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Old 10-27-2012, 07:55 AM   #1
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Default Need help with understand KV ratings on motors

Im getting my electric stuff together for winter racing and im trying to figure out a motor for truggy. Right now I have Tekin 1900kv in buggy and 4600kv in SCTE. Im sticking with Tekin, I just want to know what the KV ratings are for. I like power but I want it to be controllable and strong. Most likely ran on 4S.

Any responses on KV ratings is appreciated.
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Old 10-27-2012, 02:06 PM   #2
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Do anybody know something?
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Old 10-27-2012, 02:10 PM   #3
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For 4s use, i'd say 2000 to 2200. 5s on 1550kv or 6s on 1350kv would be more efficient, torquey, have longer runtimes and would have a lot lower temps though.
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Old 10-27-2012, 09:17 PM   #4
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Easiest way to explain it is this. The higher the kv number the faster the motor turns. For example if you have a 2200kv motor and a 2650kv motor and you run them on 4s. The 2650 will spin faster. Problem is the higher the kv rating lower the voltage it can handle. so the 2200kv can handle up to 6s where as the 2650kv can only handle up to 4s. Most people like to run a lower kv motor with a higher volt battery because it is more efficient. Motor will run cooler and battery lasts longer. Mess around in scriptasylum.com to see how different kv motors and battery volts effects the final top speed. Then pick a motor and battery combo that gets the top end speed that suits your track best. Also pinion and spur gear size changes your speed alot but im sure you know that.
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Old 10-28-2012, 12:00 AM   #5
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KV just means RPM/volt. so a 1900 KV motor will have a peak unloaded rpm of 47880 with a fully charged 6s 25.2v battery. gennerally for 1/8 truggy you are going to want a motor in the 1500-2500kv range But I like to be right around 1800kv-2200kv. Higher kv motors run faster on the same voltage but will also get hotter faster than lower kv motors. Lower kv motors will run cooler and have more torque but will not produce the same rpm. Its all about finding the right balance.

You will find the smaller the scale the higher the kv ratings will be for their respective motors. for example for a 1/10 4wd truck you will see motor ranging from 3000kv-5500kv. For 1/18 scale trucks you might see motors in the 5000kv-10500kv range. Generally speaking the heavier the vehical in question is, the lower the kv rating on the motor should be.
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Old 10-28-2012, 03:34 PM   #6
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Thanks for replying and good info. I am on the fence of going with tekin 2250kv(or maybe 2000kv) with 4s for my truggy.
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Old 10-28-2012, 07:36 PM   #7
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Quote:
Originally Posted by Reubster24 View Post
Easiest way to explain it is this. The higher the kv number the faster the motor turns. For example if you have a 2200kv motor and a 2650kv motor and you run them on 4s. The 2650 will spin faster. Problem is the higher the kv rating lower the voltage it can handle. so the 2200kv can handle up to 6s where as the 2650kv can only handle up to 4s. Most people like to run a lower kv motor with a higher volt battery because it is more efficient. Motor will run cooler and battery lasts longer. Mess around in scriptasylum.com to see how different kv motors and battery volts effects the final top speed. Then pick a motor and battery combo that gets the top end speed that suits your track best. Also pinion and spur gear size changes your speed alot but im sure you know that.
Reubster....thanks for your post! I went to scriptasylum.com. There is a wealth of tech on there! Jimmy
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Old 10-28-2012, 07:48 PM   #8
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Quote:
Originally Posted by mikesd1980 View Post
Thanks for replying and good info. I am on the fence of going with tekin 2250kv(or maybe 2000kv) with 4s for my truggy.
Make sure you buy the truggy specific motor... Tekin makes the motors in both buggy and truggy sizes. same Kv rating, but the truggy cans have a bit more torque.

I run a Tekin T8 2650kv in my SCTE. I know its overkill to some extent, but the flexibility for gearing and Lipo combinations is a big plus...
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Old 10-28-2012, 08:58 PM   #9
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Quote:
Originally Posted by Fletch7276 View Post
Make sure you buy the truggy specific motor... Tekin makes the motors in both buggy and truggy sizes. same Kv rating, but the truggy cans have a bit more torque.

I run a Tekin T8 2650kv in my SCTE. I know its overkill to some extent, but the flexibility for gearing and Lipo combinations is a big plus...
I didn't know it could fit.
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Old 10-29-2012, 12:47 AM   #10
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Originally Posted by Rockthecatbox21 View Post
I didn't know it could fit.
If you are referring to the Tekin T8 in the SCTE... yep, it fits. no trouble at all.
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Old 10-29-2012, 06:36 AM   #11
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I knew they had different motors for truggy and buggy. The numbers are simuliar but not the same except for the 1700kv.

T8 Motors
T8 (buggy) motors
TT2350 4030 2650kv
TT2351 4030 2050kv
TT2352 4030 1900kv
TT2353 4030 1700kv
TT2354 4030 1400kv

T8 (truggy) motors
TT2360 4038 2250kv
TT2361 4038 2000kv
TT2362 4038 1700kv
TT2363 4038 1550kv
TT2364 4038 1350kv
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Old 10-29-2012, 08:59 AM   #12
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Default kv

just a little input... i run rx8 and t8 1900kv in 1/8 buggy, rx8 and t8 2000 in 1/8 truggy both on 5600 60c 4s and 4wd sc either a pro 4 4000 or 4600 depending on how fast u wanna go. I personally run a 4000kv and it is plenty fast for my local indoor track. sometimes almost to much hope this helps
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