This is to help those who are interested in purchasing a Savox servo. Please add any information you may think is helpful.
One of the most popular complaints with Savox servos is their tendency to draw too much current from the built in speed control's BEC. What this means in layman's talk is basically that the servo puts too much strain on the stock power supply. This thread will explain the symptoms of a Savox servo overdrawing current, why Savox servos do this, and the various solutions to this problem.
-WILL THIS BE A PROBLEM FOR ME? IS THIS WHAT'S WRONG WITH MY CAR? If you haven't bought the servo yet, consider how likely you are that this may be a problem. If the vehicle is relatively light weight (5 pounds or under) and not a rock crawler, most of the time this won't be an issue. In more particularly demanding scenarios, such as rock crawlers or 1/8 scale RCs, a fix to the issue may be in need. If you already own a Savox servo and your car/plane/boat has started acting a little funny, more than likely it's your new, orange Savox servo. Acting "funny" can mean anything from glitches during normal driving, shortened radio range (although do be sure to check your antennae in this case), and/or poor servo performance. Continue reading for the appropriate "fix."
-ARE THESE THINGS JUNK?! WHY DO THEY DO THIS? As someone who deals a lot with customers, it's understandable when a person who's just spent a good $50-70 on a pretty little servo can get angry when the Savox servo only seems to cause more problems, often glitching to the point of being undriveable, especially in heavier vehicles. The simple answer is no, Savox servos are not junk. Everyone has their own opinion, but they are one of the more well-known and well-thought-of brands out there, generally speaking. So why do they do this then? Well, the best answer I've found is not that they're inefficient, but the way in which they draw current. Unlike some of the other brands like Hitec, Savox servos tend to draw current from the BEC in a more jumpy, irratic fashion, for whatever reason. However, please understand that there is nothing "wrong" with the servo. It simply functions a little differently.
-TELL ME HOW TO FIX IT!!!! The most important thing here is getting the issue fixed, or preparing for it to ensure everything runs smoothly. In RCs less than 5 pounds and excluding rock crawlers, most of the time a simple gltich buster will do the job. Glitch busters are manufactured by Savox, Novak, Castle, and Venom and generally range between $5-25.These pieces of equipment are simply capacitors prewired to plug right into any extra slot of your vehicle's receiver. The glitch buster counteracts the Savox's tendency to draw large amounts of current at once by providing "help" to the built in BEC. The advantage to using a glitch buster is that it's a breeze to install (literally plug it in and you're done). The only downfall is that since the glitch buster is simply a capacitor, it can only hold and charge and then release it when the servo needs it most, it cannot actually put extra electrical current into the circuit, which brings us to our other option. The second option is an external BEC. A couple major manufacturers of external BEC are HobbyKing and Castle, usually ranging between $5-30. An external BEC simply adds extra juice to the system to help power the hungry little servo. The advantage of this over a glitch buster is that this can actually substantially increase the servo's performance because it is adding extra power to the system. Most external BECs are also tunable (the user can change the voltage at which they operate which can increase a servo's reaction speed and torque). The downfall of choosing a BEC is that they are more work to install and are bulkier. Generally on rock crawlers and any RC weighing over 5 pounds, a BEC is the way to go with a Savox servo. Depending on the specific model, check to make sure you wire it properly, and note that soldering is generally required to be installed.
A few links to the products mentioned above.