gearing question?

[GGASMAN]

ok guys my son thru a rod in my os 18tm this weekend in the A Main. so i bought me a new engine. what gearing should i use on this one.the track we run at has about a 60ft straight, then alot of turns and doubles, triple, and quads.

heres the motor i bought

http://cgi.ebay.com/traxxas-revo-rb...058699699QQcategoryZ44029QQrdZ1QQcmdZViewItem

 

[Monkey Wrench]

I'm not sure what gearing you should use, but I am running 16/36 with close-ratio gearing in the tranny with an OS .18TM.

If you'd like, I have a great Revo gearing chart I can e-mail ya, just PM your e-mail address and I'll shoot it right over!

 

[GGASMAN]

thanks. pm you now

 

[sly2136]

as a rule on gearing you want your truck to accelerate to about 3/4 of the longest straight on the track. the down side to your situation is if the longest straight is 60ft your gearing is going to be low geared and may cause the truck to do wheelies. with the motors you have picked the over rev's are really high on both so even if you under gear a little it won't hurt your top speed on that track any. other thing to keep in mind when changing gear ratio is you have to adjust the shiftpoint to make it work properly. i like to set mine up so it shifts 10ft or so out of a turn that way it pulls for all its worth. if it shifts to late your just reving the motor and not much movement