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Old 08-22-2008, 10:26 AM   #1
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Default pinion for tc4 - 6turn

Hi all,

I have a factory tc4 running the stock 72T 48 pitch spur. Just wondering, what type of pinion gear do I need for this setup with a 6 turn motor to achieve max speed?

Thanks
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Old 08-22-2008, 06:01 PM   #2
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maximum speed by running the car in a straight line for 200 feet, like in a drag race, or maximum speed on a road course with track barriers?
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Old 08-22-2008, 06:41 PM   #3
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I'll save the peanut gallery of this one. Gear it as big as you dare 'till it blows!
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Old 08-23-2008, 07:05 AM   #4
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I was thinking drag but i'm now second guessing it. Please recommend something for a course.

Thanks
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Old 08-23-2008, 08:15 AM   #5
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Just look for the biggest pinion and smallest spur... You don't really need suggestions, unless you're looking for suggestions on brands of spurs and pinions.

I hear Robinson pinions are great--go and get som 60 pitch spurs since there will be more of a selection.
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Old 08-23-2008, 01:48 PM   #6
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I just want to know what type of pinion I need for my spur gear running a 6 turn motor? How many teeth on the pinion?
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Old 08-24-2008, 06:29 AM   #7
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anyone know?
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Old 08-24-2008, 02:03 PM   #8
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between 16 and 20
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Old 08-24-2008, 02:04 PM   #9
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check the castle creation mamba max 1/10 th scale support page--they have a chart for the tc4 72spur.
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Old 08-24-2008, 08:33 PM   #10
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Sounds like you're going to bash. Really it doesn't matter... but you'll want to be safe and go with a low pinion gear number and a high spur gear number. Buy a few and try it out.

The reason why no one has answered your question specifically is because there is no perfect setup per turn of motor. You have to find out yourself. The problems you are going to run into are whether the car seems to have enough torque as you will like, and as much speed as you will like.

The lower the turns, the faster it is, but the lower the torque. To make up for lost torque, you gear the motor lower (smaller pinion, higher spur). If you do the opposite (larger pinion and higher spur) then your motor will have to work too hard, and can overheat. It's like trying to bike from a stop on 6th gear, as opposed to a lower gear. The 6th gear will be very hard, whereas 1st gear is really easy. You want to find the gearing that will give you enough torque and speed.

The only way you're going to do this is experimentation. Like Poochy said start with somewhere between 15-20T. I was running brushless 6900kV which is equivalent to around an 8 turn. I don't know how internal ratios are on the TC4, but on my Ta05, I ran 20T and 70T pinion and spurs respectively. You'll probably want to try to get 15-20T pinions to try out.

Hopefully this helps...let us know how it goes. Remember, a lot of RC as a hobby is experimentation
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Old 08-24-2008, 10:07 PM   #11
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TC4 FDR is 2.5
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