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  1. #1
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    School me on KV ratings?

    Ive been looking at different motor/esc options. I was at the lhs and owner told me the higher the kv the faster you will go? One of his kits had a kv rating of 6400 and another at 7400. Now when I search through forums it seems most people are running a 3s on lower kv motor. I don't want to purchase a setup if I cant run both 2s and 3s???

  2. #2
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    In a sense, yes... the higher kv the faster you will go; but there is a large trade off... the more kv you have the less torque the motor is capable of, which can lead to nasty heat issues.

    kv = rpm per volt
    Whatever it is I just said... I could be wrong.

  3. #3
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    Ah thanks

    After a little more research I think Ive got it figured. Basically high KV on a 4x4 monster truck with 3s will cause the esc to overheat, which is why the biggest choice for a motor/esc upgrade on a 4x4 monster truck is between 2200-2400KV due to its weight, bigger tires and 4x4 system.

  4. #4
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Yup!!

    Higher kv can work... but after all the hassle and expense of figuring out what will work; it is cheaper to buy a tried and true system.
    Whatever it is I just said... I could be wrong.

  5. #5
    RC Turnbuckle Jr. Petertje60's Avatar
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    Bear in mind that only the Kv rating on itself doesn't tell you if a motor is able to get your car ahead without overheating.
    A 2200Kv 200W motor will get hot in no time while a 6000Kv 3000W motor will never get hot in a 4x4 Pede.

    For motors of the same size and the same rotor size, the rule of thumb "higher Kv = less torque, more rpm at the same voltage" is valid.
    Nobody is born with experience.

  6. #6
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    I've got a 2200kv motor and MM@ and I've been bashing hardcore since I got mine and I'm running this setup thru tall grass and heavy terrain like high hills/steep climbs and hasn't gotten above 120 degrees.

  7. #7
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    In this truck, I would say anything under 3000 kV is good and should be a 4 pole motor. I had an 1800kv 1/8 scale that was a 2 pole and it heated up real quick with conservative gearing on 3S.

    Sent from my phone.

  8. #8
    RC Turnbuckle Jr. Petertje60's Avatar
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    Quote Originally Posted by Slaughter33 View Post
    In this truck, I would say anything under 3000 kV is good and should be a 4 pole motor. I had an 1800kv 1/8 scale that was a 2 pole and it heated up real quick with conservative gearing on 3S.

    Sent from my phone.
    That is exactly what I meant. This 2 pole 1800 is apparently not powerful enough. I'm sure there are many 3000Kv+ (for example the Castle 1410 series) motor users which are happy with it. There are even enough people happy with the stock combo.

    Power demands are personal. I see a trend that people with several years of experience tend to go for controllable power.
    Nobody is born with experience.

  9. #9
    RC Turnbuckle Jr. rag6's Avatar
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    ^^^ yup!...
    Sit down, buckle up, hold on, pay me...

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