most applications
  • Ready to install — no soldering required
  • Rugged plastic case with mounting tabs
  • Aluminum heat sink for high efficiency
  • Cooling fan
  • Adjustable high-power BEC
  • Firmware updatable through the Smart ESC Programming Box
  • High heat-resistant IC™ connectors, backwards compatible with EC™ connectors
  • Limited 1-year warranty
Time Delay Brake: Yes
BEC Voltage: 6V (4A)
Forward: Yes
Weight: 80g (2.8 oz)
Continuous Maximum Current: 85A (760A Max Burst)
Output Connector Types: 4.0mm Female Bullet with 12AWG, 150mm wire
Reverse: Yes
Input Connector Types: IC3 with 12AWG, 160mm wire
Width: 1.4 (37mm)
Height: 1.5in (38mm)
Brake: Yes
Input Voltage: 7.4 - 14.8V
Length: 2.2in (57mm)
Width:1 .4 (37mm)
Height: 1.5in (38mm)
Weight :80g (2.8 oz)
BEC Voltage: 6V (4A)
Motor Specifications:
Application: 1/10 scale 4WD, 2WD, and on-road models running on 2S LiPo power
Bushing Or Bearing: Bearing
Connector Type: 4mm Bullet
Efficiency: 81%
Input Voltage: 6-8.4V
Maximum Continuous Current: 40A
Motor Design: Inrunner
Motor Size: 3652
Motor Type: Brushless - Sensorless
Number of Poles: 4
Product Weight: 7.4oz (210g)
RPM/Volt (Kv): 4000Kv
Shaft Diameter: 0.125" (3 mm)
Wire Gauge: 12 AWG

  • (1) Spektrum™ Firma™ Smart ESC
  • (1) Spektrum Smart sticker sheet
  • (1) Product Manual

This product was added to our catalog on January 28, 2021

James Aschenbrenner
Verified Owner
Monday, Mar 7 2022 (about a year ago)
Spektrum RC Firma 85 Amp Sensorless Brushless Smart ESC & Motor Combo (4000Kv)
The spektrum firma 85 amp 4000kv brushless sensorless is beyond bad @$$ and powerfully fast...i first had it in a 1/12th scale Wltoys124019 and with 2s and larger rear tires even there was absolutely no cogging at startup and in fact it wheelied off the line and when I put the 3s in it was doing backflips off the line when I'd punch the throttle so I then installed it into a 1/10th scale 2 speed crawler from gmade.net GS02F BUFFALO kit and the low speed is very controlled and the hi input really spins the wheels when needed... The versatility of this esc and motor combo is phenomenal from my experiences with it so I'm very ecstatic because this is my 1st spektrum buy and now going to be the only product I purchase... I just started RC Cars as a hobby 3 months ago and never looking back... I bought cheap escs and got tired of them blowing right away so I spent the little extra and I see why paying the little extra in one purchase is worth it... If there is anything else www.amainhobbies.com would like reviewed I would be more than delighted to give my input about products...
Jorge Abraham
Verified Owner
Saturday, Feb 18 2023 (10 months ago)
Spektrum RC Firma 85 Amp Sensorless Brushless Smart ESC & Motor Combo (4000Kv)
Product lasted less than 10 runs using a 2s lipo, shaft in motor completely severed. Do not recommend.
Chris Smith
Verified Owner
Friday, May 27 2022 (about a year ago)
Spektrum RC Firma 85 Amp Sensorless Brushless Smart ESC & Motor Combo (4000Kv)
Super easy to install. Instructions clear. Fit and finish v. Good. Minor issue in that the double tap for reverse znd single pull for forward feature is reversed. Throttle is not reversed. Will consult internet snd local Gurus in Bermuda to fox. Infraction runs faster than stock now.
Next upgrade will be steering servo.
will Mendez
Verified Owner
Wednesday, Apr 27 2022 (about a year ago)
Spektrum RC Firma 85 Amp Sensorless Brushless Smart ESC & Motor Combo (4000Kv)
Love the combo got me just what I wanted.. not giving it 5 stars because I had to switch 2 wires because reverse and forward was backwards..