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Old 08-20-2008, 09:45 PM   #1
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Default Factory Team TC4 and MM 7700 pinion question?

Hey guys,

Electric newbie here. I'm buying a factory team tc4 and I will be using a Mamba Max 7700 system in it. What pinion do you guys reccomend as a good starting point and will be safe on the motor-wont overheat it? The track I run is, I guess, a normal size track on the parking lot.

Thanks
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Old 08-20-2008, 10:02 PM   #2
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on that car i think you want to run something near a 8.5 fdr. i dont know the spur on that but this will show you how to find the correct pinion.

lets say you have a 88t spur and a 44t pinion. and maybe a 2.25 internal gear ratio. it goes... 88/44x2.25 which equals 4.5 fdr. (my car)

on the rtr tc4 it has a 2.5 internal gear ratio to get you started. now you would want to aim for a 8.5 fdr (based off a 7,400kv motor). figure out the spur and then you will be ready to roll.
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Old 08-20-2008, 10:29 PM   #3
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its a stocked 72t spur gear
i am not sure what the gear ratio is but everything is stocked for a Factory Team TC4

i used your formula and came up with 21.17.

what do you think?
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Old 08-20-2008, 11:01 PM   #4
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ill do some math on the calculator...

72/21x2.5= a little over 8.5. so id start with a 21t pinion but this is based off a 7,400kv motor. so i'd give or take a few teeth. dont go over 180F in heat or if you dont have a heat gun, see if you can hold your two fingers on the motor for 5 seconds or so.
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Old 08-21-2008, 08:10 AM   #5
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thanks a lot man!
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Old 08-23-2008, 09:31 AM   #6
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Just for clarification--since I have a 14t pinion here with me. Will a 14 be safer (less likely to overheat) than a 26t pinion? I assume 14 is better acceleration and 26 is higher top end-higher top end makes the motor work harder and more prone to overheat? Thanks.
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Old 08-23-2008, 02:13 PM   #7
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I run my 7700 at 9.7 with 6000 LIPO on a big track with 160 foot straits with rubber tires. At 8.8 it gets to hot in hot weather but it's OK on cool days. So your 14t pinion should be fine to start with. You should get a temp gun, that is the only way to gear any motor right.
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