Go Back  R/C Tech Forums > General Forums > Electric On-Road
Gearing for Dummies. [HELP] >

Gearing for Dummies. [HELP]

Gearing for Dummies. [HELP]

Old 08-13-2005, 10:35 AM
  #1  
Tech Master
Thread Starter
iTrader: (10)
 
DustinR's Avatar
 
Join Date: Sep 2004
Location: Indianapolis, Indiana
Posts: 1,571
Trader Rating: 10 (100%+)
Default Gearing for Dummies. [HELP]

OK I have a HPI Pro 2 and a Losi XXX-S G+. I am wanting to get the final rollout on both of the cars to 112-115. Can anyone help me.

On my XXX-S I am running a 128 64 pitch spur.
On my Pro 2 I am running a 87 48 pitch spur.

I am running rubber tires that are 63mm in diamiter on both cars. I do not know the internal ratios of either car.

I do not want just an answer like run a 28 pinion altough that is also needed. I would like someone to explain how they came to their answer.

Thanks so much for any and all help. I plan to race these cars tomorrow.
DustinR is offline  
Old 08-13-2005, 10:47 AM
  #2  
Tech Elite
iTrader: (1)
 
Join Date: Nov 2002
Location: CORONA , CALIF.
Posts: 4,074
Trader Rating: 1 (100%+)
Default

try here www.gearchart.com ... you can calulate roll out youll need but you will need to enter your final for both cars as well ...
mb racer is offline  
Old 08-13-2005, 11:04 AM
  #3  
Tech Master
iTrader: (6)
 
Rob Phillips's Avatar
 
Join Date: Nov 2004
Location: Indianapolis / VA
Posts: 1,722
Trader Rating: 6 (100%+)
Default

You will need the following info to figure out your FDR or rollout

-what class/motor
-what is the track size
-is it tight or open layout

When I used to run a xxx-s on carpet w/foams I ran something like a 33/128 for stock. your tires ar a little bigger than my foams so you would proably want to gear it something like a 31 tooth pinion. this was on a tight layout and about a 90 foot straight.
use gearchart.com to find the internal ratio's and compute your rollout. I think you should be able to find out what to run when you get to the track. Just ask one of the fast guys, they should be able to help you or point you in the right direction.
Rob Phillips is offline  
Old 08-13-2005, 12:27 PM
  #4  
Tech Master
Thread Starter
iTrader: (10)
 
DustinR's Avatar
 
Join Date: Sep 2004
Location: Indianapolis, Indiana
Posts: 1,571
Trader Rating: 10 (100%+)
Default

Originally Posted by mb racer
try here www.gearchart.com ... you can calulate roll out youll need but you will need to enter your final for both cars as well ...
Ok, But now I have a question. I went to www.gearchart.com and entered the gearing. Worked cool but I wonder about the pitch. I run 64 pitch in xxxs and 48 pitch in pro 2. When I enter it in the chart I do not see a difference. Does someone have an idea of how to combat this.
DustinR is offline  
Old 08-13-2005, 12:47 PM
  #5  
Tech Master
iTrader: (1)
 
Join Date: Dec 2001
Location: Arizona
Posts: 1,197
Trader Rating: 1 (100%+)
Default

Originally Posted by DustinR
Ok, But now I have a question. I went to www.gearchart.com and entered the gearing. Worked cool but I wonder about the pitch. I run 64 pitch in xxxs and 48 pitch in pro 2. When I enter it in the chart I do not see a difference. Does someone have an idea of how to combat this.
There is no difference, Final Drive Ratio is the same regardless of 64 or 48 pitch. Only difference is the drive ratio of the transmission.
pops is offline  
Old 08-13-2005, 02:10 PM
  #6  
Tech Elite
iTrader: (1)
 
Join Date: Nov 2002
Location: CORONA , CALIF.
Posts: 4,074
Trader Rating: 1 (100%+)
Default

Originally Posted by DustinR
Ok, But now I have a question. I went to www.gearchart.com and entered the gearing. Worked cool but I wonder about the pitch. I run 64 pitch in xxxs and 48 pitch in pro 2. When I enter it in the chart I do not see a difference. Does someone have an idea of how to combat this.
just enter the info. and your done .. as said before there's no diffrence and gear charts program will have you dialed in ... 64 or 48 pitch ..
mb racer 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 -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.