Go Back  R/C Tech Forums > General Forums > Electric On-Road
Motor gearing questions >

Motor gearing questions

Motor gearing questions

Old 08-21-2007, 09:01 PM
  #1  
Tech Regular
Thread Starter
 
larlee's Avatar
 
Join Date: Jun 2006
Posts: 364
Default Motor gearing questions

Hi all,
I have a question about brush motor.
example:
Tamiya Super Stock TZ 23T
instruction manual says gearing ratio is between 6.5 - 7.5

What does under gear or over gear means?
If I gear my TA05 to 5.9 with this super stock TZ, does it mean it is over gear? it gets very hot after 1 battery pack, does it means i am stressing the motor?
if i gear it to 8, will it be too much torque and it will also kill the motor?

Sorry, I got confused by different views. Can someone pls enlighten me?
Thanks.
larlee is offline  
Old 08-21-2007, 11:12 PM
  #2  
Tech Adept
iTrader: (10)
 
Join Date: Jan 2007
Posts: 162
Trader Rating: 10 (100%+)
Default

try gearchart.com they can explain that for you.
imel24 is offline  
Old 08-22-2007, 10:26 AM
  #3  
Tech Regular
Thread Starter
 
larlee's Avatar
 
Join Date: Jun 2006
Posts: 364
Default

Thanks.
I have tried to search for it,do I have to register in order to read it?
larlee is offline  
Old 08-22-2007, 03:48 PM
  #4  
Tech Adept
iTrader: (4)
 
Xray To The Max's Avatar
 
Join Date: Jun 2007
Location: Melbourne, Australia.
Posts: 175
Trader Rating: 4 (100%+)
Default

Originally Posted by larlee View Post
Hi all,
I have a question about brush motor.
example:
Tamiya Super Stock TZ 23T
instruction manual says gearing ratio is between 6.5 - 7.5

What does under gear or over gear means?
If I gear my TA05 to 5.9 with this super stock TZ, does it mean it is over gear? it gets very hot after 1 battery pack, does it means i am stressing the motor?
if i gear it to 8, will it be too much torque and it will also kill the motor?

Sorry, I got confused by different views. Can someone pls enlighten me?
Thanks.
Hey, ok the instruction manual knows best so i would reccomend sticking between 6.5 and 7.5 FDR for that motor. If you are currently running a FDR of 5.9 this means that you are overgeared. Overgeared means that the pinion gear has too many teeth on it and it is straining the motor and therefor heating it up! 5.9 isnt in the reccomended space of your instruction manual so this is why you are overheating. if you are running on a large track you want to go for a low FDR (final drive ratio). If you are running on a small track you want a High FDR to give you more acceleration. The higher the FDR the more acceleration the motor will have and and the lower the more top end speed it will have...but by having too much top end speed and not very good acceleration it isnt allowing the motor to rev freely and bogging it down as i said before. Undergearing is not usually a problem. For brushless if you majorly undergear them and they overrev down the straight the rotor in the motor can shatter. This is quite un-commen though. You want the most speed and acceleration around a track, so go to the track and start at a FDR of about 7. If your motor is cold after your 5 minute race (battery pack) you can go down in your FDR (more teeth on the pinion gear). You want your motor about luke warm when you feel it, it should not burn your hand, if it does go up in FDR (smaller pinion).

I hope this helps you,

Ragards, Ryan
Xray To The Max is offline  
Old 08-22-2007, 07:07 PM
  #5  
Tech Regular
Thread Starter
 
larlee's Avatar
 
Join Date: Jun 2006
Posts: 364
Default

Originally Posted by Xray To The Max View Post
Hey, ok the instruction manual knows best so i would reccomend sticking between 6.5 and 7.5 FDR for that motor. If you are currently running a FDR of 5.9 this means that you are overgeared. Overgeared means that the pinion gear has too many teeth on it and it is straining the motor and therefor heating it up! 5.9 isnt in the reccomended space of your instruction manual so this is why you are overheating. if you are running on a large track you want to go for a low FDR (final drive ratio). If you are running on a small track you want a High FDR to give you more acceleration. The higher the FDR the more acceleration the motor will have and and the lower the more top end speed it will have...but by having too much top end speed and not very good acceleration it isnt allowing the motor to rev freely and bogging it down as i said before. Undergearing is not usually a problem. For brushless if you majorly undergear them and they overrev down the straight the rotor in the motor can shatter. This is quite un-commen though. You want the most speed and acceleration around a track, so go to the track and start at a FDR of about 7. If your motor is cold after your 5 minute race (battery pack) you can go down in your FDR (more teeth on the pinion gear). You want your motor about luke warm when you feel it, it should not burn your hand, if it does go up in FDR (smaller pinion).

I hope this helps you,

Ragards, Ryan
Thanks Ryan. This really helps a lot.
larlee is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.