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Old 12-18-2008, 06:39 PM   #1
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Default Gear Ratio's - Need some Math Help

Ok, so I am trying to figure out my final gear ratio and all those other gear ratios, so I can input them into my data logger...

Here is what I have so far.

Spur Gear - 44T
Pinion Gear - 13T
For a Primary Drive Ratio: 3.38

Front / Rear Diff Ratio: 4.30

Final Drive Ratio: 14.53

This is in a RC8e... Stock front/rear diff gears.

Does this look right?
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Old 12-19-2008, 08:26 AM   #2
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Looks right to me
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Old 12-19-2008, 08:30 AM   #3
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You need to get ahold of Tonys screws, he has a sweet gearing calculator that will do everything you need.
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Old 12-19-2008, 08:42 AM   #4
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how do you figure out gear ratio's???
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Old 12-19-2008, 08:47 AM   #5
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divide the big number by the little number.
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Old 12-19-2008, 08:59 AM   #6
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Quote:
Originally Posted by badassrevo View Post
You need to get ahold of Tonys screws, he has a sweet gearing calculator that will do everything you need.
I need to do this... is there a link?
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Old 12-19-2008, 09:05 AM   #7
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whats the big number and whats the little number? When you divide those two you get a decimal, what is that number?
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Old 12-19-2008, 09:09 AM   #8
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Quote:
Originally Posted by TNS Racing View Post
whats the big number and whats the little number? When you divide those two you get a decimal, what is that number?
It's like this -
Spur / pinion = primary drive ratio

front/rear diffs - Big gear / Little gear = Diff Ratio

You take the Primary Drive Ratio * Diff Ratio = Final Drive Ratio

So in my case...

44/13 = 3.38
F/R ratio = 4.30
Final Drive Ratio - 3.38 * 4.30 = 14.53
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