EP Car Gearing
07-22-2002, 05:27 AM
#1
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?
Eg, I am using a 120/40 gearing, so
FDR = 120 / 40 * X
How to I determine X?
07-22-2002, 05:28 AM
#2
Anyone know what X (refer to previous post) is for the 1/10 Xpress Mini? Thanks.
07-22-2002, 05:32 AM
#3
Tech Adept
What u mean FDR
07-22-2002, 05:58 AM
#4
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.
heehe...sorry not very sure how to do it too...anybody here can help, Alvin, I'm sure you noe.
07-22-2002, 06:08 AM
#5
Tech Adept
Spur gear X pinion gear / differential gear X center pulley
07-22-2002, 06:45 AM
#6
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
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
07-22-2002, 09:20 AM
#7
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!
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.
07-22-2002, 09:29 AM
#8
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
http://home.pacific.net.sg/~devonho/gearcal.xls
Last edited by MosFat; 07-22-2002 at 09:53 AM.
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