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  1. #1
    RC Competitor
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    Adding external capacitors to esc

    I want to add some external caps to my mamba monster. What I want to know is what caps should I buy? I know I can buy castle cc packs or similar but I want to make my own. I like the feeling of the DIY things.
    Like what uf does it need to be and volts. I mainly run 4s and 6s very little.

  2. #2
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    Oh one more thing. How many?

  3. #3
    RC Turnbuckle Jr.
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    I have the castle cap on my merv..easier to buy there's but you could copy it and buy the same amount and size
    While do you think you need one?

  4. #4
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    What is the principle behind external capacitors?
    Make it idiot-proof and along comes a better idiot

  5. #5
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    A capacitor is kinda like a battery. It stores energy and helps keep a steady voltage.

  6. #6
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    I wonder if they would help with cogging...even on 4S, I still get moderate cogging (although I've also heard that cogging is more a function of sensorless ESCs than anything).
    Make it idiot-proof and along comes a better idiot

  7. #7
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    @50 I get a lot of cogging at take off. And I'm bored. Lol I use to install radio systems in cars and the capacitors really helped out with lights dimming every time the bass hit hard. But even if I didn't have the cogging I would like to still do it to have my rc's running at there best. We race every weekend and my friends pockets are deeper than mines. Lol.

  8. #8
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    @zippo the way it works is. When you hit the throttle it takes time for the volts to travel from the battery to the esc to the motor. It also depends on how long your wires are. The capacitors store the volts so that when you need it its there and won't have to wait for it to travel thru all the wires.

  9. #9
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    Thanks...I learn a little more each day here.
    Make it idiot-proof and along comes a better idiot

  10. #10
    RC Turnbuckle Jr. 87 GN's Avatar
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    they help with ripple current...
    cogging ~ down grade you filmware to 1.24
    I think it is...


    edit

    http://traxxas.com/forums/showthread...ded-Capacitors
    Last edited by 87 GN; 02-08-2013 at 02:10 PM. Reason: link
    Would you go flip my truck back over??

  11. #11
    RC Turnbuckle Jr.
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    the castle caps are 220 uf 50v and there's 4 of them
    i did the same! that's why i have permanent ringing in my ears!
    you could hit radio shack or an electronics store and build a cheaper set couldn't hurt!
    Last edited by 50togo; 02-08-2013 at 03:30 PM.

  12. #12
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    I have 2 X 35v 1000uf ZLH Rubycon caps. They work great.

  13. #13
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    220 uf??? Isn't that to low. Are you missing a number? @50

  14. #14
    RC Turnbuckle Jr.
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    there's 4 of them

  15. #15
    RC Turnbuckle Jr.
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    If you make one use 10 g wire and mount it closest to the esc as possible

  16. #16
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    Quote Originally Posted by zippogeek View Post
    I wonder if they would help with cogging...even on 4S, I still get moderate cogging (although I've also heard that cogging is more a function of sensorless ESCs than anything).
    Won't help with cogging. Cogging is caused by the fact the ESC doesn't know the position of the magnets on the rotor, so it takes the motor a few rpm's before it starts to turn in sync with which windings the ESC is sending power to.

    With sensored motors it knows where the magnets of the rotor is and sends power to the correct windings in order to get it going smoothly.

    ESC's like Tekin's RX8 start out sensored so they are smoother at low RPM but at higher RPM they don't bother with the sensor and operate the motor in sensorless mode to reduce EMI.

    Some one can correct me on the terminology but that's a basic.

  17. #17
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    87 is right, try firmware 1.24 for less cogging on take off.


    Sent from my iPhone 5

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