Originally Posted by shikakae123
Base on what you say,it means that if i am using a 70T spur gear,then i should use a 25 T pinion?Since the gear ratio is 5.75:1
When you say gear ratio, do you mean the internal gear ratio or final drive ratio?
It comes down to what you want your car to do, do you prefer acceleration or top end speed? There are limits to how high or low you can go depending on your motor. I am unsure of if it makes a big difference changing the gear ratios at the pinion, center or diff pulleys. I like mine around 8 or 9 as i like high acceleration, suits my track and style.
basically to calculate your FDR it works like this;
Spur teeth divided by pinion teeth = Primary Drive ratio (A)
Diff pulley divided by center pulley = Internal Gear Ratio (B)
the A times B = Final Drive ratio
so my Ta05v2 works like this;
70/18 = 3.888888
36/16 = 2.25
3.8888*2.25 = 8.75:1
if wanted a higher top end speed setup i do this;
70/18 = 3.8888
36/18 = 2 <----i change the center pulley to an 18t
FDR = 7.77777:1
or you can get a pinion with more teeth and get higher top end or less teeth and get more acceleration.
are they the same calculations that you are using for the 5.75:1 ratio?
does that help? it all confused the hell out of me to start with, mainly because of the whole anti-n00b wording on such matters, but its easy once you get it.