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Thread: Gearing Help with 3900KV motor

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Old 09-21-2009, 05:04 AM   #1
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Default Gearing Help with 3900KV motor

I ordered a Turnigy/EZRun 60 amp ESC and EZRun 3900KV (10T) motor combo. I need some help to sort out gearing before it arrives. I have the stock 18/87 RTR gearing right now. What should I run with the brushless?
Do I need the 75 tooth spur like the kit comes with?
Please let me know what you have had success with.

Thanks
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Old 09-21-2009, 09:54 AM   #2
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I say your close, now it depends on your running area.

Get a 16, a 17 and a 19 maybe a 20-21 if where your running it is smooth and wide open.

16 if it's rough and or tight area, 20 would be smooth and open.

I'm running 18/87 with the 3500 vxl motor. Plenty fast, good torque. Track I went to is not to tight so gearing was great.
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Old 09-21-2009, 01:39 PM   #3
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Really? That sounds kinda low. I was running 22/81 on my VXL and it stayed cool, even after 20 minutes of HARD running. This was bashing in a pretty open area though...might drop it a little for the track. I've actually geared it up for now though...24/81. Haven't tested it yet, but I expect it to work well. I dunno if I'll like it as much, but I figure I might as well try it since 22/81 didn't get the ESC or motor very hot.
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Old 09-21-2009, 01:53 PM   #4
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I am runnin a ezrun 13t, and I have mine at 17/87. It gets a little warm, but nothing to be worried about.
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Old 09-21-2009, 02:29 PM   #5
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Quote:
Originally Posted by timberline97 View Post
I am runnin a ezrun 13t, and I have mine at 17/87. It gets a little warm, but nothing to be worried about.
How long has this motor lasted you so far?
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Old 09-22-2009, 08:14 AM   #6
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Quote:
Originally Posted by dpdsurf View Post
How long has this motor lasted you so far?

Well, honestly, I just got it about a month ago. I have ran it 2 or 3 times at the track.. and a handfull of times in front of the house.
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