EP Car Gearing

Old 07-22-2002, 05:27 AM
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Default EP Car Gearing

Hi, how can I determine the factor to multiply to get the FDR?

Eg, I am using a 120/40 gearing, so

FDR = 120 / 40 * X

How to I determine X?
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Old 07-22-2002, 05:28 AM
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Anyone know what X (refer to previous post) is for the 1/10 Xpress Mini? Thanks.
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Old 07-22-2002, 05:32 AM
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What u mean FDR
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Old 07-22-2002, 05:58 AM
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Wah...I think the manual should have the final drive, check out the manual first. If not, count the no of teeth on the pulley and the diff pulley and then the wheel dia and then do this do that to get the final ratio heehe...sorry not very sure how to do it too...anybody here can help, Alvin, I'm sure you noe.
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Old 07-22-2002, 06:08 AM
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Spur gear X pinion gear / differential gear X center pulley
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Old 07-22-2002, 06:45 AM
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Since u guys are all on 04/414 chassis:

Transmission Ratio = 2.133:1 (Varies car to car)
Gear Ratio = Spur/Pinion, say for Type T my favourite FDR @ RCS is 120/40, or 3:1

Final Drive Ratio = Transmission Ratio x Gear Ratio, so 2.133x3 = approx 6.4:1 final drive ratio.

To find the transmission ratio, divide the number of teeth on your diff pulley by the teeth on the layshaft. 414/04 ball differential's pully has 32 teeth, the layshaft has 15 if I am not mistaken, so 32/15 = 2.133

Do correct me if I am wrong.

~Alvin
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Old 07-22-2002, 09:20 AM
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Thanks for all your replies..

ART2: Was checking my 414M manual after reading your post, there it was, that 32/15 thing! Doh!

Alvin: You are right!

Last edited by MosFat; 07-22-2002 at 10:22 AM.
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Old 07-22-2002, 09:29 AM
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Ok, so after fiddling around with the numbers, I've decided to put it down in a spreadsheet.. please let me know if there're any errors..



http://home.pacific.net.sg/~devonho/gearcal.xls

Last edited by MosFat; 07-22-2002 at 09:53 AM.
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