Viper R/C VST5.5-XL Sensored Brushless 550 Motor (5.5T)

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This is the Viper R/C "VST-XL" 5.5 Turn, 3,700kV Sensored 550 Brushless Motor. From onroad, to offroad, to the rocks, no matter where you drive, Viper R/C has a motor for your application. Ready to run, is not always good enough. You want your car ready to race, with the power, control and reliability to win. Quality craftsmanship, superior materials and a commitment to rigorous testing are at the heart of Viper R/C Solutionsí product philosophy, so your VST motor not only gets you running, but keeps delivering the power you need to get the most out of your RC car in even the most demanding conditions.

Viper R/C Solutionsí VST series sensored brushless motors offer smooth and efficient performance, durability, versatility and quality. The VST series motors features high precision ball bearings for superior performance, longer life and a re-buildable design. Plus, optional tuning rotors (not included) offer a wide range of tuning options, allowing you to get the most out of your motor. A precision machined 6061 T6 billet aluminum ribbed can is designed to provide the best protection and cooling, while the ultra low resistance, high current soldering tab system provides trouble free connections and easy wiring.

Engineered, built and tested to meet the needs of even the most demanding 1/10 scale RC car applications, Viperís VST series brushless motors provide the smoothest power band and reliable performance for your 1/10 scale RC car.


  • High grade copper solder tabs
  • Lightweight design
  • High grade components throughout!
  • Ribbed Can adds valuable cooling surface area
  • Sealed Can adds longevity and durability
  • Molded timing cap protects sensor board and lightens motor
  • Fully adjustable timing
  • ROAR legal
  • Laser engraved, no stickers
  • 180 day warranty
kV: 3,700        
Case Length:
2.87 in. (72.80mm)
Case Diameter:
1.42 in. (36.00mm)
Shaft Length:
3.5 in. (89mm)
Shaft Extension:
0.58 in. (14.8mm)
9.45oz (268g)

This product was added to our catalog on June 28, 2011.

Verified Owner
Wednesday, Apr 3 2013 (about 2 years ago)
Viper R/C VST5.5-XL Sensored Brushless 550 Motor (5.5T)
I bought this motor and it burned up within 5 minutes in a Slash 4x4. I'm running vipers vtx8 esc (which I like) and was geared high on 3S but it was set up the same as my thunder power Z3R 550 that I have ran for a while and my stock vxl motor and esc handled it for months. There are no published limits of the motor that I have found as far as voltage or gearing. I was told by viper that it is for 2S and 13t pinion and it is not covered under warranty. That is a boring set up IMO. It would have been $80 to replace it. Now I'm stuck with out an extra motor and out $109 that should have gone towards a tekin or castle system. Maybe it's ok for racing on 2S but not a good choice for trying to go fast. Unless you plan on only running 2S and gearing it like stock set up, you should look at a different motor. For me, just a basher that likes to go fast, it was not a good choice. Even if I raced, knowing that 2S and very conservative gearing put it at it's limit, I would opt for another motor with higher durability for reliability sake. I wish there was more information on it's capabilities. I don't mean to degrade viper as a company because I do like the vtx8 and progauge is awesome. Their customer service is top notch. They answer the phone without going through a million options, answer questions, they looked at my motor in a very timely fashion. Only thing is, I wish they would have replaced my motor for me after telling me what I can run it on. I understand why they didn't (it was destroyed), but even though I probably wouldn't use it much, I like having spare parts and thus not have thrown over $100 down the drain if it was replaced. I gave this a bad rating due to the lack of information in the first place and it's low capabilities in comparison to other motors in the same $100+ range that do list more information. Hope this helps.
christopher keiser
Tuesday, Sep 3 2013 (about 2 years ago)
Viper R/C VST5.5-XL Sensored Brushless 550 Motor (5.5T)
I have a 4.5 t 550 xl and was not impressed. it thermaled in the first race and has never been rite. I was using 50c 6500 mill 2 cell. and geared 40 spur 13 pinion. it is a 110$ paper weight.
Ryan Kelly
Monday, Sep 2 2013 (about 2 years ago)
Viper R/C VST5.5-XL Sensored Brushless 550 Motor (5.5T)
You are right, Viper does STRESS 2S lipos. They will list a kv limit if 3S compatible, I've seen many people have issues w/ Viper over this, & they are strict. I've had some stress w/ them myself over the Copperhead. They gave me a break on a ESC & I got this motor. I must say this motor Ballsy w/ good run times even if you are throttle heavy you will be impressed. Well built, but most of all has a great power range, plenty of torque with a top end that will get you on the podium

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