HPI Savage 5T - Electronics








"the clearing" Colorado - 2008

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HPI Savage 5T - Electronics

(date: May 18, 2012)

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Over the past few months I have installed a few electronic components on the 5t Flux to help it running cooler.

  • Hitec HS-7950TH HV Servo
  • Castle Creations CC BEC 10A
  • Castle Creations CC CapPack
  • Motor cooling fan
  • Turnigy nano-tech 5000mah 3S 65~130C Lipo Pack

First off it took a lot of effort to get the Hitec HS-7950TH HV Servo for $20. Yes I know it is cheap to get a $150 servo for $20. So here is the story about getting this servo for so cheap. I saw an ad on rctech.com for a Hitec 7955TG servo for cheap, but someone else beat me too it. So the seller offered to sell me a 7950TH for $20. Here is what he wrote to me:

"Just sold it sorry I have 7950 Hitec servo still work good all it needs pin for the gear drive thats all it needs $20 for it"

Needless to say I took his offer and bought the servo. A few days later in the a servo in the mail and its a 7955TG servo and it works perfectly. It was kind of strange but I did not ask, but of course it was too good to be true and I get an email asking me to send the servo back to him because he sent me the wrong one. About 2 weeks later I finally get the 7950TH servo, and never at one point did he ever offered to pay for the return shipping. So the servo did have the missing pin as described but I was lucky enough to find a pin that fit perfectly from my old JR servo. Even with the pin replaced the servo was still asking a bit strange because it would work intermittently. Majority of the time the servo will work fine then all of the sudden it stops responding. To make a long story short Isent the servo back to Hitec 3 times for repair and finally after the third time they sent me a brand new servo.

  • First return: Broken Motor Ground
  • Second return: Damaged Motor
  • Third return: Damaged Motor and Amplifier

Here are some spec on the servo:

Motor Type: Coreless
Bearing Type: Dual Ball Bearing
Speed (6.0V/7.4V): 0.15 / 0.13
Torque oz./in. (6.0V/7.4V): 403 / 486
Torque kg./cm. (6.0V/7.4V): 29.0 / 35.0
Size in Inches: 1.57 x 0.79 x 1.50
Size in Millimeters: 39.88 x 20.07 x 38.10
Weight oz.: 2.40
Weight g.: 68.04

Savage 5T Flux-  Hitec HS-7950TH HV Servo



Since I now have a HV servo I wanted to run it at its full potential, so I installed a Castle Creation 10amp BEC. Plus this will lessen the strain on the built-in BEC on the speed controller.
Savage 5T Flux - Castle Creation BEC


Next I installed a Castle Creation Cap Pack, all this really is an set of capacitors in front of the battery leads. The “CapPack” is designed for use in high powered electric vehicles, where batteries may suffer from voltage drop under severe load this capacitor bank will give you that bit of extra go under acceleration
Savage 5T Flux - Castle Creation CapPak

Savage 5T Flux - Castle Creation CapPak



Too keep the motor running a bit cooler I installed a fan on top of the motor to keep a constant air movement around it. Savage 5T Flux - Motor Cooler Fan

And finally the Turnigy nano-tech 5000mah 3S 65 -130C Lipo Pack. These lipo battery are a lot better than the Turnigy (5000mAh 3S 40C) or Zippy (Flightmax 5000mAh 3S1P 40C). Don't get me wrong here the 40C lipos works great, but the 65C nano tech are even better. I do not have any equipment to test them but one quick way to tell you the difference is that with the Nano-Tech 65C I can pop a wheelie with the 5T Flux, when as the 40C could not and the 65C lipo runs cooler too. Savage 5T Flux -  Turnigy nano-tech 5000mah 3S 65~130C Lipo Pack

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