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Old 09-08-2003, 08:07 PM   #1
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Default Futaba Plug melting, ESC Qs

I'm having a bit of a problem with my car-

I'm running a 17 turn mod motor with a 7 cell 3000mah NIMH pack. My ESC is a Duratrax Spike for 5-7 cells. (Info here:
http://www.hobbiesr.com/dtx/dtx-esc/dtxm1040.htm )

It says it is only for 27turn stock motors on one site.

Does the gear ratio really matter in terms of the ESC connections overheating? I have a 23T/78T ratio on a 2.65? reduction.

My main problem is that the car ran like a champ for about 30 seconds of full throttle. Then the connection between the battery pack and the ESC melted up. The positive wire connection got hot in the plug, and melted the plastic. I pried it apart, ran again cautiously, and it did it again, this time the positive wire of the ESC actually came out of its socket. The ESC is functioning normally otherwise (overload protection does not kick in, to my knowledge).

If I upgrade to another ESC, how will I know the plug wires won't melt again? Any recommendations on a cost effective solution? Any replies greatly appreciated.

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Old 09-08-2003, 10:58 PM   #2
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well, you should get a motor that your esc can handle, then change the plugs to low resistance ones such as deans ultra plugs. or get an esc with no motor limit so you can use any motor you like.
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Old 09-08-2003, 11:48 PM   #3
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The white plastic battery conector is usually known as a
"Tamiya" plug in the RC world ... aka JST connector outside.

You have to keep them clean and crimped tight, and they
can handle surprisingly high currents. The pins should also
be soldered onto the wires, not just crimped.

But yeah, most users just don't bother and with neglect their
resistance will increase enough to overheat the whole assembly.

You have to either decide to learn how to maintain the JSTs, or
change everything you own to Deans, Powerpoles or similar.
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