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Old 05-31-2006, 08:53 PM   #1
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Default ft tc4 gearing

ok i am new to rc racing and i don't know what pinion to put with my factory spur gear(i think that is is a 48P 72T spur) i have heard different opinions, so i don't know what to believe so i will ask some people that will know, i have a checkpoint 15X2 motor that we run on a medium length track with foams. can someone point me in the right direction. someone said that i should lose the 48p 72T spur and get another pitch so that it will be smoother, is this true?
Thanks
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Old 05-31-2006, 09:01 PM   #2
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don't know about the pitch issue, but i found that the graph at the back of the manual was almost spot on in relation to a starting point.

Just a matter of starting there and moving up or down depending on what you need and the conditions.
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Old 06-01-2006, 09:19 AM   #3
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or you can go to gearchart.com
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Old 06-01-2006, 11:01 AM   #4
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Don't worry about the pitch, 48dp is absolutely fine and changing wouldn't benefit you much. It depends a lot on your individual track, motor etc as to exactly what pinion you run. On a medium length track, probably something between 24-28t would be a good starting point.

Ask other drivers at your club what gear ratio they use. You can work out your tc4 ratio by doing: (teeth on spur/teeth on pinion)*2.5. The 2.5 bit is the 'internal ratio' on the tc4 that is created by the different sized gears in the transmission cases. A smaller pinion will give you a higher number gear ratio, and will increase the cars acceleration, but lower the top speed.

HTH,

Ralph
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Old 06-01-2006, 04:59 PM   #5
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Cool opion on pinon

i run like a 28,29 depending on track size ? 48p is fine, takes more of a beating.... lmao
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Old 06-01-2006, 05:46 PM   #6
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it is a medium track, but it changes everyweek from a medium to short then shot to medium track, any brands suggested?
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Old 06-02-2006, 03:05 AM   #7
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Quote:
Originally Posted by andy_b22
any brands suggested?
If you mean pinions, they're all pretty similar. You wont notice the difference between a cheap and expensive 48dp pinion, any weight difference is minimal.
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