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Sakura d3 cogging issues

Discussion in 'Race - Electronics' started by twizted2011, Feb 6, 2016.

  1. twizted2011

    twizted2011 New Member

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    im having some issues with cogging im running a toro 9t brushless with a 21t pinion gear and all stock gears

    question is will reducing the pinion stop this or should i go with a different size motor
     
  2. Y2daT

    Y2daT Over Powered RC
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    all brushless ( non sensored ) will cog at low rpm ... a lower gear ratio will help some
    after a fast run what is hotter the motor or the esc ?
    this will help to find proper gearing . a good gear ratio will have both about the same temp but not to hot .
    ... a 4pole brushless motor does not cog as much as a two pole .
    if you got the 60A combo you may be able to increase the start power to reduce the coging with the program card
     
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  3. twizted2011

    twizted2011 New Member

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    Thanks I did notice that the motor is hot
     
  4. Y2daT

    Y2daT Over Powered RC
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    did you check the esc temp at the same time?
    i need both temps to be sure but think you need to gear down to reduce the coging.
    also with the pinion gear removed check the rc's free roll ability ... if something is too tight or Binding . it can be the source of all your issues .... your motor is listed as a 3200 kv ( i think) so it should have a decent amount of torque to pull a 4wd drive train .
    .
    .
    the touch test is how i check temps ...it is not as accurate as a thermometer but gets the job done .
    be careful if you do it my way.
    but i simply touch the motor and esc and count 5 seconds ...... if i cannot make it to 5 it is to hot ...... and is in the danger zone .....
    .
    ive tried every gear ratio possibile on my t3 brushless rig and learned that With a good drive train .
    if geared to low the motor will be much hotter then the esc
    if geared to high the esc will be hotter then the motor ....
    when they are close to the same temp you are in the good range ..
    which varies between rc types ,mods and driving style ...
     
    #4 Y2daT, Feb 7, 2016
    Last edited: Feb 7, 2016
  5. twizted2011

    twizted2011 New Member

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    The motor gets untouchable
     
  6. twizted2011

    twizted2011 New Member

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    Esc is fine
     
  7. twizted2011

    twizted2011 New Member

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    I still have to turn up the punch on it but have to wait to get new lipos to do that
     
  8. Magnat007

    Magnat007 Proud SCX10 Owner
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    Are you running it on a track or just in the street ?
    Different tracks require different roll out figures to keep competitive.. Sadly this is at the expense of the motor... so it really depends on where your running it..
    If the area has alot of corners then a 9T is never going to reach optimum RPM and will always be drawing on the current making the motor hot.. a Change to say a 17.5T would be better for tighter and twister tracks and would allow the motor to get air cooled on the straights.
     

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