savage21 brushless conversion
 

hi guys need your help yet again ,,:lol: converting this nitro savage 21 to brushless have most things sorted thanks to this forum confused on gearing i have the stock two speed transmission lockd in second gear . with a 47 tooth spur gear mod1 , also have a mod1 13 tooth pinion . not sure if this is correct ???????? need your input will be running 4s and 6 s best gearing options plz guys .. some have said go to a 17 tooth pinion ??? small pic of this savage thanks . http://i406.photobucket.com/albums/p...Picture102.jpg http://i406.photobucket.com/albums/p...Picture103.jpg http://i406.photobucket.com/albums/p...Picture101.jpg :oops:

I like your gear cover. Dough!

:rofl::rofl::rofl: yes made from my kidds play dough pot .lol.. thanks :na:

Looks good so far. What ESC and motor are you using? Also what motor mount are you using? I just converted a Savage X without a transmission, So I'm not much help on gearing. Maybe the masters Finnster or Jthiessen will chime in on gearing. Will you be using Flux Lipo trays?

ok this might help .. http://www.ultimaterc.com/forums/sho...d.php?t=105970

the brushless system is the 150 amp exrun combo i have two of these systems and find them great the kitt is from speed passion motor mount and batt trays to be honest not worth the money , your better of with r/c monsters motor mount thanks

If you tell us the motor kv we can tell you what gearing to use...

that's a hobbywing xerun 4274sl, it is 2000kv.

A 13 tooth pinion puts you at 42mph on 6s and 28mph on 4s. That sounds perfect to me as a starting point. Temperarure of the electrical components is what you need to know to determine ideal gearing for any brushless setup.

Gearing a monster truck for about 40mph is an excellent starting point for determining proper gearing.

I got the mph figures by using BrianG's speed calculator. He is a moderator here at RCM and has developed an invaluable tool for the r/c hobbyist. It is an easy to use tool with drop down menus for inputting your parameters. It is found in a sticky titled "speed calculator" in the brushless section.

Using it you will never have to wonder about gearing again, here's a link to it:

http://www.scriptasylum.com/rc_speed/_top_speed.html

thank you so much that calculator is great also much appreciated :yipi: